Different results of SP and PSS analysis when simulating LNA in Spectre

Hi All,

I have a question, i'm currently using spectre to run simulation on my lna. I ran using sp and pss analysis.
The results from sp S21 and pss voltage gain are quite different. Note i have set them both to db20.
Does anyone face this issue?

Thanks

Regards

in PSS, the beat frequency should be accuracy and also need a large harmonic sideband number. When you display the result make sure you look at the right harmonic for the fundament frequency. You can reference the manual : Spectre RF user guide , there is a detail simulation case for LNA.

Hope it helps