Patent ID: 7924209
Filing Date: 2011-04-12
Classification: H03M

Abstract:
1. A self-calibration circuit for capacitors, comprising: a reference capacitor, coupled between a common terminal and a first input terminal; a calibration circuit, coupled to the reference capacitor and the capacitor array, and the calibration circuit comparing capacitances of the reference capacitor and the capacitor array to generate a parameter for determining conducting states of the first switches of the first switch set, so as to adjust a parallel connection relation between the compensation capacitors and the target capacitor for calibrating the capacitance of the capacitor array; a counting unit, coupled to the calibration circuit and the first switch set, for temporarily store the parameters corresponding to the conducting states of the first switches, wherein the calibration circuit repeatedly compares the capacitances of the reference capacitor and the capacitor array to generate a plurality of parameters, and the counting unit accumulates the parameters and calculates an average of the parameters to output a final parameter, so as to determine the conducting states of the first switches of the first switch set for calibrating the capacitance of the capacitor array.