Solid state digital to analog converter

Details Solid state digital to analog converter Solid state digital to analog converter

1979-09-04

1982-01-05

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

307264, 307475, 340347M, H03K 1302

Patent

active

043096930

ABSTRACT:
An integrated-circuit 12-bit digital-to-analog converter comprising binarily-scaled constant-current sources with associated switch cells employing bipolar transistors to direct the bit currents either to a summing bus or to ground. The switch cells include a first differential transistor pair to translate a single-ended binary logic signal to double-ended (balanced) format, and a second, fully-balanced differential pair operated by the balanced logic signal to direct the bit current correspondingly. A bias-generating circuit maintains a constant collector-base voltage at the constant-current source. The threshold voltage for the logic signals can be set for TTL logic or, by pin-programming, for CMOS logic of either low-voltage or high-voltage type.

REFERENCES:
patent: 3842412 (1974-10-01), Spofford
patent: 3883865 (1975-05-01), Freeborn
Dooley, A Complete Monolithic 10/Bit D/A Converter, IEEE International Solid-State Circuits Conference, 2/1973, pp. 12-14.
Maddox, Current-Steering Chip Upgrades Performance of D/A Converter, Electronics, 4/1974, pp. 125-130.

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