Chip and calibration method thereof

摘要

A calibration method includes generating, by a digital-to-analog converter of a chip, a first predetermined voltage and a second predetermined voltage and outputting the same to an analog-to-digital-converter of the chip to generate a first digital code difference; determining a variation parameter according to the first digital code difference and one of a plurality of second digital code differences stored in a look up table of a memory unit of the chip; driving, by an external testing system, the digital-to-analog converter to generate the first predetermined voltage and the second predetermined voltage and output the same to the analog-to-digital-converter to generate a target code difference; and multiplying the second digital code differences with the variation parameter to calibrate a gain of the analog-to-digital converter according to the target code difference.

主权项

1. A chip, comprising:
an analog-to-digital converter; a memory unit configured to store a look up table, wherein the look up table is configured to store a plurality of first digital code differences, and is configured to be calibrated according to a variation parameter, wherein the first digital code differences are generated, according to a first predetermined voltage and a second predetermined voltage, by the analog-to-digital converter at a plurality of gains respectively; and a digital-to-analog converter configured to generate the first predetermined voltage and the second predetermined voltage and output the same to the analog-to-digital converter to measure a second digital code difference generated by the analog-to-digital converter at a first gain among the plurality of the gains; wherein the variation parameter is a ratio of the second digital code difference and one of the first digital code differences.