What are the different types of power dissipation?
The total power dissipation in a CMOS circuit can be expressed as the sum of three main components:
- Static power dissipation (due to leakage current when the circuit is idle)
- Dynamic power dissipation (when the circuit is switching)
- Short-circuit power dissipation during switching of transistors.
Which is the power dissipation of MOSFET?
Power dissipation is the maximum power that the MOSFET can dissipate continuously under the specified thermal conditions. It is defined between channel (ch) – case (c) or ch – ambient air (a) when mounting an infinite heat sink.
How is the power of a transistor dissipated?
Where V dd = the supply voltage, V th = the threshold voltage, W = the transistor width and L = the transistor length. Of the following leakage components, sub-threshold leakage is dominant. While dynamic power is dissipated only when switching, leakage power due to leakage current is continuous.
How is total power and dynamic power related?
Power reduction strategies can be used to minimize both types of power. Total power is a function of switching activity, capacitance, voltage, and the transistor structure itself. Dynamic power is the sum of two factors: switching power plus short-circuit power.
How does a semiconductor reduce its dynamic power?
Where I sc = the short-circuit current during switching, V dd = the supply voltage and f = switching frequency. Dynamic power can be lowered by reducing switching activity and clock frequency, which affects performance; and also by reducing capacitance and supply voltage.
Which is the larger consumer of power switching or leakage?
In geometries smaller than 90nm, leakage power has become the dominant consumer of power whereas for larger geometries, switching is the larger contributor. Power reduction strategies can be used to minimize both types of power.