DocumentCode
1408022
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
Volume
47
Issue
11
fYear
2000
fDate
11/1/2000 12:00:00 AM
Firstpage
1137
Lastpage
1144
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;
fLanguage
English
Journal_Title
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
Publisher
ieee
ISSN
1057-7130
Type
jour
DOI
10.1109/82.885121
Filename
885121
Link To Document