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Power Supply Rejection Ratio Formula

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Power Supply Rejection Ratio is the ratio of the change in input offset voltage with respect to the change in power supply voltage. Check FAQs

P sr = 20 \cdot \log 10 (\frac{V in}{V out})

P_sr - Power Supply Rejection Ratio?V_in - Input Voltage Ripple?V_out - Output Voltage Ripple?

Power Supply Rejection Ratio Example

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Here is how the Power Supply Rejection Ratio equation looks like with Values.

Here is how the Power Supply Rejection Ratio equation looks like with Units.

Here is how the Power Supply Rejection Ratio equation looks like.

2.9635 = 20 \cdot \log 10 (\frac{7.23}{5.14})

2.9635dB = 20 \cdot \log 10 (\frac{7.23V}{5.14V})

2.9635 = 20 \cdot \log 10 (\frac{7.23}{5.14})

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Power Supply Rejection Ratio Solution

Follow our step by step solution on how to calculate Power Supply Rejection Ratio?

FIRST Step Consider the formula

P sr = 20 \cdot \log 10 (\frac{V in}{V out})

Next Step Substitute values of Variables

∴

P sr = 20 \cdot \log 10 (\frac{7.23V}{5.14V})

Next Step Prepare to Evaluate

∴

P sr = 20 \cdot \log 10 (\frac{7.23}{5.14})

Next Step Evaluate

∴

P sr = 2.9635035659851dB

LAST Step Rounding Answer

∴

P sr = 2.9635dB

Power Supply Rejection Ratio Formula Elements

Variables

Functions

Power Supply Rejection Ratio

Power Supply Rejection Ratio is the ratio of the change in input offset voltage with respect to the change in power supply voltage.

Symbol: P_sr

Measurement: NoiseUnit: dB

Note: Value should be greater than 0.

Formulas to find Power Supply Rejection Ratio

Input Voltage Ripple

Input Voltage Ripple is the ripple voltage of the input.

Symbol: V_in

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Input Voltage Ripple

Output Voltage Ripple

Output Voltage Ripple is the ripple voltage of the output.

Symbol: V_out

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Output Voltage Ripple

log10

The common logarithm, also known as the base-10 logarithm or the decimal logarithm, is a mathematical function that is the inverse of the exponential function.

Syntax: log10(Number)

Other formulas in CMOS Power Metrics category

Go Activity Factor

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

Go Switching Power

P s = α \cdot (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

How to Evaluate Power Supply Rejection Ratio?

Power Supply Rejection Ratio evaluator uses Power Supply Rejection Ratio = 20*log10(Input Voltage Ripple/Output Voltage Ripple) to evaluate the Power Supply Rejection Ratio, The Power Supply rejection ratio is the ratio of the change in input offset voltage with respect to the change in power supply voltage. Power Supply Rejection Ratio is denoted by P_sr symbol.

How to evaluate Power Supply Rejection Ratio using this online evaluator? To use this online evaluator for Power Supply Rejection Ratio, enter Input Voltage Ripple (V_in) & Output Voltage Ripple (V_out) and hit the calculate button.

FAQs on Power Supply Rejection Ratio

What is the formula to find Power Supply Rejection Ratio?

The formula of Power Supply Rejection Ratio is expressed as Power Supply Rejection Ratio = 20*log10(Input Voltage Ripple/Output Voltage Ripple). Here is an example- 2.963504 = 20*log10(7.23/5.14).

How to calculate Power Supply Rejection Ratio?

With Input Voltage Ripple (V_in) & Output Voltage Ripple (V_out) we can find Power Supply Rejection Ratio using the formula - Power Supply Rejection Ratio = 20*log10(Input Voltage Ripple/Output Voltage Ripple). This formula also uses Common Logarithm Function function(s).

Can the Power Supply Rejection Ratio be negative?

No, the Power Supply Rejection Ratio, measured in Noise cannot be negative.

Which unit is used to measure Power Supply Rejection Ratio?

Power Supply Rejection Ratio is usually measured using the Decibel[dB] for Noise. Neper[dB], MilliDecibel[dB] are the few other units in which Power Supply Rejection Ratio can be measured.

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Power Supply Rejection Ratio Formula

Power Supply Rejection Ratio Example

Power Supply Rejection Ratio Solution

Power Supply Rejection Ratio Formula Elements

Other formulas in CMOS Power Metrics category

How to Evaluate Power Supply Rejection Ratio?

FAQs on Power Supply Rejection Ratio

Variable Name