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

Claim 0:
1. An analog-to-digital converter (ADC) comprising:
a set of comparators, each comparator of the set of comparators having a first input, a second input and an output, the set of comparators configured to:
receive an analog signal at each of the first inputs;
receive at the second input for each comparator of the set of comparators a respective reference threshold; and
provide comparison results at each output based on the analog signal and the respective reference thresholds;

digitization circuitry having a digitization circuitry input and a digitization circuitry output, the digitization circuitry input is coupled to each of the outputs, and the digitization circuitry is configured to provide a digital output code at the digitization circuitry output based on the comparison results and a mapping; and
calibration circuitry having a first calibration circuitry input, a second calibration circuitry input and a calibration circuitry output, the calibration circuitry configured to:
receive the comparison results at the first calibration circuitry input;
determine if the analog signal is proximate to one of the respective reference thresholds based on the comparison results;
in response to determining the analog signal is proximate to one of the respective reference thresholds, receive ADC values at the second calibration circuitry input, the 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 at the calibration circuitry output if the estimated offset error is greater than an offset error threshold.