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Emitter Current of BJT Differential Amplifier Formula

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Emitter Current is defined as the the combination of the collector AND the base current combined. Check FAQs

i E = \frac{V id}{2 \cdot r E + 2 \cdot R CE}

i_E - Emitter Current?V_id - Differential Input Voltage?r_E - Base Emitter Resistance?R_CE - Collector Emitter Resistance?

Emitter Current of BJT Differential Amplifier Example

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Here is how the Emitter Current of BJT Differential Amplifier equation looks like with Values.

Here is how the Emitter Current of BJT Differential Amplifier equation looks like with Units.

Here is how the Emitter Current of BJT Differential Amplifier equation looks like.

13.8889 = \frac{7.5}{2 \cdot 0.13 + 2 \cdot 0.14}

13.8889mA = \frac{7.5V}{2 \cdot 0.13kΩ + 2 \cdot 0.14kΩ}

13.8889 = \frac{7.5}{2 \cdot 0.13 + 2 \cdot 0.14}

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Emitter Current of BJT Differential Amplifier Solution

Follow our step by step solution on how to calculate Emitter Current of BJT Differential Amplifier?

FIRST Step Consider the formula

i E = \frac{V id}{2 \cdot r E + 2 \cdot R CE}

Next Step Substitute values of Variables

∴

i E = \frac{7.5V}{2 \cdot 0.13kΩ + 2 \cdot 0.14kΩ}

Next Step Convert Units

∴

i E = \frac{7.5V}{2 \cdot 130Ω + 2 \cdot 140Ω}

Next Step Prepare to Evaluate

∴

i E = \frac{7.5}{2 \cdot 130 + 2 \cdot 140}

Next Step Evaluate

∴

i E = 0.0138888888888889A

Next Step Convert to Output's Unit

∴

i E = 13.8888888888889mA

LAST Step Rounding Answer

∴

i E = 13.8889mA

Emitter Current of BJT Differential Amplifier Formula Elements

Variables

Emitter Current

Emitter Current is defined as the the combination of the collector AND the base current combined.

Symbol: i_E

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Formulas to find Emitter Current

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

Base Emitter Resistance

Base Emitter Resistance is a small resistance that is typically in the range of a few ohms and is connected with base and emitter junctions.

Symbol: r_E

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Base Emitter Resistance

Collector Emitter Resistance

Collector Emitter Resistance is a large resistance that is typically in the range of a few hundred ohms to thousand ohms and is connected with collector and emitter junctions.

Symbol: R_CE

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Collector Emitter Resistance

Other formulas in Current and Voltage category

Go Maximum Input Common-Mode Range Voltage of BJT Differential Amplifier

V cm = V i + (α \cdot 0.5 \cdot i \cdot R C)

Go First Emitter Current of BJT Differential Amplifier

i E1 = \frac{i}{1 + e^{\frac{- V id}{V th}}}

Go First Collector Current of BJT Differential Amplifier

i C1 = \frac{α \cdot i}{1 + e^{\frac{- V id}{V th}}}

Go Collector Current of BJT Differential Amplifier given Emitter Current

i c = α \cdot i E

How to Evaluate Emitter Current of BJT Differential Amplifier?

Emitter Current of BJT Differential Amplifier evaluator uses Emitter Current = Differential Input Voltage/(2*Base Emitter Resistance+2*Collector Emitter Resistance) to evaluate the Emitter Current, The Emitter current of BJT differential amplifier formula is defined as the total current flowing into or out of the emitter terminal of the transistor pair. Emitter Current is denoted by i_E symbol.

How to evaluate Emitter Current of BJT Differential Amplifier using this online evaluator? To use this online evaluator for Emitter Current of BJT Differential Amplifier, enter Differential Input Voltage (V_id), Base Emitter Resistance (r_E) & Collector Emitter Resistance (R_CE) and hit the calculate button.

FAQs on Emitter Current of BJT Differential Amplifier

What is the formula to find Emitter Current of BJT Differential Amplifier?

The formula of Emitter Current of BJT Differential Amplifier is expressed as Emitter Current = Differential Input Voltage/(2*Base Emitter Resistance+2*Collector Emitter Resistance). Here is an example- 13888.89 = 7.5/(2*130+2*140).

How to calculate Emitter Current of BJT Differential Amplifier?

With Differential Input Voltage (V_id), Base Emitter Resistance (r_E) & Collector Emitter Resistance (R_CE) we can find Emitter Current of BJT Differential Amplifier using the formula - Emitter Current = Differential Input Voltage/(2*Base Emitter Resistance+2*Collector Emitter Resistance).

Can the Emitter Current of BJT Differential Amplifier be negative?

Yes, the Emitter Current of BJT Differential Amplifier, measured in Electric Current can be negative.

Which unit is used to measure Emitter Current of BJT Differential Amplifier?

Emitter Current of BJT Differential Amplifier is usually measured using the Milliampere[mA] for Electric Current. Ampere[mA], Microampere[mA], Centiampere[mA] are the few other units in which Emitter Current of BJT Differential Amplifier can be measured.

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