Continuing Paper Notes: Linear LMS Compensation for Timing Mismatch in TIADCs

Results:

• Performance is quantified using the inverse of the SINAD.
• Known Input Spectrum:
  1500 taps
  Input is filtered white noise, Butterworth 20th order wc cutoff
  JL -79 to -25 dB
  EO -62 to -35 dB
  PLH -90 to -39 dB
  FIR LMS -90 to -39 dB (best overall)

  150 taps FIR LMS clearly better (same performance), others have -70 and > dB

  15 taps FIR LMS clearly better (same performance), others have -54 and > dB

• Unknown Input Spectrum
  150 taps, fixed nominal filter Butterworth lowpass 10th order cutoff 0.4Hz
  FIR LMS clearly better with nearly same performance, others have -88 and >
• Periodic Input Signal
  150 taps, Butterworth lowpass input filter 20th order cutoff 0.4Hz
  FIR LMS clearly better -172.83 dB
  PLH -71.65 dB
  JL -30 dB
  EO -58.37 dB

Final Comments:

Each of the methods can be shown to be equivalent in certain cases but the FIR LMS seems to out perform on a wide scale because of the optimal derivation.

Official Reference:

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