Sigma-delta analog to digital converter

Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder

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Details

341155, H03M 112

Patent

active

053920392

ABSTRACT:
An analog-to-digital converter has an input for receiving analog signals, a quantizer for producing a digital output of the converter, a first combining node for combining the analog input with a first feedback signal derived from the digital output and producing a first combined signal, and filter circuitry for filtering the first combined signal. The filter circuitry includes at least one filter circuit stage which is not connected to a phase-modifying resistance, and a second combining node for combining an output from the at least one filter circuit stage with a second feedback signal derived from the digital output, and produces a signal for input to the quantizer.

REFERENCES:
patent: 4571560 (1986-02-01), Dobrovolny
patent: 4857928 (1989-08-01), Gailus et al.
patent: 5027120 (1991-06-01), Thurston

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