Digital-to-analog converter

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

1984-05-11

1985-01-08

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, H03K 1305

Patent

active

044929544

ABSTRACT:
A digital-to-analog conversion circuitry is provided wherein a switching network is adapted to couple, or decouple, a selected one, or ones, of a plurality of identical current sources to, or from, an output bus selectively in accordance with the digital word being converted to produce an output current through an output bus having a level related to such digital word. The switching network includes: a logic network for selectively combining the plurality of bits of the digital word to produce a plurality of control signals, at least one thereof being related to a plurality of the bits of the digital word; and, a plurality of switching transistors, each one thereof having: a control (or base) electrode coupled to a corresponding one of the plurality of control signals; a first (or emitter) electrode coupled to a corresponding one of the plurality of identical current sources; and a second (or collector) electrode coupled to the output bus, such current source being coupled to, or decoupled from, such output bus selectively in accordance with the control signal fed to the control electrode of the transistor coupled to such current source, the logic network produces the plurality of control signals with substantially equal switching level variations.

REFERENCES:
patent: 3217147 (1965-11-01), Chapman, Jr.
patent: 3961326 (1976-06-01), Craven
patent: 4045793 (1977-08-01), Moench
patent: 4092639 (1978-05-01), Schoeff
patent: 4295063 (1981-10-01), Price, Jr.
patent: 4336528 (1982-06-01), Kane

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