Your equation is wrong.If I try to extract voltage gain from PG:
Ri=50ohm, Ro=1.3Kohm(the calculated impedance of the LC tank at fc)
Yes.dB(S(2,1)) in ADS gives 20log(S(2,1))!
No.S-parameters are voltage ratios
This discussion has been completely concluded like following.Sweetheart, I knew you would start that discussion again, again
I've read these topics and many other things on the issue but got more confused and because of time constraints, I can't really go deep into it! So let me say what exactly I want to do and know:
It is true for actual measurement using actual Vector Network Analyzer.S21 is the gain with 50 ohm source and load impedance
I think so.You don't need to take the detour over S parameter.
Yes I'm designing the LNA and other blocks myself, that's what I should do. now I realized that I only need S-parameters for S11 of LNA. The confusion was because S21 is expressed as gain in everywhere, then when I simulated in AC analyze gain was something else! So I got stuck between microwave stuff and RF-electronics. And the 1.3Kohm impedance at the output for S21, came from the idea that the output should be high in order to get gain(Lack of microwave information)!However, as you are apparently designing the circuit yourself rather than applying an of-the-shelf LNA, why don't you simply determine the gain with actual load impedance in the simulation. You don't need to take the detour over S parameter.
This was the straight forward answer. I calculated the voltage gain from this derivation, campared to the AC analyze, both equal with every Rload.VGain=V2/V1
Pa=E^2/(4*Rsource), Pload=V2^2/Rload
V1=V2/VGain=Rin/(Rsource+Rin)*E
V2/E=Rin/(Rsource+Rin)*VGain
S21=sqrt(Pload/Pa)=2*sqrt(Rsource/Rload)*(V2/E)=2*sqrt(Rsource/Rload)*Rin/(Rsource+Rin)*VGain
No. S-parameter Analysis is not needed at all.now I realized that I only need S-parameters for S11 of LNA.
No. S-parameter Analysis is not needed at all.
You can evaluate all characteristics by AC-Analysis.
Don’t use S-parameter analysis.
Why do you approve Agilent but not Cadence? What is the technical problem of Cadence EDAs?
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