Digital-to-analog converter and method for correcting gain mismatch between a first segment and a second segment of a digital-to-analog converter

摘要

A method for correcting gain mismatch between a first segment and a second segment of a digital-to-analog converter is provided. The first segment generates a first contribution to an analog output signal of the digital-to-analog converter based on a first number of bits of a digital input word for the digital-to-analog converter, wherein the second segment generates a second contribution to the analog output signal based on a second number of bits of the digital input word. The method includes extending a numeric range of a second control word for the second segment by a predefined number of bits, wherein the second control word is indicative of the second number of bits. Further, the method includes multiplying the second control word by a correction value that is based on information about a gain error of the first segment. The method additionally includes digitally filtering the multiplied first control word. After the digital filtering, the method further includes reducing the numeric range of the multiplied second control word by the predefined number of bits to generate a modified second control word for the second segment. Additionally, the method includes supplying the modified second control word as input to the second segment.