Tektronix 80A07 Electrical Clock Recovery Module
Contents
1. 1 275 MHz Peaking 0 3 dB max 4x Fibre Channel Bit Rate 4 25 Gb s Loop Bandwidth 2 55 MHz Peaking 0 3 dB max 1 8x Fibre Channel Bit Rate 8 5 Gb s Loop Bandwidth 5 1 MHz Peaking 0 3 dB max 8x OIF CEI 6G Bit Rate 6 25 Gb s Loop Bandwidth 3 6 MHz Peaking 0 1 dB max OIF CEI 11G Bit Rate 11 0 Gb s Loop Bandwidth 4 MHz Peaking 0 1 dB max OIF CEI 11G Bit Rate 11 0 Gb s Loop Bandwidth 6 MHz Peaking 0 1 dB max it OIF CEI 11G Bit Rate 11 0 Gb s Loop Bandwidth 8 MHz Peaking 0 1 dB max Serial ATA Gen 2 fbaug 500 Bit Rate 3 0 Gb s Loop Bandwidth 6 MHz Peaking 2 1 dB Serial ATA Gen 2 fhaud 1667 Bit Rate 3 0 Gb s Loop Bandwidth 0 9 MHz Peaking 0 dB SONET OC 48 SDH STM 16 Bit Rate 2 488 Gb s Loop Bandwidth 1 MHz Peaking 0 dB 1 l SONET OC 192 SDH STM 64 Bit Rate 9 95 Gb s Loop Bandwidth 4 MHz Peaking 0 dB XFP XFI Bit Rate 10 5 Gb s Loop Bandwidth 8 MHz Peaking 0 1 dB max 80A07 Clock Recovery User Manual Fully Buffered DIMM II Bit Rate 6 4 Gb s Loop Bandwidth 11 MHz Peaking 0 5 dB PCI Express II Bit Rate 5 0 Gb s Loop Bandwidth 5 MHz Peaking 1 dB max 15 Reference Table 3 Standards supported Standar2. Typical phase lock loop PLL characteristics are specified in terms of the 3 dB bandwidth of the recovery loop the rate of rolloff of the frequency response and the degree of response peaking allowable The 80A07 measures and displays the PLL frequency response from 100 kHz to 12 MHz The 80A07 allows full control of parameters including loop bandwidth LBW peaking damping and rolloff Design and test engineers can now find and lock onto signals of undefined or unknown data rates The engineer can recover full rate clocks including spread spectrum clocks for signals at data rates from 100 Mb s to 12 5 Gb s The engineer has full control of key parameters for variable loop bandwidth peaking damping and first and second order rolloffs optimizing jitter tracking Many test standards require the use of a Golden PLL phase lock loop To assure repeatability most serial data compliance test standards specify the PLL characteristics for jitter measurement Each standard provides an optimum LBW setting for clock recovery often called the Golden PLL The 80A07 has been designed to provide users with flexibility and accuracy in compliance measurements It is ideal for optical test applications like 4x 8x Fibre Channel and 10G Ethernet standards where the signal under test must be split off and converted from optical to electrical before being fed into the clock recovery data input The 80A07 recovers a full rate clock up to 12 5 Gb s an im
3. at 800 mVpp input 10 Gps 1010 pattern 2 MHz BW 0 5 dB peaking 70 fsec 250 fsec 15 dB minimum 80 20 point measurements 25 ps 30 ps APC 3 5 50 Q DC Full rate divided by 1 2 4 5 6 7 8 9 10 12 14 16 18 20 24 25 28 30 32 35 36 40 42 45 48 49 50 54 56 60 63 64 70 72 80 81 90 100 108 112 120 126 128 140 144 160 162 168 180 192 196 200 216 224 240 252 256 280 288 320 324 336 360 384 392 432 448 504 512 576 648 Odd division ratios have non 50 duty cycles Adjustable 250 MVpp 900 MVpp 10 or 30 mV Measured at div by 1 typically 25 for all division ratios 5 Ul Measured at div by 1 2 4 8 16 32 64 128 RMS at divide by 1 800 mVpp input 10 Gps 1010 pattern 2 MHz BW 0 5 dB peaking 70 fs 250 fs 15 dB 100 KHz to 12 5 GHz 80 20 point measurements divide by 1 25 ps 30 ps 80A07 Clock Recovery User Manual Specifications Table 4 Characteristics cont Specifications Control interface Type Uplink ports Additional ports Clock recovery response Loop bandwidth Minimum Maximum Frequency rolloff Minimum Maximum Peaking Minimum Maximum Frequency range Minimum Maximum Frequency deviation Bandwidth deviation Peaking deviation Measured edge density deviation Phase error output Connector type Impedance Coupling Frequency Track Output Connector type Impedance Coupling Characteristics USB 2 0
4. 1 3 Refer to graph for allowable data rate versus loop bandwidth combination settings Adjustable 100 KHz 12 MHz Adjustment of peaking also adjusts the frequency switchover point between low frequency 40 dB decade rolloff rate and high frequency 20 dB decade rolloff rate 20 dB dec 40 dB dec Adjustable 0 dB 6 dB Adjustable 100 Mbps 12 5 Gbps 500 5500ppm 0 05 0 55 30 33 KHz Modulation Rate 2 Measured with 1100 pattern at room temperature over 500 kHz to 12 MHz BW setting Increased deviation for BW settings below 500 KHZ 10 of setting or 0 2 dB 1 Linear Volts Ul of phase error depends on edge density and is not calibrated Bandwidth limited SMA 50 Q DC Volts PPM of frequency variation e g 5000 PPM gives 5 Vpp is not calibrated SMA 50 Q DC 80A07 Clock Recovery User Manual 21 Specifications Table 4 Characteristics cont Specifications Characteristics Trigger input External CR lock request Connector type SMA Impedance 50 Q Coupling DC to 0 volts Threshold 15V Pulse width 50 ns minimum Trigger output External lock status indicator Connector type SMA Impedance 50 Q Coupling DC Latency 300 ms maximum Table 5 Power consumption fuses and cooling Specifications Characteristics Source voltage and frequency 100 VAC to 240 VAC at 50 Hz to 60 Hz Fuse rating 3 15 A Power requirements 150 W maximum Table 6 Mechanical Specifications Characteristics Weight 20 I
