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Thank you, [USER=689410]@sidun.av[/USER] 

Your answer is really helpful to me

I tried to simulate my circuit with PSS, PAC and then I have a result as below, Could you help me explain for me the meaning of that result?

This is my result at input harmonic -2:

[ATTACH=full]194160[/ATTACH][ATTACH=full]194159[/ATTACH]

with the input signal is 1.7k and switching frequency is 2MHz

and with setup of PSS , PAC as picture below:

[ATTACH=full]194161[/ATTACH][ATTACH=full]194162[/ATTACH]

Thank you