Resistance comparator for switch detection

Details Resistance comparator for switch detection Resistance comparator for switch detection

1982-12-21

1985-05-21

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 330288, H03K 5153, H03K 524

Patent

active

045188696

ABSTRACT:
In a resistance comparator circuit a current mirror provides a reference current to a first conduction path and a mirror current to a second conduction path. A first transistor is coupled in series with the first conduction path and a reference resistance is coupled in series with the first transistor. A second transistor is coupled in series with the second conduction path and an input resistor is placed in series with the second transistors. A bias circuit supplies a bias signal to the control nodes of the first and second transistor. A logic transition occurs when the input resistor is equal to the reference resistor or a predetermined multiple thereof.

REFERENCES:
patent: 3789291 (1974-01-01), Dinger et al.
patent: 3904888 (1975-09-01), Griffin et al.
patent: 4023050 (1977-05-01), Fox et al.
patent: 4059956 (1977-11-01), Baker
patent: 4188588 (1980-02-01), Dingwall
patent: 4249095 (1981-02-01), Hsu
patent: 4322639 (1982-03-01), Yamashiro
patent: 4345172 (1982-08-01), Maeda et al.
patent: 4347440 (1982-08-01), Baker
patent: 4352141 (1982-09-01), Kent

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