Low cost AGC function for multiple approximation A/D converters

Details Low cost AGC function for multiple approximation A/D converters Low cost AGC function for multiple approximation A/D converters

1991-06-27

1993-04-27

Hoff, Marc

Coded data generation or conversion

Analog to or from digital conversion

Nonlinear

341156, H03M 118

Patent

active

052066479

ABSTRACT:
An automatically gain controlled multiple approximation analog to digital converter including a gain controlled amplifier responsive to the difference between an analog input signal and an analog version of a digital approximation of the analog input signal for providing a gain controlled analog residue signal, a quantizer for converting the gain controlled analog residue signal to a gain controlled digital residue signal, a digital divide circuit for dividing the gain controlled digital residue signal by a factor representative of the gain contained therein to provide a restored digital residue signal representative of the analog residue signal before it was amplified by the gain controlled amplifier, and a summing circuit for adding the restored digital residue signal and the digital approximation to provide the output of the gain controlled analog to digital converter. The gain controlled amplifier and the divide circuit are controlled by a gain control circuit that tends to maintain the output of the quantizer between first and second thresholds. Circuitry for providing the digital approximation of the analog input signal can include a linear predictor, or a sample and hold circuit and a coarse quantizer, for example.

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patent: 4851842 (1989-07-01), Iwamatsu
patent: 4875048 (1989-10-01), Shimizu et al.
patent: 4896155 (1990-01-01), Craiglow

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