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微弱信号检测试题中用到的相敏检测电路 给了参考电压 调节可调电阻怎么没有反应
输入信号的频率和幅值是多少？
最好有些电路说明, 起码 Vin 和 Vout 是什么样的信号, 什么样的现象, 先说清楚
