Open source PLL User guide
Contents
1. 10V Excitation Amp Min Freq abs Min Phase rel Min Amp abs Min Exci abs 4 73478 V max 10V 20 000000m il I I I I 1 I 1 1 1 I 1 32579 6690 Hz 7 162 De g 0 000 0 000 V Excitation Freq 0 00 20 0m 40 0m 60 0m 80 0m ask EG 140m 160m 180m 200m 220m Max Freq abs Max Phase rel Max Amp abs Max Exci abs 2766 1760 H ioke dn EE ud ay vi 32952 6884 Hz 7 162 Deg 2 250 V 10 000 V 158 302 644 814 oise e 2 p0 ad E i Sensitivity Freq Sensitivity Phase Sensitivity RA Sensitivity EA PI Parameters Amp Signal Select 2 Resonator Amplitude filtered 53 62m V Hz 1 396 V Deg 8 000 V V 1 000 V V PAmp 100 000000u Mux Frequency Mux Phase Mux Amplitude Mux Excitation ns Co Output 2 w Output 3 Output 4 Output 5 I Amp 50 000000u dB e z LP Filter Phase Frequency LP Filter Amp 77 j A 2 0 000000 93 Hz x 5 8 Hz Lock In Amp e lt 50 000000u Excitation Freq Resonator Phase Resonator Amp Excitation Amp PiParameters Phase 20000 saat KE daim aohm 2a 0 00 20 0m 40 0m 60 0m 80 0m 100m 120m 140m 160m 180m 200m 220m se ft Time s 61 6 dB SHE Phase Detector Time Cst s EE Noise dB 2 125 893 Noise V rms 3 58784u Ev g DE se as 127 2 dB eo Set Points Noisy Clean 20 0u s Resonator Phase 119 023 Deg 150us 100us 1 50m s Lock In Phase Resonator Amplitude 1 V Resonator Amplitude 999 999m V Relative Resonator Phase 0 Deg Excitation F2. Note The Q factor and the gain at the resonance are important information for the auto adjustment function of the amplitude controller SPM PLL User s Manual 10 Soft Ki 4 3 Operation Set up Controls pe Operation Set up Excitation Freq Resonator Phase Resonator Amp Excitation Amp Freq Reference Phase Reference Amp Reference Excitation Ref 32766 17568 Hz 119 02310 Deg 1 00000 V 4 59340 V Freq Range Phase Range Amp Range Excitation Range 187 Hz Min Freq fabs 716 deg Min Phase rel 1 25 V Min Amp fabs 10V Min Exci abs 32579 6690 Hz 7 162 Deg 0 000 V 0 000 V Max Freq abs Max Phase rel Max Amp fabs Max Exci abs 32952 6884 Hz 1 162 Deg 2 250 V 10 000 V Sensitivity Freq Sensitivity Phase Sensitivity RA Sensitivity EA 3 62m V Hz 1 396 V Deg 6 000 V V 1 000 V V Mux Frequency Mux Phase Mux Amplitude Mux Excitation Output 2 Output 3 Output 4 Outputss LP Filter Phase Frequency LP Filter Amp 93 Hz 5 6 Hz PLL interface Operation Set up Controls These controls allow the set up of the reference values and the configuration of the analog output signals Up to four analog signals can be generated by the PLL For each signal the reference the range and the output number can be adjusted A low pass filter is applied on the output signals and the frequency cut off can be adjusted from a menu There are tw
3. gain 13 dB at the resonance and the auto set of loop gains for both controllers The new PLL technique ensures that the noise levels are independent of measurement ranges SPM PLL User s Manual Softkle 2 Theory of Operation The diagram of PLL running on the Signal Ranger Mk3 DSP board is illustrated in the following figure j Resonator i Synthesizer I Excitation Freq Output 1 Input 1 Output 2 Output 3 Output 4 Output 5 Pl Phase set point Corrector Pl Amplitude set point PLL schematic The synthesizer sends a sine wave on output 1 Inout 1 measures the output of the resonator The phase detector measures the amplitude and the phase of the resonator output signal with respect to its excitation The phase detector algorithm measures the phase of the resonator alone automatically correcting for the phase of board s digital and analog chains So no special calibration is necessary before using the PLL When working with a second order resonator specifying a phase of 90 degrees will lock the PLL at precisely the resonance frequency The amplitude and phase control loops keep the resonator phase and output amplitude at specific set points The PLL can generate up to four analog signals on outputs 2 3 4 and 5 The possible selections for these signals are The resonator phase The resonator amplitude The excitation amplitude
