High-order, plural-bit-quantization sigma-delta modulators using

Details High-order, plural-bit-quantization sigma-delta modulators using High-order, plural-bit-quantization sigma-delta modulators using

1991-09-09

1993-01-19

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341155, H03M 304

Patent

active

051810328

ABSTRACT:
A high-order sigma-delta modulator has a single feedback loop including a linear network and a quantizer, which quantizer comprises a plural-bit analog-to-digital converter, a digital comparator and a single-bit digital-to-analog converter. The linear network comprises a cascade of integrators, a second-order resonator, a cascade of second-order resonators or a cascade of second-order resonators with an additional integrator. The loop behaves much the same as a conventional single-feedback-loop, one-bit sigma-delta modulator, inasfar as the feedback signal is concerned. However, a plural-bit preliminary output signal is available, so the truncation error can be determined. The truncation error is cancelled in the ultimate output signal from the high-order sigma-delta modulator, using additional digital circuitry having the a transfer function analogous to the overall transfer function for input signal of the cascade connection of the linear network, plural-bit analog-to-digital converter in the quantizer, and any scaling circuitry therein or thereafter.

REFERENCES:
patent: 4186384 (1980-01-01), Acker
patent: 5055843 (1991-10-01), Ferguson, Jr. et al.
patent: 5084702 (1992-01-01), Ribner
patent: 5101205 (1992-03-01), Yasuda
R. Schreir et al., Bandpass Sigma-Delta Modulation, Electronics Letters, vol. 25 No. 23 pp. 1560-1561, Nov. 1989.

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