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getting incorrect s-parameters (S21 & S12) for LNA design (Read 733 times)
Sagar Juneja
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getting incorrect s-parameters (S21 & S12) for LNA design
Jan 17th, 2018, 9:29pm
 
I am designing LNA for GPS (1.57Ghz), i am getting reasonable S11 and S22 = -10dB and -14dB respectively but my S21 is always coming as equal to S12 (i.e. S12 = S21 = -3dB).
Attached is my circuit.

Can somebody advise what could possibly be wrong.

I am designing using Cadence Virtuoso 180nm tool
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circuit_005.png
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anonymus
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Re: getting incorrect s-parameters (S21 & S12) for LNA design
Reply #1 - Jan 17th, 2018, 10:31pm
 
I attached a pdf here which might help you, because the deign is looking similar check it once.
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