Differential voltage digital-to-analog converter

Details Differential voltage digital-to-analog converter Differential voltage digital-to-analog converter

1998-09-23

2000-12-19

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341154, H03M 166

Patent

active

061632899

ABSTRACT:
A digital-to-analog converter with differential output voltage includes a resistor string with high and low reference voltages end nodes and with nodes located between adjacent resistors of the string, first switches of a first analog multiplexer for deriving first divided voltages from first nodes of the resistor string, second switches of a second analog multiplexer for deriving second divided voltages from second nodes of the resistor string, and a decoder device receiving a digital signal. The decoder device is coupled to the first switches for selecting the first switches according to a first code derived from a first bit portion of the digital signal, and the decoder device is coupled to the second switches for selecting the second switches according to a second code derived from a second bit portion of the digital signal different to the first bit portion, whereby a selected first divided voltage and a selected second divided voltage define a selected differential output voltage of the converter. The decoder device includes two separate decoders each for deriving the first and second codes, and the first multiplexer and second multiplexer are switched only one at a time.

REFERENCES:
patent: 5014054 (1991-05-01), Oshita et al.
patent: 5126740 (1992-06-01), Kawada
patent: 5568146 (1996-10-01), Park

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