Decision circuit operable at a wide range of voltages

Details Decision circuit operable at a wide range of voltages Decision circuit operable at a wide range of voltages

1994-12-27

1996-08-20

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

326 89, 326126, 327 74, 327 87, 327 89, 327538, H03K 19086

Patent

active

055482279

ABSTRACT:
A decision circuit compares an input voltage with a reference voltage and judges whether the input voltage is at least equal to the reference voltage. A controller in the decision circuit detects whether the input voltage or reference voltage is at least equal to the setting voltage. When both the input voltage and the reference voltage are lower than a setting voltage, which represents an operating voltage of the decision circuit, a first bias-supply circuit adds a predetermined bias voltage to the input voltage and supplies a level-shifted input voltage to the decision circuit. Similarly, a second bias-supply circuit adds the predetermined bias voltage to the reference voltage and supplies a level-shifted reference voltage to the decision circuit. Therefore, the decision circuit compares the level-shifted input voltage with the level-shifted reference voltage.

REFERENCES:
patent: 4456840 (1984-07-01), Ide et al.
patent: 4527076 (1985-07-01), Matsuo et al.
patent: 4560921 (1985-12-01), Yamatake
patent: 4602169 (1986-07-01), Shimizu
patent: 5045807 (1991-09-01), Ishihara et al.
patent: 5291122 (1994-03-01), Audy

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