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US 11,909,410 B2Granted
Sigma-delta analog-to-digital converter circuit with real time correction for digital-to-analog converter mismatch error
AssigneeSTMicroelectronics International N.V.
InventorsAnkur Bal, Sharad Gupta
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Abstract
An estimate of unit current element mismatch error in a digital to analog converter circuit is obtained through a correlation process. Unit current elements of the digital to analog converter circuit are actuated by bits of a thermometer coded signal generated in response to a quantization output signal. A correlation circuit generates the estimates of the unit current element mismatch error from a correlation of a first signal derived from the thermometer coded signal and a second signal derived from the quantization output signal.
Claims20
A method, comprising:
- generating a thermometer coded signal in response to a quantization output signal;
- wherein bits of the thermometer coded signal control actuation of unit current elements within a digital to analog converter circuit;
- generating a first matrix from correlations between bits in a first signal derived from the thermometer coded signal and corresponding bits in a second signal derived from the quantization output signal;
- generating a second matrix from correlations between all of the bits in the first signal;
- and
- multiplying the first matrix by the second matrix to generate a third matrix containing estimates of unit current element mismatch error.
3 more elements
A method, comprising:
- generating a quantization output signal;
- generating a thermometer coded signal in response to the quantization output signal;
- actuating unit current elements of a digital to analog converter (DAC) circuit in response to bits of the thermometer coded signal;
- and
- estimating unit current element mismatch error in the digital to analog converter circuit by:
- performing a first correlation between bits of a first signal derived from the thermometer coded signal and corresponding bits of a second signal derived from the quantization output signal;
- performing a second correlation between all bits of the second signal;
- and
- multiplying a result of the first correlation by a result of the second correlation to generate estimates of unit current element mismatch error.
6 more elements
Dependencies are inferred from the claim text.