LNA Help!!! - RF Cafe Forums
Post subject: LNA Help!!!
Unread postPosted: Thu
Jul 14, 2005 10:27 am
May 30, 2005 9:16 am
I'm a gilr who isn't able to
design a LNA for ZigBee application at University.The constraints
are: Vcc = 1.8V, frequency = 915MHz NF lower as possible,power consumption
as well . Could you give me the formulas and one simple (single
ended input, differential output) circiut. Please could you give
me any suggestions ? I really need it.
Unread postPosted: Thu Jul 14, 2005 10:49 am
Joined: Mon Jun
27, 2005 2:02 pm
First of all, you will need to select a transistor matching
for your frequency band and gain.
There are plenty of formulas
to use when you design an LNA: Stability, Gain, Return Loss, Noise
Figure etc. Nowadays, Engineers mostly use CAE (Computer Aided Engineering)
tools for designing LNA, Filter and other RF circuits. All of these
formulas are entered into the design tool and by that save the designer
lot of time and calculations.
Attached is a link to a PDF
that will certainly give you a good staring point to design your
LNA (It includes a discussion about the design and formulas involved
in LNA design):
Should you need additional help, please let me
Good luck!! :wink:
Unread postPosted: Thu Jul 14, 2005 11:41 am
Firstly, I have to thank you, I'm reading
your link and I think it will be useful.
Secondly, I have
to use a CMOS or TSMC 0.18um tecnology, input matching 50 ohm. Do
you have any documents about CMOS LNA?
Finally, it is possible
to show a circiut in the topic reply without to have a web space?
Thank you again