.DELTA..SIGMA. digital-to-analog converter with bit grouping by

Details .DELTA..SIGMA. digital-to-analog converter with bit grouping by .DELTA..SIGMA. digital-to-analog converter with bit grouping by

1990-07-10

1992-01-07

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341144, 375 28, H03M 302

Patent

active

050795511

ABSTRACT:
A .DELTA..SIGMA. modulation type 1-bit digital-to-analog conversion circuit includes an addition circuit for adding feedback digital data to input multi-bit digital data to provide results of addition, an integration circuit for integrating the results of addition provided by the addition circuit, a quantizer for quantizing output of the integration circuit to provide 1-bit digital data, and a circuit for providing analog data corresponding to the input multi-bit digital data on the basis of the 1-bit digital data. A bit of a predetermined order and bits of orders lower than the predetermined order in the feedback data are respectively made zero and bits of orders higher than the predetermined order only in the feedback data are added by the addition circuit. By feeding back only high order bits of feedback data for addition, the feedback addition is simplified and computation time thereby is shortened.

REFERENCES:
patent: 4301446 (1981-11-01), Petit
patent: 4467316 (1984-08-01), Musmann et al.
patent: 4580128 (1986-04-01), Ogita et al.
patent: 4588981 (1986-05-01), Senn
patent: 4593271 (1986-06-01), Candy
patent: 4652858 (1987-03-01), Kokubo et al.
patent: 4733219 (1988-03-01), Reusens et al.
patent: 4901077 (1990-02-01), Christopher

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