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Common Mode Gain of BJT Differential Amplifier Formula

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Common Mode Gain refers to the amplification given to signals that appear on both inputs relative to the common (typically ground). Check FAQs

A cm = \frac{V od}{V id}

A_cm - Common Mode Gain?V_od - Differential Output Voltage?V_id - Differential Input Voltage?

Common Mode Gain of BJT Differential Amplifier Example

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Here is how the Common Mode Gain of BJT Differential Amplifier equation looks like with Values.

Here is how the Common Mode Gain of BJT Differential Amplifier equation looks like with Units.

Here is how the Common Mode Gain of BJT Differential Amplifier equation looks like.

2.1333 = \frac{16}{7.5}

2.1333 = \frac{16V}{7.5V}

2.1333 = \frac{16}{7.5}

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Common Mode Gain of BJT Differential Amplifier Solution

Follow our step by step solution on how to calculate Common Mode Gain of BJT Differential Amplifier?

FIRST Step Consider the formula

A cm = \frac{V od}{V id}

Next Step Substitute values of Variables

∴

A cm = \frac{16V}{7.5V}

Next Step Prepare to Evaluate

∴

A cm = \frac{16}{7.5}

Next Step Evaluate

∴

A cm = 2.13333333333333

LAST Step Rounding Answer

∴

A cm = 2.1333

Common Mode Gain of BJT Differential Amplifier Formula Elements

Variables

Common Mode Gain

Common Mode Gain refers to the amplification given to signals that appear on both inputs relative to the common (typically ground).

Symbol: A_cm

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Common Mode Gain

Differential Output Voltage

Differential Output Voltage is defined as a measure of the voltage between two distinct output signals.

Symbol: V_od

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Differential Output Voltage

Differential Input Voltage

Differential Input Voltage is defined as signal input circuit where SIGNAL LO and SIGNAL HI are electrically floating with respect to ANALOG GROUND.

Symbol: V_id

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Differential Input Voltage

Other formulas in DC Offset category

Go Common Mode Rejection Ratio of BJT Differential Amplifier in dB

CMRR = 20 \cdot \log 10 (mod \underset{̲}{u} s (\frac{A d}{A cm}))

Go Input Offset Current of Differential Amplifier

I os = mod \underset{̲}{u} s (I B1 - I B2)

Go Input Offset Voltage of BJT Differential Amplifier

V os = V th \cdot (\frac{ΔR c}{R C})

How to Evaluate Common Mode Gain of BJT Differential Amplifier?

Common Mode Gain of BJT Differential Amplifier evaluator uses Common Mode Gain = Differential Output Voltage/Differential Input Voltage to evaluate the Common Mode Gain, Common Mode Gain of BJT Differential Amplifier is defined as to the amplification given to signals that appear on both inputs relative to the common (typically ground). Common Mode Gain is denoted by A_cm symbol.

How to evaluate Common Mode Gain of BJT Differential Amplifier using this online evaluator? To use this online evaluator for Common Mode Gain of BJT Differential Amplifier, enter Differential Output Voltage (V_od) & Differential Input Voltage (V_id) and hit the calculate button.

FAQs on Common Mode Gain of BJT Differential Amplifier

What is the formula to find Common Mode Gain of BJT Differential Amplifier?

The formula of Common Mode Gain of BJT Differential Amplifier is expressed as Common Mode Gain = Differential Output Voltage/Differential Input Voltage. Here is an example- 3.333333 = 16/7.5.

How to calculate Common Mode Gain of BJT Differential Amplifier?

With Differential Output Voltage (V_od) & Differential Input Voltage (V_id) we can find Common Mode Gain of BJT Differential Amplifier using the formula - Common Mode Gain = Differential Output Voltage/Differential Input Voltage.

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Common Mode Gain of BJT Differential Amplifier Formula

Common Mode Gain of BJT Differential Amplifier Example

Common Mode Gain of BJT Differential Amplifier Solution

Common Mode Gain of BJT Differential Amplifier Formula Elements

Other formulas in DC Offset category

How to Evaluate Common Mode Gain of BJT Differential Amplifier?

FAQs on Common Mode Gain of BJT Differential Amplifier

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