Solid state digital-to-analog converter

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

1981-09-01

1985-03-19

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

307303, 340347CC, 340347M, H03K 1302

Patent

active

RE0318507

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: 3262049 (1966-07-01), Watson et al.
patent: 3475749 (1969-10-01), Plice
patent: 3569960 (1971-03-01), Neiswinter et al.
patent: 3582943 (1971-06-01), Weller
patent: 3588530 (1971-06-01), Langan
patent: 3685045 (1972-08-01), Pastoriza
Rudin et al., System/Circuit Device Considerations, Feb. 15, 1967, International Solid-State Circuits Conference, pp. 16 & 17.
Rudin et al., A Family of Linear Integrated Circuits for Data Systems, 1967 Fall Joint Computer Conference, pp. 95-101.
Fairchild Semiconductor, UA722B 10 Bit Current Source, 1968, 4 pages.
Fairchild Semiconductor, Using the UA722 Precision Current Source, (No Date Listed), 18 pages.
Fairchild Semiconductor, Application of the UA722 10-Bit Current Source, 1968, pp. 1-26.

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