Chopper type comparator

Details Chopper type comparator Chopper type comparator

1991-02-07

1992-10-06

Mis, David

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307240, 307356, H03K 524, H03K 1756

Patent

active

051534541

ABSTRACT:
A chopper type comparator, for comparing a first analog input signal voltage and a second analog input signal voltage to each other, includes an input portion for inputting the first and second analog input signals, respectively, and selectively outputting the first and second analog input signals, and a comparison portion for providing a result of comparison of the first and second analog input signals. The comparison portion includes a capacitor connected to a selected output of the input means at one terminal of the capacitor, an inverter having an MOS FET and of which an input side thereof connected to the other terminal of the capacitor, a path connected in parallel between the input and an output of the inverter across a analog switch, a switch control portion for controlling an electrical connection state of the analog switch in response to selection of the output of the input portion, the analog switch having a suppressing portion for suppressing transmission of a voltage variation to the input side of the inverter from the output side thereof across the analog switch.

REFERENCES:
patent: 4075509 (1978-02-01), Redfern
patent: 4890014 (1989-12-01), Ramet

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