mixer selection - RF Cafe Forums
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Post subject: Ansoft Designer Posted: Thu Dec 22, 2005
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
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
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).
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