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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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  #1  
Old 02-02-2007, 08:02 AM
dyrain dyrain is offline
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Red face RF DESIGN using ORCad PSpice

FOREMOSTLY, does orcad even support RF designs ( say frequencies up to 10GHz)?

currently, i am designing a low noise amplifier using all the trial software versions that are available online. The orcad pspice is one alternative, but i'm a bit weary on the simulation results that i am getting.

another thing, for a cmos rf LNA design, it would be best for me to implement a 4-terminal mosfet device into my design..however, i cant find a 4-terminal nmos (or pmos) model in the orcad library. all of the available models are 3-terminal model devices ( NMOS device with a source-body tied configuration ). What can i do?

HELP!!!!

Thanks in advance!
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Old 02-02-2007, 08:37 AM
n9352527 n9352527 is offline
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It can simulate the circuit, however the result is most probably not going to be of much use. There are just too many parameters affecting RF design at that frequency to model accurately with SPICE.

You can do your own MOSFET models, with four terminals, or there are many model cards available out there on the internet. Just make sure the parameters are suitable for such a high frequency of operation.
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Old 02-03-2007, 12:45 PM
dyrain dyrain is offline
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Red face suggestions on finding MOSFET LEVEL3 SPICE model card?

Hi again. Thanks for the reply!

I'll give another shot on trying to work my design on orcad.

I tried to find the mosfet model cards for RF, but to no avail!

Would you have any suggestions on where to find them? particularly, a 0.5um mosfet level3 spice model card.

Thanks in advance!
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Old 02-03-2007, 01:01 PM
voduychau voduychau is offline
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i think Pspice is not good for simulation.It's hard to learn

some part give a wrong result,and some,i can't understand how to simulate it!

i recommend you to try Multisim
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  #5  
Old 02-03-2007, 09:55 PM
n9352527 n9352527 is offline
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Quote:
Originally Posted by dyrain View Post
Hi again. Thanks for the reply!
Would you have any suggestions on where to find them? particularly, a 0.5um mosfet level3 spice model card.

Thanks in advance!

Unfortunately no. I have plenty of cards at different feature sizes, but none of them are binned for RF at 10GHz. And I doubt it if you could find one that is meaningful enough.
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