Oversampling digital-to-analog converter with auto-muting featur

Details Oversampling digital-to-analog converter with auto-muting featur Oversampling digital-to-analog converter with auto-muting featur

1995-12-22

1997-10-28

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341 77, H03M 300

Patent

active

056821620

ABSTRACT:
An oversampling digital-to-analog converter is provided with an auto-muting circuit which reduces noise in an analog output signal when a digital input signal remains at zero. Auto-muting circuit includes an input reference level code detection section which detects an input reference level code in the digital input signal. An output reference level code in a modulated output generated from an oversampling modulator is detected by an output reference level code detection section provided in the auto-muting circuit. A modulated output alteration section is provided which operates in response to the result of the detections to selectively pass the modulated output without any alteration or alter the modulated output by substituting it with output reference level codes.

REFERENCES:
patent: 4812815 (1989-03-01), Miyakoshi et al.
patent: 5200750 (1993-04-01), Fushiki et al.
Diagram of Burr-Brown PCM1710U, Dual Voltage Output CMOS Delta-Sigma DAC with On-Chip Digital Filter, Apr. 1994.

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