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...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
Ansoft Designer, Microwave office, or ALPAC - 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: Ansoft Designer, Microwave office, or ALPAC
Posted: Wed Oct 19, 2005 4:24 pm
I want to get the s parameter of
If I have the spice model of the transistor, am I
able to get the S parameter of the transistor using any of these softwares?
Post subject: S-parameters from SPICE
modelPosted: Wed Oct 19, 2005 10:35 pm
Actually, all you need is
SPICE. Set up the appropriate measurement circuit, simulate, and you've
Posted: Thu Oct 20, 2005 7:10 am
Oct 06, 2005 6:34 am
A very good example available in
the installation folder of microwave Office....
Features\NEW--Models--NEW\New Nonlinear Models.emp
Post subject: Re: S-parameters from SPICE modelPosted: Fri Oct 21,
2005 3:06 pm
Actually, all you need is SPICE. Set
up the appropriate measurement circuit, simulate, and you've got it.
But I won't get s-parameters out of pspice,
Post subject: SPICEPosted: Fri Oct 21,
2005 8:27 pm
S-parameters are essentially nothing but reflection
coefficients: ratios of voltages and currents. You can get these out
of SPICE, you do have to do some work to set up the necessary measurement
Hmm - this may be an area worth writing an article
Posted: Sat Oct 22, 2005 12:43 am
Thu Oct 06, 2005 6:34 am
Try this in Microwave Office,
1. Build the schematic using spice model & setup
input & output biasing options...
2. Simulate the circuit
3. export the s-parameters from output files section...
you have problems send me the spice model with biasing values..I will
send you s-parameters..
Post subject: Posted:
Sun Oct 23, 2005 6:48 am
Joined: Fri Sep
02, 2005 7:25 pm
Location: Hampshire UK
is right in that in principle once you have a SPICE model, you can contrive
the s-parameters, provided the SPICE model is good enough. That is,
you end up with something that agrees with measured s-parameters. Working
from s-parameter end has huge value in designing matching arrangements
for best noise or IIP3, at the same time keeping an eye on stability.
Then you can get back to the non-linear simulations / bias / and layout
This is OK, but having a "one-click" approach to "export"
implies having a tool like Microwave Office. This cannot can be taken
for granted. Its a bit of a journey to set up a series of simulated
s-parameter measurements using contrived SPICE circuits, and then take
the leap of faith that they agree with a measured device.
they really? So what of the data .s2p files we get? Are they churned
out by a manufacturer who had a SPICE model, and then made a simulator
do "export"? I think they measure s-parameters first!
networks it might be OK, but I would be cautious of s-parameters derived
in this way for any semiconductor device, coupler, magnetic core device,