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The reactance of the capacitor when voltages at both the ends are the same

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sajjade

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Reactance of the capacitor when votlages at both the ends are same.

In my circuit a condition is arising where DC voltages at both the ends of a series capacitor is same (say 3.3v). I want to know, under this condition does capacitor offer zero reactance? any reference for derivation of reactance under this condtion.

thanks
 

Re: Reactance of the capacitor when votlages at both the ends are same.

When both ends voltages are same , then no current thro the cap.
But the reactance will be same conforming the basic equation.
 

Re: Reactance of the capacitor when votlages at both the ends are same.

Details such as whether this is a MOSCAP or a MIM / POP
type matter. I'll presume that since this is the analog IC
section, that it's about an integrated capacitor.

A MOS capacitor will have different C and "access resistance"
and parasitic capacitances (shunt, w/ their own access RL)
depending on where it sits voltage-wise relative to its well or
substrate. Things like body effect will push on the Vgs=0
channel resistance and the degree of accumulation / depletion /
inversion. Species matters too (depletion mode meant for the
application, or an opportunistic "native" FET? They can act
pretty different, depending.
 

Re: Reactance of the capacitor when votlages at both the ends are same.

Hi,

arising where DC voltages at both t
Click to expand...
Only AC voltages may cause a current.

You may have 100V of DC across a capacitor without current flow.

Klaus
 

Re: Reactance of the capacitor when votlages at both the ends are same.

You can derive voltage dependent output capacitance in simulation. Generally, Cds is highest for Vds = 0.
 
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