Digital-to analog converter having supplementary currents to enh

Details Digital-to analog converter having supplementary currents to enh Digital-to analog converter having supplementary currents to enh

1982-01-21

1983-09-20

Miller, C. D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, H03K 1302

Patent

active

044059167

ABSTRACT:
A bit cell is presented which can provide a small weighted current without loss of switching speed. The bit cell contains a switch which is responsive to an applied control signal to direct the weighted current to an output or to divert it away from the output. Supplementary currents are supplied to the switch to provide sufficient current to the switch to charge and discharge parasitic capacitances of the switch within the switching time of the control voltage. The supplementary currents maximize switching speed at a given power dissipation and produce a constant offset current at the switch output. A D/A converter is presented which utilizes a plurality of such bit cells to maximize the speed of D/A conversion. The offset currents are eliminated from the converter output so that the output current is proportional to the digital input.

REFERENCES:
patent: 4056740 (1977-11-01), Schoeff
patent: 4131884 (1978-12-01), Comer
patent: 4138671 (1979-02-01), Comer
patent: 4309693 (1982-01-01), Craven

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