Digital to analog converter and frequency synthesizer using the

Details Digital to analog converter and frequency synthesizer using the Digital to analog converter and frequency synthesizer using the

1995-01-25

1996-11-12

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, 341153, H03M 168, H03K 1300

Patent

active

055744559

ABSTRACT:
A digital to analog converter which includes a delta-sigma modulator for transforming the lower n bits of an input digital signal of N bits by delta-sigma modulation; first and second signal output devices for outputting first and second signals which are used for selecting current cells of a current cell array according to the higher bits and the higher bits+one LSB of the input digital signal, and a selector for selecting either of the first and second signals in accordance with the change of the output of the delta-sigma modulator. A filter is provided for smoothing the total of the currents output from the current cells which are in the output state corresponding to the first or second signal selected by the signal selector.

REFERENCES:
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patent: 4910514 (1990-03-01), Irmer et al.
patent: 4958159 (1990-09-01), Wyatt
patent: 5146224 (1992-09-01), Kitayoshi
patent: 5162800 (1992-11-01), Ogawara
patent: 5181034 (1993-01-01), Takakura et al.
patent: 5243347 (1993-09-01), Jackson et al.
patent: 5245593 (1993-09-01), Yamate
patent: 5446457 (1995-08-01), Ryat
patent: 5453743 (1995-09-01), Kang

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