5. AUX FREQUENCY TRIGGER TRIGGER DDS PHASE TRACKING IN OUT OUT ERROR OUT 3 5V MAX OUT O EPIA 1 2 3 RS232 USB HUB OUT Power button Tektronix 80A07 BERTScope CR ua DATA Ma DATA CLOCK INPUT IVpp OUTPUT OUTPUT C AVOID C ELECTROSTATIC DO NOT APPLY SUBRATE vaa mamae Peer chock 0 U eal L_ VOLTAGES LOCK ESC lt gt ENTER X u Figure 1 Installation Electrostatic Discharge 80A07 Clock Recovery User Manual To prevent electrostatic damage follow the precautions described in this manual and in the documentation provided with any connecting instruments Circuitry in the instrument is very susceptible to damage from electrostatic discharge or from overdrive signals Be sure to only operate in a static controlled environment Be sure to discharge to ground any electrostatic charge that may be present on the center and outer connectors of cables before attaching the cables Getting Started Static Controlled Workstation Know your signal source If it is capable of delivering overvoltages it is safer to not depend on the signal source settings for protection but instead use an external attenuator that protects the input from the worst case conditions For example for a 10 V maximum source connected to a 1 V maximum input use a 10X attenuator Where possible connect your cables to the signal
6. a sub multiple of the main clock output The 80A07 utilizes a user programmable divider for this purpose The divider is specifically designed to minimize the addition of jitter to the recovered clock signal This sub rate clock output can be used to precisely divide a clock down to a sub multiple frequency The 80A07 80A07 Clock Recovery User Manual 13 Reference User Interface Standards Coverage 14 provides a large selection of division ratios ranging from 1 to 648 To use the clock recovery instrument as a precision clock divider you would set the clock frequency to the actual input frequency and the edge density to 100 Then select the desired division ratio for the SUBRATE CLOCK output Note that because the divider circuits are located outside of the PLL the calibrated loop characteristics and jitter transfer function will scale in frequency by the sub rate divisor The 80A07 can be used in standalone operation or in conjunction with a Tektronix sampling oscilloscope As a standalone instrument information is always immediately available on the front panel display showing parameters such as the PLL bandwidth lock status bit rate peaking and rolloff For easy verification of compliance the correct characteristics are automatically set when a given standard is selected from a pull down menu However full control of parameters is possible with direct entry of the user parameters The 80A07 has variable jitter peak
7. bes ORAL UG Variable Clock Recovery armor DO NOT APPLY SUBRATE 150Mbps 12 5Gbps DISCHARGE CLOCK J J LOCK Esc p ENTER QA 7 O Ground for Lock button Press to Left and right Enter button antistatic initiate manual locking cursor buttons Scroll through menus strap Lock range min Change digits when editing 10 MHz max 500 MHz Select settings for adjustment Lock status indicator Escape button Exit Confirm editing changes E Green locked submenus and revert E Amber locking to previous values E Red unable to lock Measured values Device settings Cc Ni ae N 10 0002 GHz Standard EdgeD PhErr PhErms Nom Freq 10 000 GHz 48 5 5 1 0 5 Range 20 000 MHz EA LOCKED Loop Bw 6 000 MHz Peaking 0 000 dB eCLK e SUB ODDS OUSB LockMode AUTO L J Y Status indicators Figure 2 80407 front panel and display 80A07 Clock Recovery User Manual Getting Started Edge Density The instrument measures and displays the average edge density of the input data Device Settings Nominal frequency of the data input signal loop bandwidth and peaking up to 6 dB are configurable on the front panel display Phase Deviation The clock extraction circuit produces a phase difference between incoming data and CR clock output The phase deviation is displayed in peak peak and RMS 3 AN Y Feit Tie oe l 1010002 GHz Standard ees PhErms Nom Freq 10 000 GHz 0 5 R
8. pole Spread Spectrum Clocking Yes Optional Receiver Test 65 ps pk pk swing 1 8 MHz for most tests for ITU applications BW 1667 other Minimum of 4 MHz for stress testing in one case 2 Gen 1 amp 2 categories i internal hard drives etc and m medium reach use fpaug 500 and fpaug 10 for Gen 2 and 250Ul and 5Ul for Gen 1 x extended reach uses fyauq 1667 Type 2 Peaking bandwidths Implied specified as damping factor of 0 707 min to 1 00 max conversion taken from Gardner Loop bandwidths specified with transition density of 1 100 or 1010101 pattern Assumption is that loop bandwidth will change proportionally as transition density reduces 3 Specified as damping factor of 0 707 min to 1 00 max conversion taken from Gardner Loop bandwidths specified with transition density of 1 100 or 1010101 pattern Assumption is that loop bandwidth will change proportionally as transition density reduces 80A07 Clock Recovery User Manual 17 Reference Loop Bandwidth MHz 6 0 2 4 6 8 10 12 14 Date Rate Gb s The 80A07 has a variable loop bandwidth from 100 kHz to 12 MHz The calibrated loop bandwidth is limited as indicated by the graph Figure 6 Clock recovery loop bandwidth versus data rate 18 80A07 Clock Recovery User Manual Specifications AAA CS Specifications Electrical Sampling Modules This section contains specifications for the 80A07 E
