Electronics > Projects, Designs, and Technical Stuff

LNA circuit

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promach:
What I do not understand is the strange AC response in the previous post just above with a sharp magnitude dip and abrupt 180 degrees phase shift at 2.9GHz


The transient response looks normal though.

duak:

--- Quote from: promach on August 05, 2019, 08:24:41 am ---What I do not understand is the strange AC response in the previous post just above with a sharp magnitude dip and abrupt 180 degrees phase shift at 2.9GHz


--- End quote ---

L1 & C1 form a parallel resonant circuit with a resonant frequency of 2.9 GHz.  At resonance, it will have a high impedance and attenuate the signal applied to M1's gate.  Below resonance, C1 is dominant and advances the phase, while above resonance L1 is dominant and retards the phase.

promach:
I have compiled everything into https://github.com/promach/LNA

Feel free to point out any issues with the circuit.

SiliconWizard:
Even Lbias/Cin will influence the overall frequency response, won't they?

promach:
Anything wrong with Lbias = 3nH  and Cin = 1pF   ?

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