Off-set stabilizer for comparator output

Details Off-set stabilizer for comparator output Off-set stabilizer for comparator output

1990-02-26

1991-07-09

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307491, 307494, H03K 5153

Patent

active

050308505

ABSTRACT:
A stabilized off-set voltage is input as the reference voltage to a comparator. In application to a time-interval meter, the comparator output generates a timing interval which is independent of drift in the initial voltage across the timing capacitor. A precision resistor and operational amplifier charge a capacitor to a voltage which is precisely offset from the initial voltage. The capacitance of the reference capacitor is selected so that substantially no voltage drop is obtained in the reference voltage applied to the comparator during the interval to be measured.

REFERENCES:
patent: 3797894 (1974-03-01), Carp
patent: 3804979 (1974-04-01), Knowles
patent: 4160175 (1979-07-01), Trout
patent: 4217553 (1980-08-01), Winebarger
patent: 4613950 (1986-09-01), Knierim et al.
patent: 4635142 (1987-01-01), Haugland
R. Nutt, "Digital Time Intervalometer," 39 Rev. Sci. Instr. No. 9, pp. 131345.

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