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Ansoft Designer, Microwave Office, or ALPAC - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


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?


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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!


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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


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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,


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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!


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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


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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.



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