High resolution auto-zero circuit for analog-to-digital converte

Details High resolution auto-zero circuit for analog-to-digital converte High resolution auto-zero circuit for analog-to-digital converte

1977-05-27

1979-03-06

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347M, H03K 1320

Patent

active

041433629

ABSTRACT:
An analog-to-digital converter includes an integrator which includes an amplifier having an offset voltage. A counter is responsive to a counter clock signal for counting during the duration of a first integration and transferring its count at the end of the first integration to a storage circuit. The counter is then reset. It then counts during the duration of a second integration. Coincidence circuitry is provided which causes the counter to be reset during the second integration when its count matches the count stored in the storage circuit. The counter then continues counting until the end of the second integration. The uncertainty associated with the count stored in the counter at the end of the second integration is improved by provision of a circuit responsive to the comparison signal and first and second clock signals for producing the counter clock signal. The counter clock signal is produced such that it is in phase with the first clock signal if the comparison signal at the end of the first integration occurred before the beginning of a subsequent pulse of the second clock signal. Otherwise, the third clock signal is delayed so that it is temporarily in phase with the second clock signal.

REFERENCES:
patent: 3942173 (1976-03-01), Wold

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