vivkr wrote on Oct 10th, 2007, 3:03am:I was wondering how Spectre (or another simulator) simulates transmission lines and such distributed circuits.
Generally, simulators work by solving network equations (KCL/KVL) on every point of a lumped circuit. In
distributed circuits, one cannot apply KCL/KVL as these do not hold, and it is also not possible to represent the
circuit in a lumped format.
How does it work then? Could someone enlighten me please?
Thanks
Vivek
Hi Vivek:
If you go to the “EDA Tools” and select Tools>> RF, you might see some options showing the possibility of Transmission line modeling by Cadence. But in fact these are not going to simulate what you are really searching for.
You would need to model you TL in some other softwares like HFSS, ADS to simulate the TL. Take the simulated file from these softwares back to Cadence and put it into a “Black Box”. Now you are able to simulate you circuit with TL.
The other way is to draw the schematic of you TL model, and substitute all the parasitic parameters and then run the simulation.
Cheers
Ali