FormulaDen.com

Physics Chemistry Math Chemical Engineering Civil Electrical Electronics Electronics and Instrumentation Materials Science Mechanical Production Engineering Financial Health

Emitter Resistance of BJT Formula

GoEmitter Resistance given Threshold Voltage Formula

GoEmitter Resistance given Emitter Current Formula

Fx Copy

LaTeX Copy

Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor. Check FAQs

R e = \frac{V ss}{i si}

R_e - Emitter Resistance?V_ss - Small Signal?i_si - Signal Current?

Emitter Resistance of BJT Example

With values

With units

Only example

Here is how the Emitter Resistance of BJT equation looks like with Values.

Here is how the Emitter Resistance of BJT equation looks like with Units.

Here is how the Emitter Resistance of BJT equation looks like.

1.2075 = \frac{3.2}{2.65}

1.2075kΩ = \frac{3.2V}{2.65mA}

1.2075 = \frac{3.2}{2.65}

Tip: Use pencil ( Pencil

) icon above to edit Input Values and Units.

Calculate

Recalculate

Solution

Copy

Reset

You are here -

Home » Category

Engineering » Category

Electronics » Category

Analog Electronics » fx Emitter Resistance of BJT

Emitter Resistance of BJT Solution

Follow our step by step solution on how to calculate Emitter Resistance of BJT?

FIRST Step Consider the formula

R e = \frac{V ss}{i si}

Next Step Substitute values of Variables

∴

R e = \frac{3.2V}{2.65mA}

Next Step Convert Units

∴

R e = \frac{3.2V}{0.0026A}

Next Step Prepare to Evaluate

∴

R e = \frac{3.2}{0.0026}

Next Step Evaluate

∴

R e = 1207.54716981132Ω

Next Step Convert to Output's Unit

∴

R e = 1.20754716981132kΩ

LAST Step Rounding Answer

∴

R e = 1.2075kΩ

Emitter Resistance of BJT Formula Elements

Variables

Emitter Resistance

Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.

Symbol: R_e

Measurement: Electric ResistanceUnit: kΩ

Note: Value can be positive or negative.

Formulas to find Emitter Resistance

Small Signal

Small signal is an AC signal (more technically, a signal having zero average value) superimposed on a bias signal (or superimposed on a DC constant signal).

Symbol: V_ss

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Small Signal

Signal Current

Signal current is the current in the amplified output current of a transistor.

Symbol: i_si

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Formulas to find Signal Current

Other Formulas to find Emitter Resistance

Go Emitter Resistance given Threshold Voltage

R e = \frac{V th}{I e}

Go Emitter Resistance given Emitter Current

R e = \frac{V th}{I e}

Other formulas in Resistance category

Go Small-Signal Input Resistance between Base and Emitter

R s = \frac{V in}{I B}

Go Small-Signal Input Resistance between Base and Emitter using Transconductance

R s = \frac{β}{G m}

Go Small-Signal Input Resistance between Base and Emitter using Base Current

R s = \frac{V th}{I B}

Go Small-Signal Input Resistance given Emitter Current

V ss = i si \cdot R e

How to Evaluate Emitter Resistance of BJT?

Emitter Resistance of BJT evaluator uses Emitter Resistance = Small Signal/Signal Current to evaluate the Emitter Resistance, Emitter resistance of BJT suggests that for a small signal, the transistor behaves as a voltage-controlled current source. The input port of the controlled current source is between base and emitter and the output port is in between collector and emitter. Emitter Resistance is denoted by R_e symbol.

How to evaluate Emitter Resistance of BJT using this online evaluator? To use this online evaluator for Emitter Resistance of BJT, enter Small Signal (V_ss) & Signal Current (i_si) and hit the calculate button.

FAQs on Emitter Resistance of BJT

What is the formula to find Emitter Resistance of BJT?

The formula of Emitter Resistance of BJT is expressed as Emitter Resistance = Small Signal/Signal Current. Here is an example- 0.001208 = 3.2/0.00265.

How to calculate Emitter Resistance of BJT?

With Small Signal (V_ss) & Signal Current (i_si) we can find Emitter Resistance of BJT using the formula - Emitter Resistance = Small Signal/Signal Current.

What are the other ways to Calculate Emitter Resistance?

Here are the different ways to Calculate Emitter Resistance-

Emitter Resistance=Threshold Voltage/Emitter Current
Emitter Resistance=Threshold Voltage/Emitter Current

Can the Emitter Resistance of BJT be negative?

Yes, the Emitter Resistance of BJT, measured in Electric Resistance can be negative.

Which unit is used to measure Emitter Resistance of BJT?

Emitter Resistance of BJT is usually measured using the Kilohm[kΩ] for Electric Resistance. Ohm[kΩ], Megohm[kΩ], Microhm[kΩ] are the few other units in which Emitter Resistance of BJT can be measured.

Let Others Know

✖

Facebook

Twitter

Copied!

Emitter Resistance of BJT Formula

​GoEmitter Resistance given Threshold Voltage Formula

​GoEmitter Resistance given Emitter Current Formula

Emitter Resistance of BJT Example

Emitter Resistance of BJT Solution

Emitter Resistance of BJT Formula Elements

Other Formulas to find Emitter Resistance

Other formulas in Resistance category

How to Evaluate Emitter Resistance of BJT?

FAQs on Emitter Resistance of BJT

Variable Name

GoEmitter Resistance given Threshold Voltage Formula

GoEmitter Resistance given Emitter Current Formula