用AD8675做锁相环有源环路滤波时，出现开关机运放锁死（正向端电压1.6V左右，负向端电压0.9V左右）。运放正向端采用两个1KΩ电阻分压给偏置，负向端接电荷泵输出。运放供电15V以下，不会出现这个现象，高于20V以后，出现次数很多。什么原因？？？？急等
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