9. 80A07 Electrical Clock Recovery Instrument User Manual FOUCAULT A ON Tektronix 071 2195 02 Y 80A07 Electrical Clock Recovery Instrument User Manual www tektronix com Tektronix 071 2195 02 Y Copyright O Tektronix All rights reserved Licensed software products are owned by Tektronix or its subsidiaries or suppliers and are protected by national copyright laws and international treaty provisions Tektronix products are covered by U S and foreign patents issued and pending Information in this publication supersedes that in all previously published material Specifications and price change privileges reserved TEKTRONIX and TEK are registered trademarks of Tektronix Inc Contacting Tektronix Tektronix Inc 14200 SW Karl Braun Drive P O Box 500 Beaverton OR 97077 USA For product information sales service and technical support In North America call 1 800 833 9200 Worldwide visit www tektronix com to find contacts in your area Warranty Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one 1 year from the date of shipment If any such product proves defective during this warranty period Tektronix at its option either will repair the defective product without charge for parts and labor or will provide a replacement in exchange for the defective product Parts modules and replacement products used by Tektronix for warranty work may be new o
10. PLL response and the jitter transfer function and display a plot of these to the user This can be useful to understand the relationship of these parameters at the particular data rate Many test standards require the use of a Golden PLL phase lock loop The 80A07 is an instrumentation grade clock recovery system The PLL parameters of clock frequency loop bandwidth and peaking are accurately calibrated and adjustable by the user This is useful in two situations during transmitter testing when the user wants to measure parameters in the data signal through the channel exactly as the receiver would and for standards compliance testing Because the clock recovery system removes the low frequency jitter from the regenerated clock the loop parameters must be calibrated and set to known values for repeatable jitter measurements To assure repeatability most serial data compliance test standards specify the PLL characteristics for jitter measure ment A PLL which is set to these specified parameters is often referred to as a Golden PLL The logic state of NRZ data does not change between successive bits of the same logic state Therefore there will not be a logic edge in every bit time slot or Unit Interval The edge density refers to the average percentage of unit intervals which contain a transition A repeating 1010 pattern has a transition occurring during every unit interval and therefore an edge density of 100 A Pseudo Rand
11. ange 20 000 MHz E ra a Loop Bw 6 000 MHz pone Peaking 0 000 dB eCLK SUB ODDS OUSB LockMode AUTO Xx v y Standards 24 preprogrammed industry standards available via the front panel interface Custom settings can be programmed and saved Figure 3 80407 display details AC power connector USB Auxiliary output connectors j NR 4 D O O ONO XO AUX FREQUENCY TRIGGER TRIGGER DDS PHASE TRACKING IN OUT OUT ERROR OUT O poten USB IN 1 2 3 RS232 Y USB HUB OUT EA CT Figure 4 80A07 rear panel Input and Output Connector Care The input and output connectors on the front panel are highly sensitive connec tors providing high frequency signal connections To maintain signal integrity it is important not to damage these connectors Never attach a cable to a connector if the cable has a worn or damaged connector because you may damage the connector When attaching or removing a cable from the connectors align the connectors carefully before turning the nut Then turn only the nut not the cable Use light finger pressure to make the initial connection then tighten the nut lightly with a wrench 80A07 Clock Recovery User Manual Getting Started Setting up the 80A07 CAUTION To prevent electrostatic damage to the 80407 and other instrumenta tion follow the precautions described in this manual and in the documentation provided with any connecting instrumen
