Digital-to-analog converter

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

1982-09-10

1985-09-03

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

045395527

ABSTRACT:
A digital-to-analog signal converter (1000) provides an analog output signal by subtracting bit currents reflecting a digital input signal from a constant current source (1004, 1018-1022) at a current summer (1003), with the difference current being applied to a constant load. The subtracting of the current, rather than switching the current, avoids the modulation of an associated power source since the total current demand remains the same. In that low power operation is possible, the converter is particularly suited for use in an arrangement where only a low level of operating current is available from a power source.

REFERENCES:
patent: 3290671 (1966-12-01), Lamoureux
patent: 3474440 (1969-10-01), Schmid
patent: 3581303 (1971-05-01), Kelly
patent: 3685045 (1972-08-01), Pastoriza
patent: 3714599 (1973-01-01), Cecil
patent: 3717777 (1973-02-01), Cecil
patent: 3961326 (1976-06-01), Craven
patent: 4184151 (1980-01-01), Iwata
Baum, "IBM Technical Disclosure Bulletin", vol. 12, No. 1, Jun. 1969, p. 82.

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