Title :
Techniques for preventing tonal behavior of data weighted averaging algorithm in Σ-Δ modulators
Author :
Vadipour, Morteza
Author_Institution :
Teradyne Inc., Agoura Hills, CA, USA
fDate :
11/1/2000 12:00:00 AM
Abstract :
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.
Keywords :
circuit stability; integrated circuit noise; sigma-delta modulation; SNR; aliasing; arbitrary input signal; data weighted averaging algorithm; in-band tones; noise shaping algorithm; offset technique; randomized DWA; sigma-delta modulators; tonal behavior; tone shifting; Analog-digital conversion; Baseband; Data acquisition; Degradation; Filters; Frequency; Hardware; Noise shaping; Signal processing; Signal to noise ratio;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