12. bs 9 1 kg Overall dimensions 15 5 in W x 3 75 in H x 13 75 in D 394 mm W x 95 mm H x 337 mm x D The dimensions do not include feet or protruding connectors Table 7 Environmental specifications Specification Characteristics Dynamics Vibration operating Meets MIL PRF 28800F Class 3 Shock Meets MIL PRF 28800F Class 3 Bench handling operating Meets MIL PRF 28800F Class 3 22 80A07 Clock Recovery User Manual Specifications Table 7 Environmental specifications cont Specification Atmospherics Temperature Operating Nonoperating Relative humidity Operating Nonoperating Altitude Operating Non operating Characteristics 10 C to 40 C 22 C to 60 C 20 to 80 relative humidity with a maximum wet bulb temperature of 29 C at or below 40 C 5 to 90 relative humidity with a maximum wet bulb temperature of 29 C at or b below 60 C 3 000 m 9 842 ft 12 190 m 40 000 ft Table 8 Electromagnetic specifications Specification Emissions Susceptibility Characteristic The instrument meets or exceeds the EMC requirements of the following standards EN61326 1 European Community Requirements The instrument meets or exceeds the EMC requirements of the following standards EN61326 1 European Community Requirements 80A07 Clock Recovery User Manual 23 Specifications Certifications Table 9 Certifications and compliances Category EC Declaration of Confor
13. cessible as you read the marking m WARNING indicates an injury hazard not immediately accessible as you read the marking m CAUTION indicates a hazard to property including the product The following symbol s may appear on the product A A CAUTION WARNING Protective Ground Refer to Manual High Voltage Earth Terminal an D Earth Terminal Chassis Ground Standby iv 80A07 Clock Recovery User Manual AAA AER eee Environmental Considerations Product End of Life Handling Restriction of Hazardous Substances 80A07 Clock Recovery User Manual This section provides information about the environmental impact of the product Observe the following guidelines when recycling an instrument or component Equipment Recycling Production of this equipment required the extraction and use of natural resources The equipment may contain substances that could be harmful to the environment or human health if improperly handled at the product s end of life In order to avoid release of such substances into the environment and to reduce the use of natural resources we encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately The symbol shown to the left indicates that this product complies with the European Union s require ments according to Direc DE il tive 2002 96 EC on waste electrical and electronic equipment WEEE For informatio
14. d Ethernet 1 0 10Gb s Ethernet Transmitter Test XAUI Fibre 1X Channel 2X 4X 8X OIF CEI 6 Gb s 11 Gb s SATA Geni 250UI fbaud 1667 fbaua 1667 foaual 10 SONET 0C12 STM 4 SDH 0C48 STM 16 0C192 STM 64 XFP XFI XFP XFI Receiver Test Transmitter Test Fully FB DIMM1 Buffered DIMM FB DIMM2 16 Common Clock Divide Bandwidth Peaking Spread Spectrum Ratios dB Clocking a IEA 10 312 lt 4 20 dB No decade EA O A 8 5 100 4 976 to 6 375 9 95 to 11 1 1 063 10 0 638 20 dB decade 10 3 max EN 6 EN 1 667 8 ITU 20 dB No decade 6 fbaua 1 667 other 15 15 1 25 dB 300000 0 n Type 2 3 Type 2 6 000 2 09 1 25 dB 1 800 2 09 1 25 dB 300 000 2 09 1 25 dB Type 2 Type 2 0 622 0 250 204B1 No 9 95 11 2 64 8 000 EN No 4 000 20 dB decade 3 2 4 0 24 11 to 33 2nd Order Yes Transmitter Test 4 8 24 11 to 22 Full SSC swing 4 8 6 4 8 0 Forwarded 11 to 22 0 5 to 2 Receiver Test 0 06 9 6 Clock UI swing 80A07 Clock Recovery User Manual Reference Table 3 Standards supported cont Standard Ratios PCI Express yr 50 Gent foaug 1667 1 5 15 Common Clock Divide 2 5 25 1 500 Loop Bandwidth MHz Peaking dB 5 to 16 Up to 1 dB 8 to 16 Up to 3 dB 0 900 1st order with 20 dB decade 1st or 2nd order 1st order single pole 1st order single
15. d to as Non Return to Zero NRZ As the name implies the logic state in NRZ data remains constant when the data contains a series of bits with the same value 1 or 0 Data 1 0 0 1 1 0 1 Clock Jitter Transfer The clock recovery PLL phased lock loop removes virtually all of the low frequency jitter from the input data and none of the very high frequency jitter components Periodic jitter with frequency components near the roll slope of the PLL loop response will be attenuated by some degree The Jitter Transfer Function is a plot of the attenuation of the jitter passing from the input data to the recovered clock output as a function of frequency content Loop Response Peaking The Jitter Transfer Function is not exactly an inverse of the PLL loop frequency response The slope of the jitter transfer function as well as its peaking will often be different that of the PLL loop response 80A07 Clock Recovery User Manual 11 Reference 12 Golden PLL Edge Density PLL Loop Response Jitter Transfer Function uo uc roll off varies between roll off 20 40 dB decade The parameters which determine the JTF roll off slope and peaking are the relationship between loop bandwidth and the bit rate and the amount of peaking in the PLL response Several examples of the jitter transfer function versus PLL loop response can be seen in the next section The 80A07 has the ability to measure the
