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DDS9959后接放大电路



9959后面接上一个三极管共射放大电路,9959输出20mV的正弦波,当后级电路的电阻实时发生变化时,DDS输出的波会从一个很大的直流偏置处开始下移至正常位置,有什么可能的原因吗