WPAT, PC
Correction method and correction circuit for sigma-delta modulator
A correction method and a correction circuit for a sigma-delta modulator (SDM) are provided. The SDM includes a loop filter, a quantizer, and a digital-to-analog converter (DAC). The correction method includes the following steps: controlling the DAC not to receive the output of the quantizer; controlling the SDM to stop receiving signals; inputting a test signal to the DAC; converting the output of the loop filter to a digital signal; comparing the digital signal with a preset value; and adjusting the loop filter according to the result of comparing the digital signal and the preset value.
REALTEK SEMICONDUCTOR CORPORATION
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Yu-Chang Shih-Hsiung Chih-Lung Jie-Fan
Chen Huang Chen Lai