16. i oc late GW a sees Se Ada ase A sae iw ae 8 1 Clock Recovery BasicS 0 cece eee roo 11 User Interface ii A A aes 14 Standards Coverage sunus mana eee cece eee e een een eee 14 Specifications serre iair ee ads Sata Mee aaa Slee 19 St AAA dow dias gokart Amid ahh td ot A a tes ae ema 24 80A07 Clock Recovery User Manual i Table of Contents ii 80A07 Clock Recovery User Manual AS AE General Safety Summary To Avoid Fire or Personal Injury Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it To avoid potential hazards use this product only as specified Only qualified personnel should perform service procedures While using this product you may need to access other parts of a larger system Read the safety sections of the other component manuals for warnings and cautions related to operating the system Use Proper Power Cord Use only the power cord specified for this product and certified for the country of use Connect and Disconnect Properly Do not connect or disconnect probes or test leads while they are connected to a voltage source Ground the Product This product is grounded through the grounding conductor of the power cord To avoid electric shock the grounding conductor must be connected to earth ground Before making connections to the input or output terminals of the product ensure that the product is properly grounded Do not a
17. ing allowing jitter gain in excess of 10 dB if desired Remote control of the instrument is supported via USB and a software develop er s kit The 80A07 instrument provides a solution for triggering a DSA8200 CSA8000 and TDS8000 Series instruments from single ended or differential electrical signals The 80A07 can be used as a standalone clock recovery device or in conjunction with the following Tektronix sampling oscilloscopes DSA8200 Digital Serial Analyzer m CSA8000 CSA8000B and CSA8200 Communications Signal Analyzer With product software version 2 0 or later m TDS8000 TDS8000B and TDS8200 Digital Sampling Oscilloscope With product software version 2 0 or later The following graphics show compliance settings and the accompanying table Table 3 show common standards the data rates they employ and the loop bandwidths required for compliance measurements 80A07 Clock Recovery User Manual Reference Loop Reponse dB 30 40 Legend 10kHz 100kHz 1MHz 10MHz 100MHz Blue trace Jitter Transfer Function roll off varies between 20 40 dB decade Red trace PLL Loop Response constant 20 dB decade roll off wh 10 Gigabit Ethernet Bit Rate 10 3125 Gb s Loop Bandwidth 4 MHz Peaking 0 dB XAUI Bit Rate 3 125 Gb s Loop Bandwidth 1 875 MHz Peaking 0 dB 2x Fibre Channel Bit Rate 2 12 Gb s Loop Bandwidth
18. k if the detected Phase Error exceeds the Phase Error Limit setting or if the recovered clock is unstable The user may force a relock at any time by pressing the Lock button You can utilize the 80A07 with a Tektronix sampling oscilloscope such as the DSA8200 Digital Serial Analyzer to display the data input Use the clock output to trigger the oscilloscope Figure 5 shows a typical setup configuration Figure 5 Typical setup configuration 80A07 Clock Recovery User Manual Getting Started Remote Interface The 80A07 can be remotely controlled via the virtual front panel software The virtual front panel software can be installed on a personal computer or a Tektronix sampling oscilloscope Connection to the 80A07 is made through the USB interface The virtual front panel software requires the Microsoft Windows 2000 or XP operating system The virtual front panel software is provided on the CDROM included with your instrument Insert the CDROM into the CDROM drive and follow the installa tion prompts Refer to the user instructions on the CDROM for operation of the virtual front panel software Remote Control Remote control of the 80A07 is possible with the use of the Software Develop er s Kit SDK The SDK is available on the CDROM provided with your instrument Refer to the instructions provided on the CDROM for use of the developer s kit U
19. lectrical Clock Recovery instrument To meet specifications two conditions must first be met m The instrument must have been operating continuously for 20 minutes within the operating temperature range specified m The instrument must be in an environment with temperature altitude and humidity within the operating limits described in these specifications Table 4 Characteristics Specifications Characteristics Data inputs outputs Input configuration True differential Output configuration True differential Unused outputs must be terminated into 50 Q Connector type APC 3 5 Impedance 50 Q Coupling DC Insertion loss 2 6 dB or better 10 MHz to 12 5 GHz Maximum nondestruct range 5 Vpk pk Maximum operating range 5 Vok pk Input sensitivity Single ended 30 mVpp at 10 Gbps Differential 15 mVpp at 10 Gbps Clock output Connector type APC 3 5 Impedance 50 Q Coupling DC Amplitude Minimum 300 MVpp Typical 540 MVpp 80A07 Clock Recovery User Manual 19 Specifications Table 4 Characteristics cont Specifications Amplitude accuracy Duty cycle accuracy Jitter Typical Maximum Return Loss Rise Fall Typical Maximum Subrate output Connector type Impedance Coupling Divider function from main CLOCK OUTPUT Amplitude Minimum Maximum Amplitude accuracy Duty cycle accuracy Jitter Typical Maximum Return loss Minimum Rise fall Typical Maximum 20 Characteristics 10 or 30 mV 3 Ul RMS
