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Post subject: Ansoft Designer Posted: Thu Dec 22, 2005 9:07 am
Joined: Fri Aug 05, 2005 2:56 am
I'm a newbie in RF and I'm just starting to lear using ADS and Ansoft Designer. I do my labworks in ADS and at home I use Ansoft Designer. Now,
I need to simulate a 50ohm microstrip tx line matched to both source and load. How do I proceed?? Help!!
Post subject: Posted: Thu Dec 22, 2005 9:54 am
There are standard library components for a 50 ohm transmission line as well as for a source and load. It is as simple as placing them in your circuit. You can also put down models for microstrip, stripline, etc, and adjust trace width, length, metal thickness, dielectric constant, etc. If you use that approach, the line will only be exactly 50 + j0 ohms for one frequency (and its harmonics).
If you are looking for a program to calculate the transmission line parameters, then try TXLine, from AWR (free).
Post subject: Posted: Thu Dec 22, 2005 10:11 am
The hardest part about ADS and Designer is actually simulating the circuit. Finding and connecting the parts is not a problem, but then you have to set up your analysis, which can be tricky if you have never used the software before. I have more experience using ADS and I believe the best way to learn how to set up your analysis is to do the tutorial. Check out their help file.
A quick simulation in ADS:
An S-parameter simulation is the most straightforward. To do a two-port solution, simple grab two of the terminal boxes (under Simulation->S_Param). Then grab the S P part and put it in your schematic. This tells the solver what frequencies to sweep for your solution and what parameters to calculate (S parameters by default). Now add your circuit parts (from the component pull down menu) and connect them to the terminals. Don't forget to ground your terminals if you're using single-ended ports.
Now go to Simulate->Simulate (or click the Gear button) and the simulation will run or give you an error if the setup is wrong. Once done, it will pop up a Data Display window. From here you can drag and drop graphs, tables, smith charts, etc... and see your results. ADS Data Display is a whole other beast, but the basics of it are pretty straightforward (more so than ADS Schematic).
Again, I'd suggest going through some of the ADS examples in the help file. Hopefully I didn't just confuse you