Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
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My Hobby Website:
load pull with ADS - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
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.