PNP comparator circuit having beta current error cancellation

Details PNP comparator circuit having beta current error cancellation PNP comparator circuit having beta current error cancellation

1982-12-27

1985-06-04

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307491, 330257, 330288, H03K 5153, H03K 524, H03K 1772

Patent

active

045216975

ABSTRACT:
A comparator circuit comprising a pair of PNP input transistors having their collector-emitter paths coupled between first and second conductors. The output of the comparator is coupled to the base of a PNP transistor. The inputs of the comparator are coupled to the bases of the pair of PNP transistors and receive differential input signals thereat. A resistive element is connected between the input and base of one of the pair of transistors to produce an offset voltage which cancels any offset voltage produced at the input of the comparator caused by an error current that flows through the other one of the pair of transistors. The error current is due to base current flow from the PNP transistor that is connected to the output of the comparator.

REFERENCES:
patent: 4418290 (1983-11-01), Nagano

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