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adc12d1600 给一个高电平信号之后,SFDR质量变好了,是什么原因?

如题,在上电之后,采集到一组数据,SFDR只有30dB,但是,这时候给一个高电平信号,如10dbm,再将信号电平调回之前的电平,重新采集一组数据,这次SFDR可以达到手册上的50多60dB。这个高电平信号对ADC改变了什么?