Analog-to-digital converter with expected value nonlinearity calibration

• Main Authors: KUNNEN GEORGE R, LANCASTER MARK A
• Format: Patent
• Language: English
• Published: 22.12.2015
• Subjects: BASIC ELECTRONIC CIRCUITRY; CODE CONVERSION IN GENERAL; CODING; DECODING; ELECTRICITY

A system includes an analog-to-digital converter (ADC) for converting an analog input signal to a digital signal output and a nonlinearity corrector for correcting nonlinear error in the digital signal output to produce a corrected digital signal output. A source of the nonlinear error is associated with the ADC, wherein an analog calibration signal is introduced to the source of the nonlinear error during conversion of the analog calibration signal to a digital calibration output having the nonlinear error. After conversion of the analog calibration signal to the digital calibration output, a calibration circuit calculates expected values of correlation sums in response to the digital calibration output and determines correction coefficients using the expected values of the correlation sums. The calibration circuit provides correction data based upon the correction coefficients to the nonlinearity corrector.