Farads

A capacitor resists a change in voltage, proportional to current, and inversely proportional to capacitance. The equation of a capacitor is dv/dt = i/c.

Capacitance in mosfet is of three types:

gate capacitance

diffusion capacitance

routing capacitance

Gate capacitance: limits the speed of the device t which it can be operated

Diffusion capacitance: It is the capacitance due to charge carriers between drain and source.

Routing capacitance: It is the capacitance of the metal which is deposited on the top of oxide layer.

1. Transition capacitance

2. Diffusion capacitance

3. Space charge capacitance

4. Drift capacitance

stray capacitance calculation