Digital-to-analog converter

Details Digital-to-analog converter Digital-to-analog converter

1981-12-11

1983-09-13

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

044045468

ABSTRACT:
An integrating digital-to-analog converter circuit includes an operational-amplifier based integrator, a plurality of constant current sources each providing constant current at a respective different level, and a plurality of switches each associated with a respective current source for coupling the same to the integrator. A plurality of digital counters are arranged to hold a predetermined portion of an n-bit digital word loaded therein and to count clock pulses until their contents reach a predetermined count. At those times, a carry pulse is generated in each such digital counter and the associated switch is opened to cut off the associated current source. Such a digital-to-analog converter circuit can convert data words of relatively high bit length without the need for an excessively high frequency clocking signal.

REFERENCES:
patent: 3646545 (1972-02-01), Maydan
patent: 3999181 (1976-12-01), Hirsch
patent: 4258355 (1981-03-01), Edwards

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