Hysteresis comparator

Details Hysteresis comparator Hysteresis comparator

1991-04-19

1993-01-26

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307357, 307364, H03K 522

Patent

active

051824710

ABSTRACT:
In a hysteresis comparator for comparing an input Vin1 with another input Vin2, the comparator comprises a pair of first and second transistors. The gate of the first transistor is supplied with the input Vin1 and the gate of the second transistor is supplied with the input Vin2. Their collectors are connected to a power supply. The emitter of the first transistor is connected to a first current source and the emitter of the second transistor is connected to a second current source. The comparator further comprises a circuit for detecting an emitter voltage difference between the first and second transistors and varying at least one of the first and second current sources. Therefore, the hysteresis width can be determined by the collector current ratio of specific transistors, regardless of the absolute values of their collector currents.

REFERENCES:
patent: 4456887 (1984-06-01), Tokumo
patent: 4564281 (1986-01-01), Takemae
patent: 4587444 (1986-05-01), Emori et al.

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