Analog-to-digital converters using multistage bandpass delta sig

Details Analog-to-digital converters using multistage bandpass delta sig Analog-to-digital converters using multistage bandpass delta sig

1994-03-14

1996-03-19

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341118, H03M 106, H03M 300

Patent

active

055006450

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 an arbitrary center frequency F.sub.bp. These modulators cascaded with a bandpass digital filter centered at the arbitrary center frequency F.sub.bp perform A/D conversion for high-frequency, narrow-band signals having the same arbitrary frequency. The bandpass modulators are implemented by use of resonators which provide a substantially large gain at the arbitrary frequency.

REFERENCES:
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patent: 5103229 (1992-04-01), Ribner
patent: 5153593 (1992-10-01), Walden et al.
patent: 5283578 (1994-02-01), Ribner et al.
patent: 5414424 (1995-05-01), Cabler
R. Schreier et al., "Bandpass Sigma Delta Modulation", Electronics Letters, vol. 25, No. 23, 9th Nov. 1989, pp. 1560-1561.
Z. X. Zhang et al., "Bandpass A/D Converter Using Two-path Multibit Structure", Electronics Letters, vol. 27, No. 22, 24th Oct. 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.
D. B. Ribner, "A Comparison of Modulator Networks for High-Order Oversampled Sigma-Delta Analog-to-Digital Converters", IEEE Trans. on Circuits and Systems, vol. CAS-38, No. 2, pp. 145-159, Feb. 1991.
D. B. Ribner, R. D. Baertsch, S. L. Garverick, D. T. McGrath, J. E. Krisciunas, T. Fujii, "A Third-Order Multistage Sigma-Delta Modulator with Reduced Sensitivity to Nonidealities", IEEE Journal of Solid-State Circuits, vol. 26, No. 12, Dec. 1991, pp. 1764-1774.

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