Window comparator

Details Window comparator Window comparator

1997-10-17

1999-10-05

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 77, 327 89, H03K 5153

Patent

active

059630620

ABSTRACT:
A window comparator includes a differential circuit stage and a load circuit stage. The differential circuit stage produces a pair of differential currents from an input voltage, the differential currents varying depending on the input voltage with having a maximum and a minimum when the input voltage is a reference voltage. The load circuit stage produces an output voltage from a reference current and a current corresponding to a selected on of the differential currents. The reference current and the current are produced such that a voltage range is determined around the predetermined voltage depending on whether the second current is greater than the reference current. Since a window of the window comparator is formed based on the current and the reference current, the output voltage changes in level depending on whether the input voltage falls into the voltage range.

REFERENCES:
patent: 4047059 (1977-09-01), Rosenthal
patent: 4185212 (1980-01-01), Leidich
patent: 4300063 (1981-11-01), Dunphy et al.
patent: 4409497 (1983-10-01), Nagano
patent: 4529891 (1985-07-01), Oida
patent: 4871979 (1989-10-01), Shearer et al.
patent: 5066876 (1991-11-01), Fukuda et al.

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