我用msp430G2553的adc直接采样双电源电路的输出值。
双电源电路通过一个放大器输出偏置为0的正弦波。我用430的adc引脚直接接上这个输出。
如果正弦波幅值较小，就会出现半波。
但是如果正弦波幅值较大时，在半波本该为零的地方出现高频的震荡。
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