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OPA1612仿真失真高达3.8%的异常问题???

Other Parts Discussed in Thread: OPA1612

官网下载OPA1612的参考设计,是个反向放大器,在修改输入电压为2v,默认1Khz,修改负载电容2p,增加负载电阻,其他什么都没改,谐波失真竟然高达3.8%???

改为正向放大,失真看起来就正常了,这是个什么情况??是模型有问题还是我哪里没做对??如果我需要反向放大器怎么办??