Single-supply IC digital-to-analog converter for use with microp

Details Single-supply IC digital-to-analog converter for use with microp Single-supply IC digital-to-analog converter for use with microp

1981-12-07

1984-11-20

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330297, H03F 134

Patent

active

044841493

ABSTRACT:
A single-chip 8-bit DAC with bipolar current sources, an output buffer amplifier for developing an output voltage, a regulated reference for producing a calibrated output, and operated by a single-voltage supply, e.g. +5 volts. The buffer amplifier includes means providing for driving the output voltage virtually to ground level when the DAC output is zero. The current sources comprise a single-transistor cell driven by an I.sup.2 L flip-flop circuit, and the reference supply is merged with the reference transistor circuit regulating the DAC current levels, both aiding in reducing required chip area. A highly efficient bias network is utilized to supply the high-level bias currents required.

REFERENCES:
patent: 4087759 (1978-05-01), Iwamatsu
patent: 4236120 (1980-11-01), White
patent: 4286227 (1981-08-01), Sato

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