I am having a problem of frequency shift in ADS. I have a microstrip filter design which I simulate in Momentum. This filter's center frequency in 1580MHz in ADS 2009U1. However, the same filter's center frequency is 1615MHz in ADS 2011. I use same substrate parameters and mesh settings in both versions. Everything is same except the center frequency. Whatever structure I simulate there is always a 30-40MHz shift between two software versions. Now I don't know which one is giving the correct result. Has anyone noticed a similar problem? What could be the problem? Thank you
The bandwidth is around 50MHz. The problem occurs in every design. When I simulate the design in the other version the whole band shifts around 30-40MHz. If I scale the design I can get it back to the original band...
You can also simulate in AWR to compare with ADS.
And the mcirostrip bandwidth should be about 10%, and when you need rigid limit on bandwidth, microstrip is not a good choice.
try simulating something else .. something whose response is already known and then see which version gets close to that response.. you can have circuits with known response from internet also....!!
but as a matter of fact i guess 2011 ought to be more close to real than 2009 version.
i test one layout in ADs 2011 which i have the main project in ADS 2009
there is difference in result between version
i attached the result
the main problem to transfer to ADS 2011, ADS dosnt work in may computer because it is 64-bit , also that version with ***** i dont know with all facilities or not.
from your attach doc not just the frequency is shifted also the magnitude is decreased means more reflection. nevertheless i don't find a satisfactory reason for this behavior since you say everything else was same!!
anyways i recommend you to post the query in ADS forum of their website and ask them which version to believe !!!
Hi, I also found the simulation results are different between ads2009 and ads2011. I used the ads 2009 momentum to simulate the inductor first. Then I opened the ads2011 and used the "convert project to workspace" to translate the project from ads2009 to ads2011 which made all the settings same. But the simulation results are not same. I do not sure which one is right