Multistage bandpass .DELTA. .SIGMA. modulators and analog-to-dig

Details Multistage bandpass .DELTA. .SIGMA. modulators and analog-to-dig Multistage bandpass .DELTA. .SIGMA. modulators and analog-to-dig

1992-11-16

1994-02-01

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341118, H03M 302

Patent

active

052835782

ABSTRACT:
An architecture for oversampled delta-sigma (.DELTA.-.SIGMA.) analog-to-digital (A/D) conversion of high-frequency, narrow-band signals includes multistage .DELTA.-.SIGMA. modulators that incorporate band-reject noise shaping centered at one fourth the clock frequency Fs. These modulators cascaded with a bandpass digital filter also centered at a frequency of Fs/4 perform A/D conversion for high-frequency, narrow-band signals centered at the same frequency. The bandpass modulators are implemented by use of resonators in existing low-pass multistage modulators.

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Z. X. Zhang et al., "Bandpass .DELTA..SIGMA. A/D Converter Using Two-Path Multibit Structure", Electronics Letters, vol. 27, No. 22, Oct. 24, 1991, pp. 2008-2009.
R. Schreier et al., "Multibit Bandpass Delta-Sigma Modulations Using N-Path Structures", IEEE International Symposium on Circuits and Systems, May 1992, pp. 593-596.

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