Before revision: Broadly classifying, power dissipation in CMOS circuits occurs because of two components, static and dynamic: Static dissipation Both NMOS and PMOS transistors have a gate–source threshold voltage (Vth), below which the current (called sub threshold current) through the device drops exponentially.
After revision: Broadly classifying, power dissipation in CMOS circuits occurs because of two components, static and dynamic: Static dissipation Both NMOS and PMOS transistors have a gate–source threshold voltage (Vth), below which the current (called sub threshold current) through the device will drop exponentially.