Patent ID: 11955984
Assignee: TEXAS INSTRUMENTS INCORPORATED
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A an analog-to-digital converter (ADC) comprising:
a first set of comparators configured to receive an analog signal and to provide first comparison results based on the analog signal and respective reference thresholds for comparators of the first set of comparators;
digitization circuitry coupled to an output of the first set of comparators and configured to provide a digital output code based on the comparison results and a mapping;
a second set of comparators configured to receive the analog signal and to provide second comparison results based on the analog signal and respective reference thresholds for comparators of the second set of comparators; and
calibration circuitry coupled to the first set of comparators and the second set of comparators, the calibration circuitry configured to:
receive the first and second comparison results;
determine if the analog signal is proximate to one of the respective reference thresholds based on the first and second comparison results;
in response to determining the analog signal is proximate to one of the respective reference thresholds, obtain ADC values based on different pseudorandom binary sequence (PRBS) values being applied to the analog signal;
estimate an offset error based on the ADC values; and
provide a comparator input offset calibration signal for at least one comparator of the set of comparators responsive to the estimated offset error being greater than an offset error threshold.