Hi,

I am trying to simulate the input matching S11 of a passive mixer in SpectreRF using a PSS+PSP simulation. My passive mixer is made of ideal switch ( analogLib:switch).

In simulations I observe that the S11 is dependent on the value input power delivered by the input port!  I set the port parameter

Case 1: Amplitude  1(Vpk) = 1
Case 2: Amplitude  1(Vpk) = 7m

In both the cases the frequency response of the S11 looks quite different.

Please note, the mixer is made of ideal component only, so it is not as if changing the Amplitude of the input power is resulting is any of the switches becoming non-linear or some phenomenon of that nature.

If someone has any comments on this, that would be great!

Thanks,
unevB