Solid state digital-to-analog converter

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

1975-12-22

1977-04-26

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1304

Patent

active

040204863

ABSTRACT:
A digital-to-analog converter comprising an IC switch module providing four switch transistors and associated switch-control buffering circuitry. The emitter areas of the switch transistors are binarily weighted to provide equal current densities. The IC substrate also is formed with a fifth transistor to serve as a reference transistor for adjusting the supply voltage as necessary to maintain constant current through the switch transistors. To construct a digital-to-analog converter having a high bit resolution, a number of such "quad" switch modules may be combined, for example in a printed circuit card assembly including a thin-film resistor module providing binarily-weighted resistors on a glass substrate to set the current levels through the switch transistors.

REFERENCES:
patent: 3019426 (1962-01-01), Gilbert
patent: 3475749 (1969-10-01), Plice
patent: 3569960 (1971-03-01), Neiswinter

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