4. Controls and Switches PI Parameters Amp F Amp 6 1 dE l i a 77 5 dB i j Lock In Amp PI Parameters Phase P Phase 616 dB I Phase Pa 127 2 dB el Lock In Phase The sign and the gain of the Proportional and Integral factors can be adjusted with these controls for both controllers The OFF ON buttons engage or deactivate each controller The Auto buttons can be used to determine the PI gains and LP filter set up for both controllers For the phase controller the following dialog box allows specifying the desired bandwidth Desired Bandwidth 50 0 Hz Between 1 5 Hz and 4500Hz SPM PLL User s Manual 12 Soft Ki Select the desired bandwidth and click ok Then the interface will automatically set the LP filter for the phase frequency the PI gains and the time constant of the phase amplitude detector to reach the desired bandwidth For the amplitude controller the following dialog box allows specifying the desired bandwidth Desired Bandwidth 5 Hz Between 1 5 Hz and 10Hz 15 00 dB Gain at Resonance dB 20000 0 Q Factor To be able to determine the proper PI gains the auto adjustment function must know the gain at the resonance and the Q factor of the resonator These values can be measured with the Resonator Sweep function The interface will automatically set the LP filter for the amplitude signals the PI gains and the time constant of the phase amplitude detector to
5. The excitation frequency For each signal the gain or the range can be specified to obtain the desired output sensitivity Also an adjustable low pass filter is added to increase the resolution of the output signals if necessary An offset reference can be added so the analog output signal is centered on a user selectable value The PLL is controlled and adjusted using a graphical user interface running on a Windows PC SPM PLL User s Manual 7 Soft Ki 3 Software and Hardware Installation Note The software must be installed before connecting the PLL unit to a PC The software installs the USB driver automatically Windows XP Windows Vista and Windows 7 are supported on a 32 bit or 64 bit PC To install the software launch the SoftdB_SPM_PLL_1_8 exe SPM PLL User s Manual Softkle 4 PLL User Interface J Soft dB PLL Version 1 7 ea Main Signal History Response Tests Signal shift Signal Select 1 Excitation Freq filtered gt Operation Set up Amp Step 20 000000m 0 05 V Excitation Freq Resonator Phase Resonator Amp Excitation Amp Phase Step 10 000000m Freq Reference Phase Reference Amp Reference Excitation Ref wu 2 Deg D annia 3276617868 Hz 119 02310 Deg 1 00000 V 4 59340 V Freq Range Phase Range Amp Range Excitation Range Output E 10 000000m 187 Hz w 716 deg 125V w
6. reach the desired bandwidth 4 7 Loop Response Test Controls Response Tests Amp Step Phase Step Theses controls allow the testing of the loop response of both controllers These controls can be used only if the corresponding controller is engaged The test function measures the step response of the controller An adjustable step is applied on the set point and the resonator phase or output amplitude is recorded during the test The Amp step and Phase step are used to define the amplitude of the step For instance if the Phase step control is set to 3 the controller set point will be stepped up by 3 deg for the test The set point step is returned to zero after the test The Test button launches the following interface phase controller case SPM PLL User s Manual 13 Softkle T4 SR3 PLL TestPIResponseVerl 3 vi Resonator Phase Response Step Response Resonator Phase 2 500 2 250 2 000 1 750 Phase Deg 750 000m 500 000m 250 000m 0 000 l l l l l l 0 00 10 0m 20 08 0 0m 5 0 50 0m 60 0m 70 0m 0 0m 0 0m 100m Close Loop Response Time 5 Amplitude dB 15 20 I I 0 05 0 1 10 Frequency Hz Bandwidth 45 7502 Hz Phase controller test interface Resonator Phase Tab In the first tab Resonator Phase Tab the top curve presents the step response and the bottom curve is the closed loop frequency response of the derivative of the step response i e the spectrum of the c
