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我想用PGA202和OPA27作为前级缓冲和放大，但是输入级需要600Ω的阻抗匹配，请问平衡输入和非平衡输入时，600Ω匹配分别怎样实现？
1，如果输入为交流信号，可考虑变压器耦合，因为变压器可以改变输入阻抗；
2，在前级加入输入电阻600Ω的三极管；
