Hamid.Kiumarsi
Full Member level 2
Hi,
Say I have a simple CPW line and I want to see its group delay up to 40 GHz. I use Keysight's Momentum for my simulations.
My understating is that group delay will be almost flat and eventually will increase past a certain high frequency (say 30 GHz).
But to my surprise, I get an increased group delay at lower end of my simulation bandwidth. it doesn't matter whether I set the lower simulation frequency to 1GHz or 100MHz.
I get nonsense results when I try to go to very low frequencies (compared to the higher end of 40 GHz) like 1MHz or 10 KHz.
Since I don't see any reason for the increased group delay at lower end, I suspect that this might be a shortcoming of the simulator or my setup.
Is it safe to assume that group delay in CPW (which has a good group delay flatness) shouldn't increase at lower end of the desired bandwidth?
Please advise
Say I have a simple CPW line and I want to see its group delay up to 40 GHz. I use Keysight's Momentum for my simulations.
My understating is that group delay will be almost flat and eventually will increase past a certain high frequency (say 30 GHz).
But to my surprise, I get an increased group delay at lower end of my simulation bandwidth. it doesn't matter whether I set the lower simulation frequency to 1GHz or 100MHz.
I get nonsense results when I try to go to very low frequencies (compared to the higher end of 40 GHz) like 1MHz or 10 KHz.
Since I don't see any reason for the increased group delay at lower end, I suspect that this might be a shortcoming of the simulator or my setup.
Is it safe to assume that group delay in CPW (which has a good group delay flatness) shouldn't increase at lower end of the desired bandwidth?
Please advise