I have an urgent question about eye diagram simulation in ADS. I hope you can give me some advice!

hqhui

I have an urgent question about eye diagram simulation in ADS. I hope you can give me some advice! [Copy link]

I first built the single-line and differential line models in HFSS to get their S parameters respectively, and then used ADS to perform time domain transient simulation. The S parameters of the differential in HFSS are better than those of the single-line, but the eye diagram result is worse than that of the single-line. I don't know why? Is there anything I need to pay attention to in the simulation eye diagram settings? And how does the four-port correspond to the four-port model in ADS? I suspect there may be some problems with these settings in ADS. I hope someone can ask me, thank you very much! Can anyone ask me how to build the model circuit for eye diagram simulation in ADS?

mutoudonggua

I have never used ADS, so I can't help you. Go to this forum and ask: http://hfss.vicp.cc

yh19782000

Generally speaking, if you only import the S parameters into ADS to form a model, the simulation results will not be different from other software. You may want to take a look at the S parameters of the model in ADS to see if they are consistent with the results obtained when extracting the model. If not, check whether the port order is incorrect. If the port is correct, I wonder if you only observe the eye diagram for the single-line and differential line models, or combine them in one circuit? I personally think that the parasitic capacitance of the differential line will be higher than that of the single line, which should be reflected in the eye diagram. The rising and falling edges of the signal should be smoother than the single-line eye diagram. I don’t know if this is the case when the author refers to a bad result. The above is just a personal speculation for reference only. If you disagree, you can provide some more detailed information for everyone to discuss.

hqhui

My input signal is a 7-bit tail random code, and the eye diagram I see is scattered, while the single line is gathered together, which looks better; In addition, the port set in HFSS is differential mode. How can I match the port setting in HFSS with the four-port model in ADS? ? Thank you!

hqhui

The host, that webpage can't be opened, haha! Do I need to use a proxy? Thank you!

hqhui

In fact, the eye diagram I see is very scattered, not like a single line is better (just like a line, the most ideal is a line), so I feel that the signal eye diagram is not good, tomorrow I will go to see what the S parameters are like? But thank you very much for your advice!

xialibaren05

Hello everyone, I would like to ask how to set the differential excitation port in HFSS? I am doing CPW simulation

lovely100

I also do this, hope to communicate

fireyongA

I am also learning this software and want to use ADS to simulate eye diagrams. But I don't know how to generate them, and the book I borrowed doesn't mention this issue. Can anyone who knows tell me how to simulate them? The more specific the steps, the better^-^Thank you in advance!

chuchuda

Eye diagrams are difficult to make!