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Transistor for design LNA 9 GHz

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arisesa

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I need help,

I want to design 9,4 GHz LNA
What's suitable CMOS transistor for my project?
I need S parameter file too, for my simulation.

Any suggest?
 

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    arisesa

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I found that transistor only give me gain about 10 dB (my specitication : gain 20-30 dB, NF<2 ) in my frequency. I desire about 20-30 dB.
1. can I reach only one stage design?
2. are there types of transistor (only one stage) can give me that gain.
3. I use LINC software from ACS, what do y think?
 

No, you can't reach this kind of gain with only one stage at this frequency. Have to use at least 2 stages.
 

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    arisesa

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If NF is the main concern, forget about bipolar transistors at that frequency.Instead, you should select SiGe HBT or MesFET transistors for your target.
20-30 dB can nor be procured with single stage, at least 3 stages should be designed very carefully because if interstage matchings are not well designed and implemented, you will loose gain and as a consequence, NF..
It's a tough ask with discretes...
 

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    arisesa

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Thank all,

But, now I have new problem (new question).

I have simulated my design. I got magnitude & phase of S11, S12, S21, S22, K, delta, SWR. But I didn't get NF. (from my simulation K>1 & delta<1 it's stable, right?)

How to calculate NF from those values? (mathematically)

regrad
 

Hi

U need to have Noise parameters for the transistor to calaculate noise figure..

By the way which software are u using??
 

    A

    arisesa

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of course I have (for each transistor)

Can I use this formula to get NF?

NF = NF1 + (NF2-1)/G1

by the way, I use LINC from ACS.
 

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