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Techniques for preventing tonal behavior of data weighted averaging algorithm in Σ-Δ modulators

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1 Author(s)
M. Vadipour ; Teradyne Inc., Agoura Hills, CA, USA

Two techniques for prevention of in-band tones in DWA mismatch noise shaping algorithm are presented. "offset technique" moves in-band tones away from baseband, improving SNR by ∼10 dB, and attenuates maximum in-band tone by as much as ∼25 dB. "Randomized DWA" is a combination of simultaneous randomization and DWA, which attenuates tonal behavior in all frequencies, preventing aliasing of tones or tone shifting for any arbitrary input signal.

Published in:

IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing  (Volume:47 ,  Issue: 11 )