ywguo
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I am sorry that the first picture is a simplified schematic that does not include all important details. Please have a look at the following schematics. At that time, I thought the 75 Ω resistor branch, which is a open-loop output, was not in the loop. In fact, it has around 18 dB gain for the blue loop if there is 0.1 ~ 0.2 Ω resistance in series to the ideal ground. I mean node 0 or gnd for the simulator when I say ideal ground. So I move iprobe to the opamp output as shown in the following picture. Now it is done.
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