I want to do differential TDR simulation in cadence virtuoso. I have a differential channel, made of Tlines and interconnects (passive componenets). How to setup the TDR simulation to get impedance over time? I know, I have to terminate both n and p channel with 50 ohm each at the output. I have to do also in the input. But how to connect the step voltage source at the input and get the recuired impedance over time from the channel reflection? Should I connect 2 step voltage source at the input of n and p channel ( one is +1v and another is +1v)? Then how to calculate the impedance at the input from the reflection? Can anyone help me.
Note: I am using virtusos version IC6.1.7-64b.500.4, there is no rflib. So I cannot use Balun ports.