Digital-to-analog converter having single-ended input interface

Details Digital-to-analog converter having single-ended input interface Digital-to-analog converter having single-ended input interface

1981-04-03

1983-12-27

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

307299A, 307318, 307456, 328135, 340347M, H03K 1302

Patent

active

044234090

ABSTRACT:
A digital-to-analog converter circuit includes an open-loop reference circuit for regulating a plurality of bit switch currents and utilizes a high-speed single-ended input interface network for level shifting digital input signals to the bit switches whereat the level shifted input signals switch against a substantially fixed threshold voltage. The single-ended input interface network includes a PNP input transistor coupled to an input terminal and coupled by a resistor to a regulated voltage. The PNP input transistor is coupled to a level shifting network including an emitter follower transistor and a zener junction biased by a current source. The threshold voltage is also developed by a level shifting network that includes a zener junction for compensating variations within the level shifting network of the single-ended input interface network.

REFERENCES:
patent: 3519849 (1970-07-01), Tyler
patent: 3961326 (1976-06-01), Craven
patent: 3963919 (1976-06-01), Sells
patent: 4032796 (1977-06-01), Fulkerson
patent: 4110775 (1978-08-01), Festa
patent: 4306159 (1981-12-01), Wiedmann
Dooley, A Complete Monolithic 10-BIT D/A Converter, 2/1973 IEEE International Solid-State Circuits Conference, pp. 12-13 & 192.

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