7. 1 5 R we AE d MADE IN CANADA FABRIQU AU CANADA 1 1 Power Supply The PLL works with an external 5V 5 power pack 1 2 USB The PLL is controlled by a Windows PC through a USB connection The high speed USB 2 0 PC link provides a throughput in excess of 35 Mb s in the read and write directions 1 3 Analog Inputs Number of Inputs 1 Resolution 16 bits Raw Noise Figure 300 uV RMS Sampling Rate 150 kHz Analog Input Bandwidth 0 to 10 MHz includes DC Input Type Single Ended Input Leakage 1 yA max Anti Aliasing Filter None Dynamic Range 10V Group Delay 2 samples SPM PLL User s Manual 4 Softkle 1 4 Analog Outputs Number of Outputs Resolution Noise e 20MHz bandwidth e 20 kHz bandwidth Offset Drift with Temperature Gain Drift with Temperature Offset Drift with Time Sampling Rate Analog Output Bandwidth Output Type Dynamic Range Source Sink ability Anti Aliasing Filter Group Delay e Output 1 and 2 e Output 3 and 4 e Output 5 SPM PLL User s Manual 5 16 bits Up to 55 mV pk pk on FFFFr 0000 alternating code sequence lt 25 UV RMS 2 ppm FSR degC 2 ppm FSR degC 13 ppm FSR 500 hours 150 kHz 0 to 80 kHz includes DC Single Ended 10 V 4mA None 2 5 samples 2 5 samples 3 samples Soft Ki 1 5 PLL Performance PLL Module Specifications Input Range Output Range 10V external 1 100 and 1 1000 at
8. 9 18 117 116 118 14 lGnd Gnd Gnd Gnd Gnd Gnd 1Gnd Grd Gnd Gnd Gnd 1Gnd FUSE 5 VDC GPIO 0 7 GPIO 8 15 Mire erase eS CHASSIS QEP 0 QEP 1 N GROUND Nd D MADE IN CANADA FABRIQU AU CANADA 5MF 1 5 R Left Connector Right Connector SPM PLL User s Manual 19
9. B 2 124 768 Noise V rms 4 08421 u These graphs present various signals of interest in real time The selection of the signals is done through the Signal Select menu The following table presents the possible choices SPM PLL User s Manual 15 Softkle Resonator Output Excitation Resonator Phase raw Excitation Freq raw Resonator Amp raw Excitation Amp raw Excitation Freq filtered Resonator Phase filtered Resonator Amplitude filtered Excitation Amplitude filtered Output 2 Excitation Freq Output 3 Resonator Phase Output 4 Resonator Amp Output 5 Excitation Amp Signal Description signal measured by the DSP board on input 1 generated by the DSP board on output 1 Resonator Phase raw Resonator phase in degrees as measured by the phase detector The phase detector algorithm measures the phase of the resonator alone automatically correcting for the phase of board s digital and analog chains This is the raw signal and no low pass filter is applied Excitation Freq raw This value in Hz is fixed if the phase controller is OFF If the phase controller is engaged this signal is the output of the phase corrector This is the raw signal and no low pass filter is used Resonator Output Amp raw Resonator output signal amplitude as measured by the phase detector in V This is the raw signal and no low pass filter is applied Excitation Amp raw Excitati
10. at Resonance 13 44 dE Excitation Amp Q Factor 3548 5 half max 8 00000 V Q Factor 44189 1 derivative Resonator Sweep Interface The resonator sweep interface automatically sets the time constant of the phase detector at 1ms to obtain a precise measurement of both the phase and amplitude The original time constant for the phase detector is replaced after the sweep measurement Before starting the measurement the start and stop frequencies must be adjusted along with the frequency resolution and the excitation amplitude The Measurement Pause control specifies the waiting period between a change in excitation frequency and the corresponding measurement When the resonator Q factor is large the stabilization time after the excitation change can be long For instance for a Q factor of 25k and a resolution of 0 05Hz a stabilization time of 300ms is necessary At the end of the measurement the resonance frequency the gain at the resonance the phase at the resonance frequency and the Q factor are computed and presented by the interface Two methods are used to compute the Q factor 1 phase derivative at the maximum gain and 2 half maximum method Use the Quit button to quit the measurement interface The interface will ask for an update of the frequency reference and the phase reference If the user clicks yes the phase and the frequency references will be updated with the new phase at the resonance and the new resonance frequency
