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
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
Unfortunately i received error message (converges problem)
for large input signal.
For small signal it runs OK.
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
The converge 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.
it's nothing wrong with your simulations, the problem lies in the model.
So probably you may want to try to modify the model large-signal parameters.
I hope it helps.