Comparison circuit having bidirectional hysteresis

Details Comparison circuit having bidirectional hysteresis Comparison circuit having bidirectional hysteresis

1978-12-08

1981-03-31

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307290, H03K 5153, H03K 3295

Patent

active

042596017

ABSTRACT:
A monolithic integrated comparator amplifier is provided for comparing an input signal to a nominal reference voltage to produce an output signal only when the input signal is less than the magnitude of the nominal reference voltage. Bidirectional hysteresis is introduced into the amplifier circuit by reducing the magnitude of the nominal reference voltage when the magnitude of the input signal becomes substantially equal to or greater than the nominal reference voltage produced when the amplifier is in a nominal operating state. The magnitude of the reference voltage is controlled by using a feedback switching transistor to vary the resistance of a resistive divider to decrease the reference voltage produced thereby.

REFERENCES:
patent: 3628059 (1971-12-01), Niu
patent: 4104547 (1978-08-01), Frederiksen et al.

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