Digital-to-analog converter for reducing occupied area thereof

Details Digital-to-analog converter for reducing occupied area thereof Digital-to-analog converter for reducing occupied area thereof

1994-11-02

1996-10-22

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, H03M 168

Patent

active

055681476

ABSTRACT:
A D/A converter has a first partial circuit, and second and third partial circuits connected with said first partial circuit. The first partial circuit has a first row of K resistors of the same resistance value and groups of switches provided for the resistors, to select "K-1" resistors among said K resistors and connect said selected resistors in series with said second and third partial circuits. The second partial circuit has a second row of L resistors, a first group of switches connected in series with said resistors, respectively, and a second group of switches connected in parallel with said series-connected second row of resistors and said first group of switches, respectively. The third partial circuit has a third row of L resistors, a third group of switches connected in series with said resistors, respectively, and a fourth group of switches connected in parallel with said series-connected third row of resistors and said third group of switches, respectively. Therefore, the D/A converter can reduces an occupied area thereof, and increases the number of D/A converter chips to be fabricated on a wafer, to thereby reduce the costs of the D/A converters.

REFERENCES:
patent: 3273143 (1966-09-01), Wasserman
patent: 4742329 (1988-05-01), Yamada et al.
patent: 5126740 (1992-06-01), Kawada
patent: 5252975 (1993-10-01), Yuasa et al.

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