Integrable circuit for digital-to-analog converter

Details Integrable circuit for digital-to-analog converter Integrable circuit for digital-to-analog converter

1982-12-09

1986-02-25

Chin, Gary

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03M 100

Patent

active

045730369

ABSTRACT:
Integrable circuit for digital/analog converters wherein individual signal inputs addressed by part of a digital signal to be processed are connected to the same first terminal of a respective first diode, the first diode having a second terminal connected to the same terminal of a respective second diode and, furthermore, connected to an output of a transistor operated as a current source, the second diode of the diode pairs controlled by the individual signal inputs having a second terminal for jointly controlling an output amplifier, wherein the original current source transistors have respective current-carrying inputs addressed, via a respective resistor, by a common supply terminal, and wherein the individual diode pairs are mutually identical, and the current source transistors are of the same type, comprising at least one second current source transistor operatively associated with each of the first-mentioned current source transistors, both of said first mentioned and said second source transistors having current input electrodes, respectively, directly connected to one another, and current output electrodes of respective mutually associated pairs of said first-mentioned and said second current source transistors connected to a respective one of two identical digitally controlled circuit parts forming, together with resistances connected to said current input electrodes of the respective current source transistors, respective analog/digital converters.

REFERENCES:
patent: 3474440 (1969-10-01), Schmid
patent: 3961326 (1976-06-01), Craven
patent: 4384274 (1983-05-01), Mao
patent: 4408190 (1983-10-01), Nagano
RCA Technical Notes "Voltage Matching Circuit for Ladder Network" Oho Schade, Jr., Mar. 4, 1981.

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