Digital-analog converter, circuit board, electronic device and l

Details Digital-analog converter, circuit board, electronic device and l Digital-analog converter, circuit board, electronic device and l

1998-06-02

2000-12-05

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, H03M 180

Patent

active

061573345

ABSTRACT:
A digital-analog converter, a circuit board, an electronic device, and a liquid crystal display device are provided that make it possible to decrease the number of required resistors and switches and to reduce power consumption. A digital-analog converter that converts plural bits of a digital signal into an analog output, comprises high-potential wiring to which a high potential V.sub.H is supplied, low-potential wiring to which a low potential V.sub.L is supplied, output wiring for obtaining the analog output V.sub.S, a first variable resistance block R1 that is provided between the high-potential wiring and the output wiring and has a variable resistance value, and a second variable resistance block R2 that is provided between the output wiring and the low-potential wiring and has a variable resistance value. A ratio of resistance values of the first and second variable resistance blocks R1 and R2 is represented by a ratio of non-negative integers which are natural numbers, whose total sum is equal to a constant, and that change in increments of one based on the digital signals D0 to D2 increasing or decreasing by a minimum unit.

REFERENCES:
patent: 4701694 (1987-10-01), Penney et al.
patent: 5394146 (1995-02-01), Arimoto
patent: 5614905 (1997-03-01), Crane
patent: 5808576 (1998-09-01), Chloupek et al.

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