电路图如上，是手册里的图48。我只要检测负峰值，所以我的电路去掉了红色部分，其他参数都一样。接入电源后，没有接输入信号和控制信号，输出为1.35伏左右。接入1MHz 3Vpp信号和1MHz 2.6V的脉冲信号后，输出电压不变。这是为什么？
1脚—IQ Adjust 脚接300欧的电阻
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