在做无线通信的项目，采集的信号是差分信号，几十uV到几百uV，选用INA128进行差分转单端，发现信号会时有时无，并且呈现周期性，电路图在附件中。之前也用过ADI的芯片效果也不理想。
请问是否有推荐的微弱信号采集前端电路呀？
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