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电路连接看起来正常。我没有看到U56的任何本地去耦/旁路电容器,它位于示意图的其他地方吗?
CFB(25pF)是否可能完全滤除放大器的输出?
Achieve High SNR with the PGA855, Fully Differential Programmable-Gain Amplifier
你能告诉我更多关于输入的信息吗(预期的电压和频率是多少)?选择了什么增益?
输入信号可能在设备的边界图之外: