Signal comparing circuit

Details Signal comparing circuit Signal comparing circuit

1983-04-28

1986-07-22

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307355, 307362, 455134, H03K 524

Patent

active

046021698

ABSTRACT:
A signal comparing circuit includes a differential amplifier in which first and second amplifier input signals derived from respective circuit input signals are compared with each other to provide an output signal the level of which depends on the relative levels of the amplifier input signals, and the signal comparing circuit has a hysteresis width, which is defined as a range of relative levels of the input signals within which the output signal level does not change. A variable gain attenuator circuit is connected to the differential amplifier at an input thereof and includes a switching circuit that changes the circuit gain in response to changes in the output signal level. The attenuator circuit gain changes so that at least one amplifier input signal is provided at two levels, with the difference between such two levels depending on the level of at least one of the circuit inputs. The attenuator circuit thus varies the hysteresis width in response to said at least one circuit input signal level.

REFERENCES:
patent: 3628059 (1971-12-01), Niu
patent: 4384219 (1983-05-01), Davis

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