Hi Shawn, Thank you for your answer. I am running the PSS simulation by sweeping the amplitude of the input signal (Vac) to plot THD vs Vac (dBm) for the device under test. The frequency is frf=1KHz and the input Vac is swept through the input port. You can find the settings for PSS and PAC analysis as well as the input port for the simulations below. I can use two resistors of 100 ohm or only one 50 ohm resistor in the first circuit. However, my main problem is to know if these testbenches are basically correct to simulate THD and IIP3 or do I have to change them? Are the simulation results obtained from these circuits reliable? Thank you for your support. Hossein
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