Hello,
I have some problem when doing the PSS/PAC/PSP simulation with Nport from the analoglib.
I'm using Spectre Version 19.1.0.373.isr7 64bit and Virtuoso IC6.1.8-64b.
I wrote a S4P touchstone file to model an ideal IQ coupler and simulated it with Nport component from analoglib.
I tried PSS/PSP/PAC simulations with both shooting and HB engine.
The result of HB engine is correct, funtioning exactly as an ideal IQ coupler. While the result of shooting engine is completely wrong.
I used the PSS shooting engine for NPORT simulation with Spectre 14 and Virtuoso IC6.1.6 before. It works very well.
I wonder whether there is a way to get NPORT works with PSS shooting engine in the new Spectre/Virtuoso version.
For the Nport setup, I tried nearly all the options for passivity, causilty, interpolation methods.
One weird thing is that no matter which interpolation methods I chose (linear, rational), the final fitting is always based on BBspice.
Any comment is appreciated. Thank you.
Best regards,
Yang