Double integral type A/D converter

Details Double integral type A/D converter Double integral type A/D converter

1986-04-29

1988-04-19

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

340347CC, 340347NT, H03M 100

Patent

active

047393050

ABSTRACT:
Herein disclosed is a double integral type A/D converter for converting an analog signal into a digital signal. The A/D converter (includes), as circuit elements an integrator having its one terminal made receptive of one of an unknown input voltage and a reference voltage; a comparator connected with the output of the integrator and including a transistor having its collector or drain opened; and an offset correction circuit connected between the output of the comparator and another terminal of the integrator for feeding back the output of the comparator. The offset correction circuit including a series circuit of a switch, a resistor R.sub.0 and an auto-zero capacitor C.sub.0. The converter also includes a flip-flop made responsive to the output signal of the comparator for switching the operational mode of the integrator from an integration mode to an offset correction mode; and a counter for counting the inverse integration period of the reference voltage. These circuit elements, as recited, are packaged into a hybrid IC.

REFERENCES:
patent: 3747088 (1973-07-01), Pastoriza
patent: 3893103 (1975-07-01), Prill

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