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有关功率放大器的问题

Other Parts Discussed in Thread: BUF634, THS3091, THS3001, THS4221, VCA810

AD603构成的3自动增益放大电路与AD811,BUF634构成的功率放大电路直接耦合,级间有51欧姆电阻接地,输出信号却严重失真。级间再串入一个电阻问题得到缓解,但是输出信号幅值大幅减小。怎么解决?