Level shifting circuit

Details Level shifting circuit Level shifting circuit

1978-04-03

1980-01-22

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307255, 307296R, 307264, H03K 1700

Patent

active

041852125

ABSTRACT:
A voltage comparator comprising first and second transistors of a first conductivity type receiving a current at an interconnection of their emitter electrodes has the collector of the first transistor connected to the base of a third transistor of a second conductivity type complementary to the first. Reference and bias potentials are applied respectively to the emitter of the third transistor and to the base of the second transistor; and input signal voltages to be compared to the bias potential are applied to the base of the first transistor. Input voltage swings to the reference potential are prevented from depriving the first transistor of sufficient collector potential to support flow of current from its collector to the base of the third transistor. This is done by inserting resistance between the source of input voltage and the base of the first transistor.

REFERENCES:
patent: 3636384 (1972-01-01), Dewitt
patent: 4027177 (1977-05-01), Davis

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