20. mity ENS EN 61326 EN 61000 4 2 IEC 61000 4 3 IEC 61000 4 4 IEC 61000 4 5 IEC 61000 4 6 IEC 61000 4 11 EN 61000 3 2 EN 61000 3 3 24 Standards or description Complies with the following requirements of the EMC directive EN61326 EMC requirements for Class A electrical equipment for measurement control and laboratory use Annex D Electrostatic discharge RF electromagnetic field immunity Electrical fast transient burst immunity Power line surge immunity Conducted RF immunity Voltage dips and interruptions immunity AC Power Harmonic Current Emissions Voltage changes fluctuations and flicker 80A07 Clock Recovery User Manual
21. n about recycl ing options check the Support Service section of the Tektronix Web site www tektronix com This product has been classified as Monitoring and Control equipment and is outside the scope of the 2002 95 EC RoHS Directive This product is known to contain lead cadmium and hexavalent chromium Environmental Considerations vi 80A07 Clock Recovery User Manual AS AA Preface This is the user manual for the 80A07 Electrical Clock Recovery instrument The manual covers capabilities installation operation and specifications of the instrument Manual Structure This manual is composed of the following chapters m Getting Started provides a brief product description and how to install your instrument Information about accessories to use with your product is also found here m Reference provides more detail on the funtions and capabilites of the instrument m Specifications lists the specifications for this instrument 80A07 Clock Recovery User Manual vii Preface viii 80A07 Clock Recovery User Manual Getting Started Clock Recovery Golden PLL Recover Clocks for Optical Storage Enterprise and Telecom Testing This section contains information on key features of your instrument installing your instrument and getting acquainted with the controls Many communication standards now specify that jitter testing must be carried out using a reference clock that has been derived from the data signal
22. n the measured edge density varies greatly from the expected edge density Some serial data compliance standards such as SATA require the loop parameters be calibrated to a specified edge density regardless of the edge density of the actual data Clock Multiplication and To lock to NRZ data the phase detector used in a clock recovery PLL does not Division require an edge at every unit interval This property can be utilized to multiply a clock frequency The PLL will lock to a frequency that is a multiple of the clock applied to the data input To multiply a clock you enter the desired output frequency as the clock frequency This must be an integer multiple of the input frequency To calibrate the loop response for known jitter transfer performance you also enter the preclinical of the multiplication factor in percent as the expected edge density For example for 2X multiplication enter 50 for 3x enter 33 for 5x enter 20 etc The clock recovery unit will phase lock to the multiple of the input data frequency providing a clean multiple of the input clock at the output While the PLL can accept data with edges at a sub multiple of the clock rate it can handle the converse edge rates greater than one per unit interval corre sponding to edge densities greater than 100 Thus the PLL itself can not be used directly to divide a clock to a lower multiple The 80A07 provides an additional Sub Rate Clock output which is divided to
23. om Bit Stream PRBS pattern has an edge density of 50 Other examples 80A07 Clock Recovery User Manual Reference include a repeating 1100 pattern which has a 50 edge density and a repeating 11110000 pattern which would have an edge density of 25 All clock recovery systems require a minimum edge density to operate properly If a long pattern of all ones or zeros were sent the clock recovery would not be able to track jitter or spread spectrum clock SSC modulation or may even lose lock on the data clock Data encoding standards eliminate this possibility by either modulating the bit stream using a set of rules that set a minimum for the number of consecutive bits set to the same logic state or add overhead data bits to the packet which guarantee transitions occur even when the payload data is bit stream of only one logic state The edge density represents the amount of energy going into the clock recovery phase lock loop The average energy effects the parameters of loop gain and bandwidth Therefore an instrumentation grade clock recovery system such as the 80A07 requires information on the edge density to keep the loop parameter settings calibrated In the 80A07 this can be done by one of two methods auto and manual modes In auto mode the actual average edge density is measured and automatically calibrates the loop parameter settings In manual mode the user enters the expected edge density A warning message is generated whe
