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Switching Power Formula

GoSwitching Power in CMOS Formula

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Switching Power is called the dynamic power because it arises from the switching of the load. Check FAQs

P s = α \cdot (C \cdot {V bc}^{2} \cdot f)

P_s - Switching Power?α - Activity Factor?C - Capacitance?V_bc - Base Collector Voltage?f - Frequency?

Switching Power Example

With values

With units

Only example

Here is how the Switching Power equation looks like with Values.

Here is how the Switching Power equation looks like with Units.

Here is how the Switching Power equation looks like.

0.132 = 1.65 \cdot (4.9 \cdot {2.02}^{2} \cdot 4)

0.132mW = 1.65 \cdot (4.9μF \cdot {2.02V}^{2} \cdot 4Hz)

0.132 = 1.65 \cdot (4.9 \cdot {2.02}^{2} \cdot 4)

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Switching Power Solution

Follow our step by step solution on how to calculate Switching Power?

FIRST Step Consider the formula

P s = α \cdot (C \cdot {V bc}^{2} \cdot f)

Next Step Substitute values of Variables

∴

P s = 1.65 \cdot (4.9μF \cdot {2.02V}^{2} \cdot 4Hz)

Next Step Convert Units

∴

P s = 1.65 \cdot (4.9E-6F \cdot {2.02V}^{2} \cdot 4Hz)

Next Step Prepare to Evaluate

∴

P s = 1.65 \cdot (4.9E-6 \cdot {2.02}^{2} \cdot 4)

Next Step Evaluate

∴

P s = 0.000131960136W

Next Step Convert to Output's Unit

∴

P s = 0.131960136mW

LAST Step Rounding Answer

∴

P s = 0.132mW

Switching Power Formula Elements

Variables

Switching Power

Switching Power is called the dynamic power because it arises from the switching of the load.

Symbol: P_s

Measurement: PowerUnit: mW

Note: Value should be greater than 0.

Formulas to find Switching Power

Activity Factor

The Activity factor is defined as the load capacitance which is charged and stores energy during 3/16 of all input transitions. This fraction is called the activity factor or alpha.

Symbol: α

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Activity Factor

Capacitance

Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential.

Symbol: C

Measurement: CapacitanceUnit: μF

Note: Value should be greater than 0.

Formulas to find Capacitance

Base Collector Voltage

Base Collector Voltage is a crucial parameter in transistor biasing. It refers to the voltage difference between the base and collector terminals of the transistor when it is in its active state.

Symbol: V_bc

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Base Collector Voltage

Frequency

Frequency refers to the number of occurrences of a periodic event per time and is measured in cycles/second.

Symbol: f

Measurement: FrequencyUnit: Hz

Note: Value should be greater than 0.

Formulas to find Frequency

Other Formulas to find Switching Power

Go Switching Power in CMOS

P s = ({V dd}^{2}) \cdot f \cdot C

Other formulas in CMOS Power Metrics category

Go Activity Factor

α = \frac{P s}{C \cdot {V bc}^{2} \cdot f}

Go Dynamic Power in CMOS

P dyn = P sc + P s

Go Short-Circuit Power in CMOS

P sc = P dyn - P s

Go Static Power in CMOS

P st = P t - P dyn

How to Evaluate Switching Power?

Switching Power evaluator uses Switching Power = Activity Factor*(Capacitance*Base Collector Voltage^2*Frequency) to evaluate the Switching Power, The Switching Power formula is defined as the dynamic power that arises from the switching of the load. Switching Power is denoted by P_s symbol.

How to evaluate Switching Power using this online evaluator? To use this online evaluator for Switching Power, enter Activity Factor (α), Capacitance (C), Base Collector Voltage (V_bc) & Frequency (f) and hit the calculate button.

FAQs on Switching Power

What is the formula to find Switching Power?

The formula of Switching Power is expressed as Switching Power = Activity Factor*(Capacitance*Base Collector Voltage^2*Frequency). Here is an example- 131.9601 = 1.65*(4.9E-06*2.02^2*4).

How to calculate Switching Power?

With Activity Factor (α), Capacitance (C), Base Collector Voltage (V_bc) & Frequency (f) we can find Switching Power using the formula - Switching Power = Activity Factor*(Capacitance*Base Collector Voltage^2*Frequency).

What are the other ways to Calculate Switching Power?

Here are the different ways to Calculate Switching Power-

Switching Power=(Positive Voltage^2)*Frequency*Capacitance

Can the Switching Power be negative?

No, the Switching Power, measured in Power cannot be negative.

Which unit is used to measure Switching Power?

Switching Power is usually measured using the Milliwatt[mW] for Power. Watt[mW], Kilowatt[mW], Microwatt[mW] are the few other units in which Switching Power can be measured.

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Switching Power Formula

​GoSwitching Power in CMOS Formula

Switching Power Example

Switching Power Solution

Switching Power Formula Elements

Other Formulas to find Switching Power

Other formulas in CMOS Power Metrics category

How to Evaluate Switching Power?

FAQs on Switching Power

Variable Name

GoSwitching Power in CMOS Formula