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请问你的问题是?
输出信号是指OPA843的输出吗? 它只有+/-5V供电,无法输出6V电压!
另外你的R4接个40欧姆的对地电阻是什么意思?当负载有点大啊!
电路可以参考手册中FIGURE 1. Gain of +5, High-Frequency Application and Characterization Circuit.,
50欧姆的输出匹配电阻应该串联在输出线上!