cadence blowup parameter
Thanks for your reply.
1- I tried fitting a Pi-Lumped Network Model (which would physically be able to describe the behavior of my block across a narrow frequency range) in a narrow frequency range using ADS Spice Model Generator, but the generated/predicted S-parameters of this lumped model are very different from the original S-parameters, and as a result, the simulation result of the circuit is not right.
2- I simulated the same circuit using S-parameters (SNP compoenets) in ADS, and got consistent result for transient simulation there. So, basically, there should not be any problem in time-domain simulation using S-parameters. I am not probably using the right settings in Cadence.