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峰值采样电路求教!!!

这是我的电流负载采样电路,前面是LPF电路,后面两级组成一个峰值采样电路,仿真时没有问题,线性也挺好,现在打板出来调,LPF输出是OK的,不过会滤掉负半周期,这个没问题,但峰值采样这块就有问题了,在U2的PIN1输出就没有信号了,求教!!!

输入信号是互感器输入,量了第一级LPF输出,峰值在68mV左右