24. portant requirement for testing XFP and other 10 Gb s MSA modules 80A07 Clock Recovery User Manual 1 Getting Started Key Features The 80A07 provides a quality clock recovery solution with the following features m 100 Mb s to 12 5 Gb s continuous data rate coverage Accurate variable loop bandwidth from 100 kHz to 12 MHz m Auto lock capability with LED display m Programmable peaking adjustment with first and second order rolloff capability m Self measured and displayed Phase Locked Loop PLL frequency response USB control connection or stand alone operation via front panel m Single ended or differential 50 Q data inputs outputs m DC coupled data through path m Full and divided clock outputs with selectable divide ratios m Measurement of clock phase deviation as a function of frequency and time m Data measurement capability m Edge Density Measurement determines the mark density of the signal under test m Ideal for spread spectrum clock SSC applications with large frequency excursions m Four memory locations for saving user setups 80A07 Clock Recovery User Manual Getting Started Installation AC power connector To install the 80A07 connect the supplied AC power cord to a properly grounded AC supply The input voltage requirement is 100 VAC to 240 VAC at 50 Hz to 60 Hz Press the power button on the instrument using the front panel On Standby switch 0 USB IN
25. pply a potential to any terminal including the common terminal that exceeds the maximum rating of that terminal Power Disconnect The power cord disconnects the product from the power source Do not block the power cord it must remain accessible to the user at all times Do Not Operate Without Covers Do not operate this product with covers or panels removed Do Not Operate With Suspected Failures If you suspect there is damage to this product have it inspected by qualified service personnel Avoid Exposed Circuitry Do not touch exposed connections and components when power is present Use Proper Fuse Use only the fuse type and rating specified for this product Do Not Operate in Wet Damp Conditions Do Not Operate in an Explosive Atmosphere Keep Product Surfaces Clean and Dry Provide Proper Ventilation Refer to the manual s installation instructions for details on installing the product so it has proper ventilation 80A07 Clock Recovery User Manual iii General Safety Summary Terms in this Manual These terms may appear in this manual WARNING Warning statements identify conditions or practices that could result in injury or loss of life N CAUTION Caution statements identify conditions or practices that could result in damage to this product or other property Symbols and Terms These terms may appear on the product on the Product ar oes DANGER indicates an injury hazard immediately ac
26. r reconditioned to like new performance All replaced parts modules and products become the property of Tektronix In order to obtain service under this warranty Customer must notify Tektronix of the defect before the expiration of the warranty period and make suitable arrangements for the performance of service Customer shall be responsible for packaging and shipping the defective product to the service center designated by Tektronix with shipping charges prepaid Tektronix shall pay for the return of the product to Customer if the shipment is to a location within the country in which the Tektronix service center is located Customer shall be responsible for paying all shipping charges duties taxes and any other charges for products returned to any other locations This warranty shall not apply to any defect failure or damage caused by improper use or improper or inadequate maintenance and care Tektronix shall not be obligated to furnish service under this warranty a to repair damage resulting from attempts by personnel other than Tektronix representatives to install repair or service the product b to repair damage resulting from improper use or connection to incompatible equipment c to repair any damage or malfunction caused by the use of non Tektronix supplies or d to service a product that has been modified or integrated with other products when the effect of such modification or integration increases the time or difficulty of servicing
27. scanned during locking m Bandwidth Bandwidth of the recovery loop measured at 3 dB m Peaking Peaking of the recovery loop Also sets 1st or 2nd order roll off of untracked jitter m Nominal Edge Expected edge density of incoming data Density Required to set bandwidth correctly 80A07 Clock Recovery User Manual 7 Getting Started m Edge Density Mode Sets bandwidth Calculations are based on the Expected Edge Density user entered or edge density measured during lock m Clock Amplitude Output amplitude of the full rate clock m Sub rate Amplitude Output amplitude of the sub rate clock m Sub rate Division Division ratio of the sub rate clock All settings are saved automatically at power off and restored at power on You can also save current settings to one of four Setups that can be recalled later The left side of the display provides several continuously updated measurements m Frequency The measured frequency of the recovered clock m Phase Error The peak to peak phase error between the incoming data and the recovered clock This measured value increases if jitter is present on the input data that is not being tracked by the recovered clock m Phase Error RMS The RMS phase error between the incoming data and the recovered clock Lock State Reports whether the CR is locked unlocked or in the process of locking By default the 80A07 is configured in Auto Lock Mode where it automatically attempts to acquire loc
