Comparator circuit with offset correction

Details Comparator circuit with offset correction Comparator circuit with offset correction

1979-11-16

1982-05-04

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

328162, H03K 5153

Patent

active

043284345

ABSTRACT:
A comparator circuit having offset correction circuitry for use in an analog-to-digital converter. The first input of the comparator circuit is periodically connected to ground. The second input of the comparator circuit is connected through a capacitance to ground. The offset voltage generated within the comparator circuit can be considered as being present at the first input. When the offset voltage at the first input is greater than the voltage at the second input a fixed increment of electrical charge is added to the capacitance. When it is less, a fixed increment of electrical charge is subtracted from the capacitance. Thus, increments of electrical charge are accumulated in the capacitance producing a compensating voltage thereacross to correct for the offset voltage.

REFERENCES:
patent: 3200338 (1965-08-01), Ellis
patent: 3541328 (1970-11-01), Beall
patent: 3654560 (1972-04-01), Cath et al.
patent: 4255715 (1981-03-01), Cooperman

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