11. losed loop impulse response This curve allows the evaluation of the controller bandwidth The second tab presents the excitation frequency response This is the output of the phase controller If saturations appear on this curve it means that the output of the controller reaches the maximum or the minimum of the operation range If required the operation range can be increased to avoid this non linear behaviour or a smaller step excitation can be used to insure a linear behaviour 4 8 Phase Output Amplitude and Excitation Frequency Indicators Resonator Phase 111 561 Deg Resonator Amplitude 15 6265n W Excitation Frequency 32766 179307 Hz These indicators present SPM PLL User s Manual 14 Soft Ki The resonator phase The resonator amplitude The excitation frequency A first order low pass filter is applied The filter that can be adjusted with the LP filter applied on Freq Phase Amp control see Operation Set up controls 4 9 Time Signal Graph and Signal Selection Signal Select 1 Excitation Freq filtered Amplitude Hz 20 000000m l l l l l I I I l l l 0 00 20 0m 40 0m 60 0m 0 0m 100m 120m 140m 160m 180m 200m 220m be HI Noise dB 1 158 252 Noise Hz rms 648 529 Signal Select 2 Resonator Amplitude filtered A i a i E lt 100 000000u l l l l l l l l l l l 0 00 20 0m 400m 60 0m 80 0m 100m 120m 140m 160m 160m 200m 220m Time 5 e PPT Noise d
12. mance sieisen semen Messe ces de acces 6 THEORY OF OPA Np T SOFTWARE AND HARDWARE INSTALLATION rnnunnnnnnnnnnnvnnnnnnennnennnnnnnenn 8 PLL OSER INTERFACE Le 9 Phase Detector Time Cte S sviiseiscidsisustusseervenseapsasensunssiadeuuensssenguwousaaaneanconsastwsussdaiacandessanceuel 9 HIESOMALON SVEEN ae 9 Operation Set up Controls nds ana eseee nnne 11 EXGIFATION Parameter S ssc 11 SSFP OIN S o wees tet gee ev mas ete ees cies oem ee eve cre a eies ee ead ae eee ee sede cieekideewe sen gece 12 PI Controls nd be ci sagesse esta 12 Loop Response Test Controls rnxxnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnvennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn 13 Phase Output Amplitude and Excitation Frequency Indicators x rnnnnnnennnnnnnnnnnnnnn 14 Time Signal Graph and Signal Selection ss 15 Signal HIS TON PEER ER 16 Save and Recall Configuration Files rresnannnnnnnnnennnnnnnnnnnnnnennnnnnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnr 18 SPM PLL User s Manual 3 Softkle 1 Specifications The GXSM software for the SPM controller model Mk3 includes a PLL module However the SPM controller model Mk3 can be used as a stand alone PLL when using the PC software described in this document The next figures present the front and the back of the SPM controller model Mk3 Open Source SPM CONTROLLER amp PLL FUSE 5 VDC 1 5A V GPIO 0 7 GPIO 8 15 EA CHASSE 0 12401 QEP 1 G GROUND pr 5MF
13. o LP filters one for the phase and excitation frequency signals and another one for the resonator and excitation amplitude signals For each output signal the reference can be automatically set to the current value with the button Set reference The minimum and maximum values in unit are presented for each output The minimum and the maximum depend on the selected range and the reference value The sensitivity of the output is also displayed and can be modified by adjusting the range 4 4 Excitation Parameters Output Excitation Amp 0 00000 V Excitation Freq 32766 1794 Hz max LOV Output 1 of the PLL generates a high purity sine wave The frequency and the amplitude can be adjusted with these controls If the phase controller is engaged the frequency is not adjustable and the Excitation Freq Hz control becomes an indicator If the amplitude controller is engaged the excitation amplitude is not adjustable and the Excitation Amp V control becomes an indicator SPM PLL User s Manual 11 Soft Ki 4 5 Set Points Set Points Resonator Amplitude 1 V Relative Resonator Phase 0 Deg These controls adjust the set points for the phase and the resonator amplitude Note that the phase set point is always the reference phase So the set point adjustment for the phase is done through the phase reference control see the Operation Set up controls This way the phase controller always works centered around zero 4 6 PI
14. on amplitude in V This signal is constant at the specified value if the amplitude controller is OFF If the amplitude controller is engaged this signal is the output of the amplitude corrector This is the raw signal and no low pass filter is applied Excitation Freq filtered Filtered excitation frequency in Hz This signal is constant at the specified value if the phase controller is OFF If the phase controller is engaged this signal is the filtered output of the loop controller The display low pass filter is applied to lower the noise For this signal the Signal control can be used to present the absolute value or the shift value The