difference between MIM capacitors and other capacitors?

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dipak.rf

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mim capacitors

Can anybody explain the difference between MIM capacitors and other capacitors
like well cap or poly cap?

Thanks in advance
 

mim capacitor

MIM capacitors basically a parasitic capacitor between the metal layers(MIM -->Metal insulator Metal).Generally CTM mask layer is used for insulation. U will get an accurate capacitance value in this but it takes lot of area.Apart from this we have mos capacitors which is formed between POLY layer and Nwell layer(Poly Nwell Cap) gives more capacitance in less area but the variation is more.
In some process supports PIP capacitor also which is formed between POLY1 and POLY2.
 
metal insulator metal capacitor

Added after 27 seconds:


Hi rajarg,

Thanks, ya i read that MIM capacitor will have high density and lowest parasitics but disadvantage is it will take more layout area.

can u tell me why MIM capacitor will take more area for same capacitance as compare with others?
 
pip capacitor

dipak.rf said:
can u tell me why MIM capacitor will take more area for same capacitance as compare with others?
Click to expand...
Mainly because the "I" layer between the 2 metal (or poly) layers is thicker than the gate oxide used for the accumulation caps.
 
nwell cap

"I" in MIM is always field oxide. But in MOS cap it's gate oxide. The thickness is thinner. C=C0*W*L, C0=Eox/tox.
 
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