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help: why my LNA gain is negative(db)?

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ssdd

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hi,
why my LNA gain is negative(db)?
 

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elbadry

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Are you checking the power gain or voltage gain?
 

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suhas_shiv

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Probably because instead of gain you are getting loss. Have you checked your biasing and matching circuits? What kind of topology are you using?

It would help if you could post your circuit.
 

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    ssdd

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ssdd

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HI,friends,
I post my circuit on.
 

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ssdd

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i think the parameters are probably not set right,but i can't find
 

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ssdd

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r2,r3,M3 form the transimpedance stage,

I post another circuit ,you can see this one ,its gain also negative

Added after 3 minutes:

hi ,friends,can you leave you email or msn?thanks

my msn: ss_dengdeng@hotmail.com
 

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ssdd

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nobody?i need your help
 

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pixel

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Can you plot your DC node voltages and currents?
 

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