Sigma-delta digital-to-analog converter with reduced distortion

Details Sigma-delta digital-to-analog converter with reduced distortion Sigma-delta digital-to-analog converter with reduced distortion

1992-03-30

1993-07-27

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341118, 341144, 341152, H03M 300, H03M 106, H03M 182

Patent

active

052313956

ABSTRACT:
A sigma-delta digital-to-analog converter (20) reduces even order distortion, such as a DC offset, in an output signal by chopping the output signal alternately with set and reset pulses. The sigma-delta digital-to-analog converter (20) includes a sigma-delta modulator (25), a chop circuit (261) associated with a corresponding bit of the sigma-delta modulator (25), and an output buffer (264) for providing the output signal. The chop circuit (261) alternately inserts first and second logic levels into an output data stream of the sigma-delta modulator (25) before providing it to the output buffer (264). Even-order distortion is eliminated with only a tolerable attenuation of the output signal.

REFERENCES:
patent: 4179659 (1979-12-01), Tashiro
patent: 4371972 (1983-02-01), Schwarz et al.
patent: 4897856 (1990-01-01), Cukier et al.
patent: 5028925 (1991-07-01), Ferry et al.
patent: 5057840 (1991-10-01), Ledzius et al.

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