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WRPLL: replace PI controller with new filters #296

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sb10q merged 3 commits from morgan/artiq-zynq:new_filter into master 2024-05-08 18:50:56 +08:00
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morgan commented 2024-05-08 16:32:37 +08:00
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Summary

  • need #295 to fix compilation warning for standalone & master

  • remove PI's anti-windup

  • replace PI controller with new filters

    • two new filters are implemented due to the different DDMTD sampling frequency when changing main frequency
      • they have better phase margin
        • 125MHz: 47.33 deg -> 62.39 deg
        • 100MHz: 47.33 deg -> 65.12 deg
      • both has 3db cutoff frequency of ~130Hz
    • Close loop frequency simulation:
      close_loop_125MHz
      close_loop_100MHz

  • Si549 master <-> Satellite Lock test

    • tested on both 125MHz and 100MHz filter
    • 50 consecutive runs are tested and no lock failure
    • 1hr lock test and it stayed locked for the test duration.

Phase noise

  • The phase noise of the WRPLL + the new filters reach the noise floor of the spectrum analyzer, the real result maybe even lower than this

Si549 master <-> Satellite 125MHz

satman125MHz_phase_noise

Si549 master <-> Satellite 100MHz

satman100MHz_phase_noise

SynthNV 125MHz <-> Si549 standalone 125MHz

standalone_phase_noise

## Summary - need #295 to fix compilation warning for standalone & master - remove PI's anti-windup - replace PI controller with new filters - two new filters are implemented due to the different DDMTD sampling frequency when changing main frequency - they have better phase margin - 125MHz: 47.33 deg -> 62.39 deg - 100MHz: 47.33 deg -> 65.12 deg - both has 3db cutoff frequency of ~130Hz - [Close loop frequency simulation](https://git.m-labs.hk/M-Labs/wrpll-simulation): ![close_loop_125MHz](/attachments/3f258269-0525-461b-a0c0-3bc8e0000ba8) ![close_loop_100MHz](/attachments/005dbe44-8ad3-4166-9a45-5d2c057fd284) - Si549 master <-> Satellite Lock test - tested on both 125MHz and 100MHz filter - 50 consecutive runs are tested and no lock failure - 1hr lock test and it stayed locked for the test duration. ## Phase noise - The phase noise of the WRPLL + the new filters reach the noise floor of the spectrum analyzer, the real result maybe even lower than this ### Si549 master <-> Satellite 125MHz ![satman125MHz_phase_noise](/attachments/e2e70d78-7f05-4b80-ae4b-b91f4a79f3a6) ### Si549 master <-> Satellite 100MHz ![satman100MHz_phase_noise](/attachments/ac34c056-2631-4436-b3b0-186364be543f) ### SynthNV 125MHz <-> Si549 standalone 125MHz ![standalone_phase_noise](/attachments/581c9d9f-2607-454e-a776-d723f69b74d1)
satman125MHz_phase_noise.png
211 KiB
satman100MHz_phase_noise.png
215 KiB
close_loop_125MHz.png
30 KiB
close_loop_100MHz.png
29 KiB
standalone_phase_noise.png
210 KiB
👍 1
morgan added 3 commits 2024-05-08 16:32:38 +08:00
morgan changed title from new_filter to WRPLL: replace PI controller with new filters 2024-05-08 16:34:51 +08:00
sb10q merged commit 35ea0ed2ca into master 2024-05-08 18:50:56 +08:00
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Reference: M-Labs/artiq-zynq#296
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