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Hi all.
i want to extract Cgs, Cgd in CS amp by ADE simulation.
The test bench and results table was attached.
To verify simulation results i was simulation another method.
By using AC simulation, i can extract capacitance of Gate.
The result of AC simulation total gate cap is 93.76fF and...
Hi~ guys.
Recently i designed 1GHz PLL.
But the PLL is have a big isuue. The designed PLL is generated EMI.
Now i have a questions.
What is the main soure of EMI?
EMI is related with noise floor or noise figure?
One of my friend said, by the EMI factor raise up noise level of the spectrum...
hi~ rismriti.
i think you want to calculate noise figure by using input referred noise voltage. noise figure(NF) is calculated this equation.
NF=10log(1+(V^2/kTR))
(V=input referred noise voltage, k=boltzmann's constant, T=temperature in Kavin, R=50Ω)
Hi nalog_prodigy
My final destination is 40MHz band pass filter. To make a 40MHz band pass filter, first of all I design an 5GHz op amp. I know that bandwidth releated input Tr gm and gm is related with current consumption.
Then, how do you design 5GHz amp maximum current 0.5mA. I think it is...
Hi, all~
I'm designing op amp for active RC band pass filter at 40MHz.
I get a specification of op amp to do a filter modeling. The specification of op amp is like that :
- unity gain freq. is more than 5GHz when load cap is 0.5pF
- dc gain is needed 60dB
- maximum power dissipation is...
Hi.. all~
I don't understand the meaning of feedback factor in physically.
Someone saids feedback factor is ratio of closed loop impedance and total loop impedance(closed loop impedance/total loop impedance).
Why this fomular is induced?
Hi,, all~
I have a basic question. How do you desice dc operating point?
I have been decided operating point small overdrive voltage. Is it OK? And Vds is decied Vds=vdsat+0.1(or 0.2)V.
Please tell me your method to decide dc operating point. Thanks~
To abcyin
I don't understand your expain. Please explain detail. And what's the difference your method and using "iprobe" method at the spectre simulation. Is the same method?
question of CMFB
dear ljy4468
I measured phase margin at A0B=dB place.
I have another question. If loop gain is much large, closed loop gain is changed?
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