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A 2/sup nd/-order double-sampled /spl Delta//spl Sigma/ modulator with individual-level averaging

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3 Author(s)
Thanh, C. ; Dept. of Electr. & Comput. Eng., California Univ., Davis, CA, USA ; Lewis, S.H. ; Hurst, P.J.

Delta-sigma modulators (/spl Delta//spl Sigma/Ms) can provide high-resolution, high-linearity analog-to-digital conversion without accurately matched passive components. With a second-order modulator, the signal-to-quantization-noise ratio increases with the oversampling ratio by 15 dB/octave. Therefore, maximizing the sample rate for a given signal bandwidth is important in high-resolution applications. To increase the sample rate by an amount close to the ideal maximum of 100%, individual-level averaging (ILA) can be used. ILA is a dynamic-element matching technique that has been shown to improve the linearity of /spl Delta//spl Sigma/Ms with multibit feedback. In this paper the use of ILA in a double-sampled /spl Delta//spl Sigma/M is described.

Published in:

VLSI Circuits, 1996. Digest of Technical Papers., 1996 Symposium on

Date of Conference:

13-15 June 1996