Bias current network for IC digital-to-analog converters and the

Details Bias current network for IC digital-to-analog converters and the Bias current network for IC digital-to-analog converters and the

1980-02-12

1982-04-06

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307299B, 307459, 330288, 330257, H03F 3187, H03K 1325

Patent

active

043237959

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: 4096399 (1978-06-01), Davis et al.
patent: 4147944 (1979-04-01), Monticelli
patent: 4194136 (1980-03-01), Butler
patent: 4219782 (1980-08-01), Stein
patent: 4246500 (1981-01-01), Okada et al.

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