reference value in the Operation Set up tab is used to compute the shift value Resonator Phase filtered Filtered resonator phase in degrees as measured by the phase detector The phase detector algorithm measures the phase of the resonator alone automatically correcting for the SPM PLL User s Manual 16 Soft Ki Resonator Amplitude filtered Excitation Amplitude filtered Output 2 3 4 and 5 4 10 Signal History phase of board s digital and analog chains For this signal the Signal control can be used to present the absolute value or the shift value The reference value in the Operation Set up tab is used to compute the shift value Filtered resonator output amplitude in V The low pass filter is applied to lower the noise on this signal For this signal
15. ory Excitation Frequency Shift 20 000000m enn M Sm GA M SE ee FE KE K EE nl nn on MN Co en ee eee Se ee WN 5000000m a D ae ee ere eee 3 0 000000 ANA Ve PR SIN NY ne eect di ue meta retiens le pe HP PO EE GA OR SE ee es ee a lt se Se eee ee ME EE Sas ee ees sjette Ce komt kes Lost el selt est a 15 000000m 20 000000m TI I I I I I I I I 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Time 5 Resonator Amplitude Shift 4H Amplitude Volts Time 5 History Length 60 00 s Amplitude controller test interface Resonator Amplitude Tab 4 11 Save and Recall Configuration Files These buttons save and recall a configuration All PLL parameters are saved in the configuration file When a configuration is recalled both controllers are automatically stopped SPM PLL User s Manual 18 Soft Rel GPIO Connectors The GPIOs are located on two dB 25 connectors at the back of the instrument Left Connector 13 112 111 Ho 18 17 16 15 14 1 QEPO B QEPO A GPIO 0 7 GPIO 0 6 GPIO 0 5 GPIO 0 4 GPIO 0 3 GPIO 0 2 GPIO 0 1 GPIO 0 0 125 24 123 122 1284 120 119 18 JGnd Gnd Gnd Gnd_ Grd Gnd Gnd Gnd Gnd Gnd Gnd Gnd Right Connector 13 12 114 11019 18 1716 15 141812 11 QEP1 B QEP1 A GPIO 0 15 GPIO 0 14 GPIO 0 13 GPIO 0 12 GPIO 0 11 GPIO 0 10 GPIO 0 9 GPIO 0 8 7 6 5 G 125 24 23 122 184 1801
16. requency 32766 176016 Hz Pesosta cee li open lal ford PLL interface Main Tab 4 1 Phase Detector Time Cst s Phase Detector Time Cst 5 Fast Slow 0 Noisy Clean 20 0u 5 15 0u 5 100u 5 1 50m 5 This control adjusts the time constant of the phase detector We suggest keeping time constant to 20us fast set up which allows a bandwidth of about 8 kHz Note that the auto adjustment functions for the PI gains of both controllers amplitude and phase automatically set the time constant to 20us This way the bandwidth of the controller is only limited by the PI gains and the LP filter 4 2 Resonator Sweep The Resonator Sweep button performs a frequency scan of the resonator A sweep over a limited frequency range is used to measure the frequency response The following figure presents the measurement interface SPM PLL User s Manual Softkle EE spa SR3_PLL_MeasureResp vi lad Export tet i Open graph Phase Deg 140 00000 160 00000 180 00000 200 00000 32760 00 32761 00 32762 00 32763 00 32764 OG 32765 00 32766 00 32767 00 32768 00 32769 00 32770 00 Frequency Hz 32760 O0 32761 00 32762 00 32763 00 32764 00 32765 g0 32766 00 32767 00 32768 00 32768 00 32770 00 Frequency Hz Start Freq Hz Resolution Hz Ss 32760 0 Hz 0 0500 Hz Resonance Freq 32766 2000 Hz START Stop Freq Hz Measurement Pause Phase at Resonance 119 02 Deg 32770 00 Hz 300 ms Gain
17. sonator Phase Resonator Amp Excitation Amp Freq Reference Phase Reference Amp Reference Excitation Ref 32766 17868 Hz 119 02310 Deg 1 00000 V 4 59340 V Freq Range Phase Range Amp Range Excitation Range 187 Hz w 7 16 deg 1 25V lw 10 V Min Freq abs Min Phase rel Min Amp abs Min Exci abs 32579 6690 Hz 7 162 Deg 0 000 V 0 000 V Max Freq abs Max Phase rel Max Amp abs Max Exci abs 32952 6884 Hz 7 162 Deg 2 250 V 10 000 V Sensitivity Freq Sensitivity Phase Sensitivity RA Sensitivity EA 53 62m V Hz 1 396 V Deg 8 000 V V 1 000 V V Mux Frequency Mux Phase Mux Amplitude Mux Excitation Output 2 w Output 3 Output 4 w Output 5 w LP Filter Phase Frequency LP Filter Amp 93 Hz v 5 8 Hz A Excitation Freq Resonator Phase Resonator Amp Excitation Amp Set reference Set reference Set reference Set reference Phase Detector Time Cst s Fast Slow Noisy Clean 20 0u s 15 0u s 100u s 1 50m s Resonator Sweep Open LH Save by Soft Kel In association with ET Convergence Instruments January 2012 1040 avenue Belv d re suite 215 Qu bec Qu bec GIS 3G3 Canada T l 418 686 0993 Fax 418 686 2043 Soft Ki 1 1 1 1 2 1 3 1 4 1 5 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 4 9 4 10 4 11 SPECIFICATIONS a 4 Power SUP an anne ann ana een 4 UB 4 ANOJ INPUTS ee 4 Analog ANS a ne ren ee erecta 5 PLL POErOr
