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OPA657: TIA电路仿真相关问题

Part Number: OPA657
Other Parts Discussed in Thread: OPA847

如图所示,图一图二都家里2.5V偏移。但是图一的交流输出VM1只有20mV VPP,但是图二加上后级放大后,VM1交流电压有1V VPP,请问这是为什么。电流源参数两幅图一致如图一所示。