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Help!Help!Help! For LNA design

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XUNGHA

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I have designed LNA, that contains three stages and bandpass filter. First stage is used ATF-36077 PHEMT GaAsFET. Following second stage with Minicircuits ERA-3 MMIC. Microtrip bandpass filter take out amplified outband signals and thrid stage, again with ERA-3, amplify final signal.
For PCB, I have used ROGERS 5880 material (Er=2.2; thickness = 1.575mm ).
My amplifier desire parameter as following:
Frenqency range: (2.65 -:- 3.15)GHz
Gain: (30 -:- 32)dB
Noise figure: <2dB
Supply voltage: +5V; -5V
Connectors type: N

I have calculated for LNA by hand. Therefore, my LNA is without accuracy and mis-matching. I achieved is about 10dB (too low).
Anybody has software to design LNA. Please! You design and calculate LNA in softwave. I wonder if you can to give me your LNA layout, so I make reference to it.
Thank you for your help!!!!!
I am looking forward your reply. :D
 

brmadhukar

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Hi,
I have doen an LNA for 1.5GHz so may not be useful for you. But check out the agiltent website for APpcad and also a matching game simulator. These shall defintely help you.
BRM
 

wirelesscomm

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I am a freshman in rf design!
but i have design a lna in 4ghz with atf36077, and the tool is serenade.
the nf is 0.8,
but it still had some problems:(
 

goxy

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Are you sure in microstrip filter characteristic? Remove this filter and check gain again.
 

T Zul

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Anybody has done it using CMOS process using SpectreRf... please let me know

T Zul
 

activewei

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I suggest you to check with RF probe at different interval. As you have cascaded them, you need to find out which component cause problem before you make any changes...
 

djxwolf

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for cascaded amplifiers, the inter-stage match networks must be designed cafully, otherwise, the performance will degrade.
 

djalli

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What are:
Noise Figure + Gain + Output IP3 for each part of your LNA?

What are also for the system:
Temperature + Input Power + Noise Bandwidth + S/N sensitivity?

If calculation for output is not what you expected then must do some magic like matching if possible or you must choose something else.
 

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