Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1975-07-14
1976-08-31
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
307303, 307297, H03K 1304
Patent
active
039784738
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: 3401386 (1968-09-01), Yanishevsky
patent: 3495237 (1970-02-01), Corre
patent: 3582943 (1971-06-01), Weller
patent: 3617778 (1971-11-01), Korom
patent: 3651517 (1972-03-01), Kurek
patent: 3699568 (1972-10-01), Thompson
Analog Devices Inc.
Miller Charles D.
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