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请教一个关于OPA615峰值保持的问题

Other Parts Discussed in Thread: OPA615, BUF602

最近在做一个基于OPA615的峰值检测模块,用的是数据手册上的电路图,但是调试过后,发现有问题:输出的波形形式是正确的,就是在HOLD脚高电平时为采样,低电平时为保持,频率也是和七脚脉冲频率相同,但是就是保持的峰值不对,一直是1V不变,无论怎样调节输入幅度都不变,电路也检查了很多遍了,没找到问题,想请教一下这是怎么回事,希望能得到解答,谢谢!