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amit
Post subject: LNA ( S parameters ) Posted: Tue Jul 26, 2005 5:03 am
hi to all ,
can anyone help me , please ?
I want to know that how can we fabricate FET with desired S parameters ? let me clear my question ....
suppose that I design LNA with S parameters taking from datasheet and now when I make its' layout I must make FET with exactly same S parameters as I took from datasheet. Please help me ....
you can mail me at :-

amitgopal1@rediffmail.com
Thanks
--amit


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IR
Post subject: Posted: Tue Jul 26, 2005 6:25 am

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hi Amit,

You have to take the S-Parameters from the data sheet. Usually manufacturers will provide S2P file for the device. Before you make the layout, you have to make simulation, and enter the properties of the transmission lines, via holes for ground and any other physical connection into the simulation. Another important thing is to enter the proerties of the substrate you intend to use into the simulation (Its dielectric constant,
Tan delta, width etc).The simulation will give you overall S-Parameters of the design including total gain and return losses. When you fabriacate your circuit you take from this simulation the dimensions of transmion lines and via holes for grounds.

_________________
Best regards,

- IR



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