Reference voltage generating circuit, and A/D and D/A converters

Details Reference voltage generating circuit, and A/D and D/A converters Reference voltage generating circuit, and A/D and D/A converters

1991-03-07

1992-11-03

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341155, 341158, 341144, H03M 100

Patent

active

051609304

ABSTRACT:
A reference voltage generating circuit is disclosed which generates a plurality of linear analog voltages and is desirably applied to A/D and D/A converters. As the reference voltage generating circuit itself or a resistor network comprised therein, a resistor network is employed which comprises a plurality of resistor elements connected in series between two power sources and resistor networks (or resistor elements) connected to all the other nodes than the two nodes closest to the two power sources, respectively, out of the nodes between the former resistor elements. The above-mentioned plurality of resistor elements have the same resistance value r and the output impedance (or resistance value) of the resistor networks (or resistor elements) connected to all the nodes above is set to a value twice the resistance value r of the above-mentioned resistor elements, or 2r. Accordingly, output impedance at any of the nodes between said plurality of resistor elements represents 2.multidot.r/3. A a result, inequality of output impedances between the output terminals of the reference voltage generating circuit can be improved.

REFERENCES:
patent: 4496935 (1985-01-01), Inoue et al.
patent: 4612531 (1986-09-01), Dingwall et al.
patent: 4804940 (1989-02-01), Takigawa et al.
patent: 4990917 (1991-02-01), Kohdaka
patent: 5021785 (1991-06-01), Kohdaka et al.
1985 Digest of Technical Papers, IEEE International Solid State Circuits Conference Feb. 13, 1985, pp. 72-73, 308, 309.

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