Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: load pull with ADS Posted: Wed May 02, 2007 9:50 am
Joined: Tue May 02, 2006 4:59 am
I have some problems regarding load pull
simulation using ADS design guide.
I am using LDMOS with spice model .
Unfortunately i received error
message (converges problem) for large input signal.
For small signal it runs OK.
Maybe the S11_rho and
S11_center is not defined well ?
I am not sure I understand how to defined the sweep value for S11
Post subject: Posted: Fri Jul 06, 2007 5:28 am
Joined: Tue Mar 15, 2005 11:43 pm
problem commonly happens during large-signal simulation. What most likely to happen is the large-signal model
parameters have limitations on high-power sweep, e.g such as breakdown voltage and so on.
The fast way to
check is, you may lower the output power sweep, step by step, let's say by 1dBm and see whether the simulations
sweep ok. Or, you may want to try to reduce the sweep power step to smaller steps.
I believe it's nothing
wrong with your simulations, the problem lies in the model. So probably you may want to try to modify the model
I hope it helps.