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guest Post subject: Ansoft Designer, Microwave office, or ALPAC
Posted: Wed Oct 19, 2005 4:24 pm I want to get the s parameter of
the transistor. 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?
Top Guest 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
got it. Good Luck! Top manju Post subject:
Posted: Thu Oct 20, 2005 7:10 am Lieutenant Joined: Thu
Oct 06, 2005 6:34 am Posts: 3 A very good example available in
the installation folder of microwave Office.... C:\Program Files\AWR\AWR2004\Examples\Circuit
Features\NEW--Models--NEW\New Nonlinear Models.emp ---manju---
_________________ regards, manju Top guest
Post subject: Re: S-parameters from SPICE modelPosted: Fri Oct 21,
2005 3:06 pm Guest wrote: Actually, all you need is SPICE. Set
up the appropriate measurement circuit, simulate, and you've got it.
Good Luck! But I won't get s-parameters out of pspice,
Top Guest 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
scaffolding. Hmm - this may be an area worth writing an article
about... Good Luck! Top manju Post subject:
Posted: Sat Oct 22, 2005 12:43 am Lieutenant Joined:
Thu Oct 06, 2005 6:34 am Posts: 3 Try this in Microwave Office,
very simple 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... If
you have problems send me the spice model with biasing values..I will
send you s-parameters.. manjunatha_hv@rediffmail.com _________________
regards, manju Top Graham Post subject: Posted:
Sun Oct 23, 2005 6:48 am Colonel Joined: Fri Sep
02, 2005 7:25 pm Posts: 34 Location: Hampshire UK The guest
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
effects. 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. Do
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! For passive
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,
etc. Posted 11/12/2012
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