CMOS Capacitances
SPICE MODEL PMOS ___ _________
__/\ ______| | Source | |
CGS | \/ RS |___| | ___ |
_____________|__________ | | | |
_|_ _|_ _|_ _|_ | |___| |
Gate ___ / _ \ I_ds \ / ___ CBS | |
___ | \/ \/ | _V_ | |___ ___|
| |__| /\_/\ V |_____| ___ _________| |_________
|___| |___ \___/ ___| |____| | Bulk | | | |
| | | | _|_ _|_ |___| | ___ | | ___ |
_|_ |__/|\__||_| ^ ___ | | | | | | | |
___ | || /_\ | CBD | |___| | | |___| |LENGTH
|_______|__________|_____| | | | CONTACT |
CGD CGB | ___ |_________| |_________|
|__/\ ______| | Drain WIDTH |___|
\/ RD |___| GATE_WIDTH
(G)
(D) ___|__ (S) (B) (Sub)
_|_ |______| _|_ _|_ _|_
______|___|_|______|_|___|______|___|________|___|__ _
| | P+ | <++++| P+ | | N+ | | | P+ | Xj
| \_____/ \_____/ \_____/ | \_____/ _
| NWELL |
_ | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _| _ _ _
\/ nbl2 \/PBL
/\ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _/\ _ _
CapJunction = BottomCapacitance*Width*Depth + SideCapacitance*2*(Width+Depth);
CapOxide = (e_r*e0*Width*Length)/Thickness;
CapOverlap = OverlapCapacitance*Width;