Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1982-12-27
1984-06-05
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307362, 307252J, 330257, 330288, 340662, 361 56, 361 91, H03K 5153, H03K 524, H03K 1772
Patent
active
044530927
ABSTRACT:
A comparator circuit which includes a differential pair of transistors forming differential inputs of the comparator and a voltage level shift circuit coupled in series connection path with the emitters of the pair of transistors. The voltage level shift circuit includes an additional transistor having its collector-emitter path connected in series between an output of the comparator and the emitter of the first pair of transistors; a first diode coupled a series-conduction path to the emitter of the second one of the pair of transistors and having an anode connected to the base of the additional transistor; and a second diode coupled between the base and emitter of the additional transistor wherein the effective beta of the additional transistor is reduced to reduce the bias current that would otherwise flow through the first transistor when such transistor is rendered conductive by an applied differential input signal.
REFERENCES:
patent: 3857047 (1974-12-01), Knight
patent: 3988595 (1976-10-01), Eatock
patent: 4147944 (1979-04-01), Monticelli
Bingham Michael D.
Motorola Inc.
Zazworsky John
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