Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

1997-07-31

1999-07-06

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, 341118, H03M 166

Patent

active

059202734

ABSTRACT:
A digital-to-analog converting section includes a delta-sigma (.DELTA..SIGMA.) modulator and converts an input digital signal to an analog signal on the basis of delta-sigma modulation of the input digital signal by the delta-sigma modulator. A digital adder is provided, at the input stage of the digital-to-analog converting section, to add an oscillation-preventing direct current value to the input digital signal, and the adder operates to prevent oscillation in the delta-sigma modulating loop when the input digital signal changes from an "input signal present" state to a "no input signal" state. Also, an output buffer is provided, at the output stage of the digital-to-analog converting section, to shift the converted analog signal in response to an offset-adjusting current. Thus, the offset adjustment can be effected without adversely influencing the oscillation-preventing action of D.C. dithers.

REFERENCES:
patent: 5231395 (1993-07-01), Irwin et al.

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