bio_man
Full Member level 2
Hello
I'm simulating nMOS Cap to get estimate of the capacitance value. I used the old technique ( @ 1time constant, Vc=63.2%of Vin) then I found the capacitance ( C=time/R)
the circuit is attached, I used LTspice.
I want to get the CV curve for this nMOS cap as it is more practical, so can any one help me how to get this curve in the simulation?
second point, what is the difference between nMOS cap and pMOS cap because when I simulate the pMOS cap, I got no response?!
thirdly, is it better to use poly-poly cap instead of MOS cap? because it seems MOS Cap is non-linear ( it is changing based on the Vgs voltage)?
I'm simulating nMOS Cap to get estimate of the capacitance value. I used the old technique ( @ 1time constant, Vc=63.2%of Vin) then I found the capacitance ( C=time/R)
the circuit is attached, I used LTspice.
I want to get the CV curve for this nMOS cap as it is more practical, so can any one help me how to get this curve in the simulation?
second point, what is the difference between nMOS cap and pMOS cap because when I simulate the pMOS cap, I got no response?!
thirdly, is it better to use poly-poly cap instead of MOS cap? because it seems MOS Cap is non-linear ( it is changing based on the Vgs voltage)?