What is MIM capacitor and why do we need them?

[VLSI_Learner]

What is MIM capacitor?
Why it is needed in your layout, when the basic idea is to remove parasitic capacitor as much as possible?
When it is needed?

 

[helpmejerry]

MIM or metal insulator metal capacitor, sometimes referred as conductor-insulator-conductor, is one type of available capacitor types in a typical CMOS technology. There are many reasons to use a capacitor in your circuit (SC, pole splitting, etc ).

Hope this helps.

BR Jerry

 

[Prashanthanilm]

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.

This is needed parasitic to increase the cap.

 

[VLSI_Learner]

Can you please tell me MIM's which capacitor is attached to what in layout, when we place MIM cap in our layout?

 

[dick_freebird]

The main virtues of MIM caps are low voltage coefficient
and low / low variability series resistance. Both of these
are poor on MOS capacitors, for example a high-VT NMOS
capacitor has negligible C and near infinite ESR when Vgs=0
(channel is "off", which is your connection to the bottom
plate).

MIM tends to have lower C density (consume more area).
A depletion mode MOS cap probably beats it, there. A
composite MIM-over-MOS can be a good high density,
decent-net-Q decoupling structure if that stack is DRC-
legal (this varies, underlying topography can affect MIM
matching and reliability / breakdown).