18. tenuators provided Frequency Range 3 2kHzto 75 kKHz eee Resonator Test Board An active resonator board is included with the SPM controller for easy testing and setup of the PLL module PLL Output Signal Ranges Excitation Frequency 2 85 MHz to 23 9 kHz Stand Alone Operation Excitation Amplitude 1 19 UV to 10 V Resonator Phase 6 83 uDeg to 57 3 Deg Resonator Amplitude 1 19 uV to 10 V Bandwidth 1kHz Bandwidth 5Hz Amplitude Controller Amplitude Controller Phase Amplitude PAC 100Hz to 10kHz The bandwidth is automatically adjusted when the loop auto set Detector Bandwidth function is used Software Features 1 Resonator frequency sweep for automatic measurement of resonator frequency characteristics 2 Loop gain auto set for amplitude and phase controllers Gains are set according to desired closed loop bandwidth 3 In circuit closed loop step response measurement function validates the setup of both controllers 4 Adjustable low pass filter on PLL signals Excitation amplitude frequency and Resonator phase amplitude These filters can be adjusted from 1 5 Hz to 16 kHz or bypassed 5 Real time monitoring of all PLL signals 6 Long term monitoring of PLL signals to assess the low frequency stability and noise Temperature Coefficient TCXO Stability 140 ppb over a temperature range from 20 C to 70 C TCXO Precision 2 ppm Note Noise levels are measured using the resonator board included with the SPM controller
19. the Signal control can be used to present the absolute value or the shift value The reference value in the Operation Set up tab is used to compute the shift value Filtered excitation amplitude in V The low pass filter is applied to lower the noise on this signal For this signal the Signal control can be used to present the absolute value or the shift value The reference value in the Operation Set up controls is used to compute the shift value These selections represent the 16 bit signal generated by the DSP on outputs 2 3 4 and 5 The output signals are selected with the Mux menu of the Operation Set up controls The user can select between the excitation frequency the resonator phase the resonator amplitude and the excitation amplitude An adjustable reference value is subtracted from these signals to present the shift value The sensitivity of the output signal can be adjusted with a range control Also an adjustable low pass filter is used to lower the noise on all signals The signal history for both the excitation frequency shift and the resonator shift are presented on the Signal History tab The history length is adjustable and the user can clear the history graphs with the Clear History control These graphs are useful to analyze the long term stability of the PLL and to estimate the noise SPM PLL User s Manual 17 SOFt fl 3 Soft dB PLL Version 1 7 o Main Signal Hist
20. www softdb com SPM PLL User s Manual Version 1 8 M PLLis Open Source SPM CONTROLLER amp PLL i PULSE COUNTER OX Response Tests Amp Step 0 05 V Test Phase Step 2 Deg Test Output Excitation Amp 4 73181 V max 10V Excitation Freq 2766 1778 H PI Parameters Amp PAmp 8 1 dB gt I Amp 7 oo 77 5 dB tak Lock In Amp PI Parameters Phase P Phase _ 61 6 dB I I Phase pr 127 2 dB Lock In Phase Amplitude Hz Signal Select 1 Excitation Freq filtered 20 000000m 20 000000m 0 00 20 Noise dB 1 158 74 Amplitude V Time s Noise Hz rms 613 128u Signal Select 2 I I 1 j 1 L 1 1 i 1 Om 40 0m 60 0m 80 0m 100m 120m 140m 160m 180m 200m 220m HE Resonator Amplitude filtered 100 000000u 50 000000u 0 000000 50 000000u 00 000000u 0 00 Noise dB 2 125 302 Set Points z 1 1 1 j 1 I L I I I 20 0m 40 0m 60 0m 80 0m 100m 120m 140m 160m 180m 200m 220m Time s Noise V_rms 3 84044u Resonator Amplitude 1V Relative Resonator Phase 0 Deg Resonator Phase 119 023 Deg Resonator Amplitude 1 00001 V Excitation Frequency 32766 177751 Hz Hi peg Operation Set up Excitation Freq Re
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