Transmission Line modeling: Micro-Cap v12:So now when I set model type to lossy I see different simulation results:
Parameters: R=96.7ohms/in C=1.09pF/in L=21.217nH/in Len=29.5mm/25.4(mm/in) = 1.16 in.
It appears that model type ideal does not include parameter Len. However since my length of 29.5mm is close to an inch (1.16 inch) I was getting results that seemed reasonable. However the addition of loss or line resistance I have a dampening and attenuation affect.
Again I have stepped R1 (termination resistor) from 50 ohms to 300 ohms.
Zo = 139 ohms Td = 152 ps/in * 1.16 in = 176.32ps
And .... lossy model w/ no termination:
I have just added a line indicating the timing at 1.5v * 90% = 1.35v. Since it is unclear to me where a clock edge would be located this is just for reference. More on this when I consider timing. For now I think I will remove termination resistors.