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Programmable Low-Pass Filter Automated Characterization System

Programmable Low-Pass Filter Automated Characterization System. Andrei Branescu. Table of contents. Test Plan Characterization system presentation Characterization program implementation Results Conclusions. Parametrii blocului testat. 5’th order Bessel type low-pass filter

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Programmable Low-Pass Filter Automated Characterization System

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  1. Programmable Low-Pass Filter Automated Characterization System Andrei Branescu

  2. Table of contents • Test Plan • Characterization system presentation • Characterization program implementation • Results • Conclusions

  3. Parametrii blocului testat • 5’th order Bessel type low-pass filter • Programmable cutoff frequency in 4 ranges: 1Mhz – 40MHz • 9 bits for frequency settings(512 settings)

  4. GdB GdB 3dB GB f f fc Characterization target Cutoff frequency Gain • Frequency characteristics determination • Determine constant region • Determine gain on constant region • Determine passband gain • Determine the frequency for witch the gain drops with 3dB rapported to band gain

  5. Table of contents Test Plan Characterization system presentation Characterization program implementation Results Conclusions

  6. Characterization system

  7. Testing procedure

  8. Testing procedure

  9. Table of contents Test Plan Characterization system presentation Characterization program implementation Results Conclusions

  10. Test program modules

  11. Database structure

  12. Database handle front panel

  13. Test module front panel

  14. Test module execution flow

  15. Test module components • Gain measurement module • Cutoff frequency measurement module • Communication modules

  16. Table of contents Test Plan Characterization system presentation Characterization program implementation Results Conclusions

  17. Tests • Tested chips: 10 – once • 4 chips – another 9 tests for each

  18. Filter characteristics - 1

  19. Filter characteristics - 2

  20. Filter characteristics - 3

  21. Cutoff frequencies

  22. Table – 4 chips

  23. Table – all chips suspicious

  24. Conclusions • Automated filter characterization • Measurements: Cutoff frequency • Created modules: Automated testing module Results diplay module • 10 tested chips • 4 chips tested 10 times • Chip 27 – broken • Range 4 – design error

  25. End

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