Electronic circuitry

Details Electronic circuitry Electronic circuitry

1979-11-02

1981-12-29

Chatmon, Jr., Saxfield

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307221C, 307571, 328161, 340347AD, H03K 3353

Patent

active

043084672

ABSTRACT:
An electronic circuit, suitable for use in a digital-to-analog converter, wherein a ladder network is provided to obtain a 2:1 successive reduction in the amount of current flow through successive shunt arms of the ladder network. The ladder network includes a plurality of serially coupled resistance means, at least a portion thereof comprising a resistor and a serially coupled transistor, and a plurality of shunt coupled resistors disposed in the shunt arms of the ladder network. A plurality of pairs of switching transistors, each pair thereof being adapted for coupling to a pair of complmentary switching signals produced in response to a bit of the digital word being converted, each one of the shunt resistors being coupled to a corresponding one of the pairs of switching transistors.

REFERENCES:
patent: 3610960 (1971-10-01), Hofstein
patent: 3976894 (1976-08-01), Perkins, Jr. et al.
patent: 4014238 (1977-03-01), Southard
patent: 4138665 (1979-02-01), Eichelberger et al.
patent: 4197472 (1980-04-01), Aoki et al.
patent: 4213120 (1980-07-01), Buchanan
patent: 4234807 (1980-11-01), Esser et al.

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