Patent ID: 7085663

Claim:
An integrated circuit comprising: (a) an analog-to-digital converter that converts a measured analog voltage amplitude to an uncorrected digital value, wherein the measured analog voltage amplitude and the uncorrected digital value define a point on an uncorrected transfer function of the analog-to-digital converter, and wherein the uncorrected transfer function has a second derivative; and (b) a calibration circuit that receives the uncorrected digital value and outputs a corrected digital value, wherein the uncorrected digital value is associated with a linear segment that passes through a segment endpoint on the uncorrected transfer function, wherein the segment endpoint is located on the uncorrected transfer function at a local maximum of the second derivative of the uncorrected transfer function, wherein the segment endpoint has an endpoint digital value, and wherein the calibration circuit calculates the corrected digital value by subtracting the endpoint digital value from the uncorrected digital value.