Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
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page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: LNA ( S parameters ) Posted: Tue Jul 26, 2005
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
you can mail me at :-
Post subject: Posted:
Tue Jul 26, 2005 6:25 am
Joined: Mon Jun
27, 2005 2:02 pm
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.
- IRPosted 11/12/2012