Comparator circuit

Details Comparator circuit Comparator circuit

1986-02-28

1987-07-14

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307 30, 307 39, 307 62, 307253, 307358, 307573, H03K 524, H03K 1716

Patent

active

046804838

ABSTRACT:
A comparator for sensing a small voltage differential at, or close to, the operating voltage rails includes first and second means for producing first and second currents and for producing a third current which is indicative of the difference between the first and second currents. The first current varies as a linear function of first (e.g. V.sub.IN) and second (e.g. V.sub.O) voltages, the amplitude of the first current being proportional to that one of said first and second voltage having the largest amplitude. The second current varies exponentially as a function of the difference between the first and second voltages. Comparator means embodying the invention are particularly useful in circuits where a transistor-switch couples an input voltage (V.sub.IN) to an output terminal and the transistor-switch is to be turned-off when V.sub.IN drops below the voltage (V.sub.O) at the output terminal. The comparator means of the invention includes means for sensing the input and output voltages, and for deriving currents indicative of the input and output voltage levels. When a current condition is produced indicative of V.sub.O being equal to, or greater than, V.sub.IN, the transistor-switch means is turned-off decoupling the input voltage from the output terminal.

REFERENCES:
patent: 4300063 (1981-11-01), Dunphy et al.
patent: 4446385 (1984-05-01), Orengo et al.

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