Analog-to-digital converting device and related calibration method and calibration module

摘要

An analog-to-digital converting device includes a converting module, for sampling an analog input voltage according to a plurality of sampling signals to generate a comparing voltage and generating a comparing signal according to the comparing voltage, wherein the converting module comprises a plurality of capacitors and each of the plurality of capacitors couples between one of the plurality sampling signals and the comparing voltage; a control module, for adjusting the plurality of sampling signals according to the comparing signal, to generate a digital signal corresponding to the analog input voltage, wherein a plurality of bits of the digital signal are respectively corresponding to the capacitances of the plurality of capacitors; and a calibration module, for adjusting the capacitances of the plurality of capacitors according to the digital signal.

主权项

1. An analog-to-digital converting device, comprising:
a converting module, for sampling an analog input voltage to generate a comparing voltage according to a plurality of sampling signals and generating a comparing signal according to the comparing voltage, wherein the converting module comprises a plurality of capacitors and each of the plurality of capacitors couples between one of the plurality sampling signals and the comparing voltage; a control module, for adjusting the plurality of sampling signals according to the comparing signal, to generate a digital signal corresponding to the analog input voltage, wherein a plurality of bits of the digital signal respectively are corresponding to capacitances of the plurality of capacitors except the least significant bit among the plurality of bits; and a calibration module, for adjusting the capacitances of a first capacitor among the plurality of capacitors when a number of times that the digital signal equals a pattern exceeds a threshold; wherein a first bit among the plurality of bits in the pattern is different from the bits between the first bit and the least significant bit of the plurality of bits in the pattern and the first bit is corresponding to the first capacitor.