Double integration analog to digital converting device

Details Double integration analog to digital converting device Double integration analog to digital converting device

1987-05-11

1988-09-13

Sloyan, T. J.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

324 99D, H03M 152

Patent

active

047712651

ABSTRACT:
An analog to digital converting device which can convert analog input signals individually into digital values of accurately corresponding magnitudes even when there is some difference in the input signals. The device comprises an integrating circuit which includes an operational amplifier for receiving an analog signal, an integrating capacitor connected between an input terminal and an output terminal of the operational amplifier, and a reset switch connected in parallel to the integrating capacitor. The integrating circuit is controlled to first perform an integrating operation and then an inverse integrating operation. A comparator is connected to an output terminal of the integrating circuit. A diode or transistor is connected in parallel to the integrating capacitor for limiting an amount of charge to be accumulated in the integrating capacitor by an inverse integrating operation to below a predetermined value.

REFERENCES:
patent: 3710374 (1973-01-01), Kelly

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