Electronics > Projects, Designs, and Technical Stuff
LNA circuit
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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