28. ser Adjustments The 80A07 contains no user adjustments 80A07 Clock Recovery User Manual 9 10 Getting Started Accessories Standard Accessories Optional Accessories This section lists the standard and optional accessories available for the instrument The following accessories are shipped with the instrument Table 1 Standard accessories Item Part number 80A07 Electrical Clock Recovery User Manual 071 2195 xx 80A07 Software disc Virtual Front Panel and software developer s kit 063 4040 xx Power Cord 161 0104 xx Rack mount hardware Left bracket 119 7360 xx Right bracket 119 7361 xx Hardware bag screws 119 7363 xx USB cable 174 4401 xx Fuse 119 7362 xx You can order the following accessories for use with the 80A07 Consult a current Tektronix catalog for additions changes and details Table 2 Optional accessories Item Part number Cables 450 mm 18 inch 1 dB loss Y 20 GHz recommended for work 015 0560 xx to 20 GHz SMA male 50 Q termination 015 1022 xx Connector saver 3 5 mm SMA 015 0549 xx SMA accessory kit 020 1693 xx 80A07 Clock Recovery User Manual YY ADA Reference Clock Recovery Basics A clock recovery system is used to generate a sampling clock from a stream of data with an embedded clock The sampling clock is then used by the decision circuit to determine when to decide the logic state of the incoming data In most cases the data is line coded in a format referre
29. source first and to the instrument second CAUTION To prevent damage from electrostatic discharge install the 50 Q terminations on the I O connectors when the connectors are not in use To prevent damage to the instrument discharge to ground any electrostatic charge that may be present on the center and outer conductors of cables before attaching the cables to the instrument To prevent damage to the instrument do not create an ESD antenna by leaving cables dangling off the input with the other end open Always use a wrist strap when making signal connections Wear antistatic clothing and work in a static free workstation To prevent damage to the instrument do not apply a signal outside the Maximum Input Voltage Swing For information on creating a static controlled workstation consult the Electron ic Industries Association document EIA 625 Requirements for Handling Electrostatic Discharge Sensitive ESDS Devices 80A07 Clock Recovery User Manual Getting Started Getting Acquainted with Your Instrument Loop through data General Purpose knob output terminate Adjust settings with 50 Q when Recovered clock with Scroll through menus Power Data input not in use programmable sub rates Push to confirm settings on button Tektronjix 80A07 BERTScole CR A nr O D A al a PY par Ser opts
30. the product THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES EXPRESS OR IMPLIED TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE TEKTRONIX RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES W2 15AUG04 CA Table of Contents General Safety Summary oooooomccocococororrrrrmmm iii Environmental Considerations 0 c cece cece cee ceeee v Prefacio iii iia A aa vii Manual Strctire oir EA A DAA ER AR vii Getting Started icon a is ii ida CEN BS 1 Clock RECOVERS A ee Se tec eat A eases 1 KEEN A a ADIL Sale game a 2 stat A IO O DA 3 Electrostatic Discharge 1 1 ot iin A a eee eee eee 3 Static Controlled Workstation 0 2 0 0 cece eee eee eee eee eee 4 Getting Acquainted with Your Instrument 000 0000 eee ee 5 Input and Output Connector Care 0 eee eee cee eee 6 Setting up the 80A07 ss cee a cote a A eG ee 7 Remote Intertaces ii O IA DO a 9 Remote Control a A A E O A E R aA 9 User Adjustments mino a TE a tee a a aN eae ea ea 9 ACCESSOMES AS A IA eas E A 9 Referenc s seso
31. ts See Electrostatic Discharge starting on page 3 NOTE For best repeatability and to prolong connector life use a torque wrench and tighten the connection to the range of 79 112 N cm 7 10 in Ib If the connectors receive heavy use such as in a production environment you should install adapters to make connections After the proper connections have been made for data input and clock out and the instrument has been powered on you may adjust the input settings NOTE The DATA OUTPUT connectors must be terminated if not in use or else the reflections that result will severely degrade performance Current settings are displayed on the right side of the display Use the knob or cursor buttons to scroll through menu items Press the knob or enter button to select an item to adjust Use the ESC button to back out of a menu or cancel an adjustment When editing a numeric setting use the left and right cursor buttons to move through digits and use the knob to make changes Press the knob or ENTER button to accept a change or press the ESC button to cancel changes Many industry standards are also available from the front panel menu After selecting a standard the nominal data rate loop bandwidth and peaking settings are entered automatically You can manually enter the following settings m Nominal Data Nominal rate of the recovered clock Rate m Lock Range The frequency range around the nominal rate that will be
Download Pdf Manuals
Related Search