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Post subject: LNA Help!!!
Unread postPosted: Thu Jul
14, 2005 10:27 am
Joined: Mon 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
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):
http://www.odyseus.nildram.co.uk/RFMicr ... torial.pdf
Should you need additional help, please let me know.
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?
is possible to show a circiut in the topic reply without to have a web
Thank you again