Comparator circuit having full supply common mode input

Details Comparator circuit having full supply common mode input Comparator circuit having full supply common mode input

1983-07-01

1985-08-20

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307496, 307491, 307270, 328147, 330257, 330263, H03K 302

Patent

active

045366632

ABSTRACT:
The input voltage signals to a comparison circuit may vary between levels substantial equal to the first and second supply voltages (e.g. typically 5 volts and ground). A first transistor circuit is coupled to a current mirror circuit and to an output node for supplying a mirrorable current to the current mirror circuit which in turn reduces the voltage at the output node when the first input voltage approaches the upper supply voltage, and supplies a current to the output to increase the voltage thereat when the second input approaches the upper supply voltage. A second transistor circuit is also coupled to the current mirror and to the output for supplying a mirrorable current to the current mirror means so as to reduce the voltage at the output when the second input voltage approaches ground, and supplies current to the output to increase the voltage thereat when the first input voltage approaches ground. The output node has coupled thereto a level shifting transistor and first and second follower transistors.

REFERENCES:
patent: 3921008 (1975-11-01), Claverie
patent: 4147944 (1979-04-01), Monticelli
patent: 4345213 (1982-08-01), Schade, Jr.
patent: 4378529 (1983-03-01), Dobkin
patent: 4446385 (1984-05-01), Orengo et al.

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