Analog to digital conversion with offset cancellation

Details Analog to digital conversion with offset cancellation Analog to digital conversion with offset cancellation

2006-06-13

2006-06-13

Wamsley, Patrick (Department: 2819)

Coded data generation or conversion

Converter calibration or testing

C341S172000

Reexamination Certificate

active

07061413

ABSTRACT:
An analog to digital conversion circuit includes a voltage-to-charge converter coupled to a charge integrator and a comparator. The voltage-to-charge converter is coupled to, and converts the voltage of, an analog signal or one of a set of reference voltages, into an equivalent charge. The charge integrator then adds or subtracts that equivalent charge in an iterative manner based on an output of the comparator. The initial charge of the charge integrator is based on a previous conversion. When plural analog to digital conversion circuits are used the initial charge in each such circuit may be different, as each initial charge serves to automatically compensate for any offset in the output of the circuit.

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