Limited amplitude signal trigger circuit

Details Limited amplitude signal trigger circuit Limited amplitude signal trigger circuit

1991-02-01

1992-03-17

Pascal, Robert J.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307360, 328146, 328150, H03K 500

Patent

active

050971476

ABSTRACT:
A trigger circuit (20, 50, 80, 90, 100) suitable for triggering an oscilloscope on the occurrence of a limited amplitude input signal includes a first comparator (38) for comparing an input signal to a first, low threshold voltage and for generating a first logic signal, and a second comparator (40) for comparing the input signal to a second, high threshold voltage and for generating a second logic signal. The first and second logic signals are combined in a flip-flop circuit (25) to provided an output logic signal such that the output signal changes logic state subsequent to the input signal crossing and recrossing the first, low threshold voltage without crossing the second, high threshold voltage.

REFERENCES:
patent: 4352999 (1982-10-01), Galpin
patent: 4524291 (1985-06-01), Lehning

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