Hello Support team,
case study:
1.S-parameter ( S17P, touchstone, 17 ports) for a passive package is extracted using EM simulation ( EMPro)
2.testbench is made In ADS and performed s-parameter simulation ,noise simulation. The result are matched to Empro simulation and also NF simulation is realistic.
3.use the same s-parameter set and same test bench in cadence ( IC6….), performed the same S-parameter simulation and noise simulation. S-parameter results matched to EM pro and ads- results but NF simulation results doesn’t match to ads results.( 200 mdB different in NF- result)(here I used probe and port setup in cadence)
4-If I make a testbench in ADS for 17 port and don't connect ports I don’t need with and extracted again from 17 ports( s17p-> to s2p) file a 2-port file.than I used in cadence 2-port instance for simulation ( from analoglib) and used extracted 2-port file then all results from cadence match to ADS and EM-pro.
conclusion: using 2-port and 2-port touchstone file for NF-simulation, result is matched but using nport and N-port touchstone for NF simulation result is differed.
I am wondering, which equation cadence use to perform NF simulation using S-parameter for N-port?
Best