FormulaDen.com

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

Input Resistance of BJT Formula

GoInput Resistance of Common Gate Circuit given Transconductance Formula

Fx Copy

LaTeX Copy

Input Resistance is the resistance seen by the current source or voltage source which drives the circuit. Check FAQs

R in = \frac{V in}{i si}

R_in - Input Resistance?V_in - Input Voltage?i_si - Signal Current?

Input Resistance of BJT Example

With values

With units

Only example

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

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

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

0.9434 = \frac{2.5}{2.65}

0.9434kΩ = \frac{2.5V}{2.65mA}

0.9434 = \frac{2.5}{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 Input Resistance of BJT

Input Resistance of BJT Solution

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

FIRST Step Consider the formula

R in = \frac{V in}{i si}

Next Step Substitute values of Variables

∴

R in = \frac{2.5V}{2.65mA}

Next Step Convert Units

∴

R in = \frac{2.5V}{0.0026A}

Next Step Prepare to Evaluate

∴

R in = \frac{2.5}{0.0026}

Next Step Evaluate

∴

R in = 943.396226415094Ω

Next Step Convert to Output's Unit

∴

R in = 0.943396226415094kΩ

LAST Step Rounding Answer

∴

R in = 0.9434kΩ

Input Resistance of BJT Formula Elements

Variables

Input Resistance

Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.

Symbol: R_in

Measurement: Electric ResistanceUnit: kΩ

Note: Value can be positive or negative.

Formulas to find Input Resistance

Input Voltage

Input voltage is the voltage supplied to the device.

Symbol: V_in

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Input Voltage

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 Input Resistance

Go Input Resistance of Common Gate Circuit given Transconductance

R in = (\frac{1}{G m}) + (\frac{R L}{G m \cdot R fo})

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 Emitter Resistance given Threshold Voltage

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

How to Evaluate Input Resistance of BJT?

Input Resistance of BJT evaluator uses Input Resistance = Input Voltage/Signal Current to evaluate the Input Resistance, The Input resistance of BJT in terms of emitter resistance formula is defined as the resistance seen by the current source or voltage source which drives the circuit. Input Resistance is denoted by R_in symbol.

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

FAQs on Input Resistance of BJT

What is the formula to find Input Resistance of BJT?

The formula of Input Resistance of BJT is expressed as Input Resistance = Input Voltage/Signal Current. Here is an example- 0.000943 = 2.5/0.00265.

How to calculate Input Resistance of BJT?

With Input Voltage (V_in) & Signal Current (i_si) we can find Input Resistance of BJT using the formula - Input Resistance = Input Voltage/Signal Current.

What are the other ways to Calculate Input Resistance?

Here are the different ways to Calculate Input Resistance-

Input Resistance=(1/Transconductance)+(Load Resistance/(Transconductance*Finite Output Resistance))

Can the Input Resistance of BJT be negative?

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

Which unit is used to measure Input Resistance of BJT?

Input 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 Input Resistance of BJT can be measured.

Let Others Know

✖

Facebook

Twitter

Copied!

Input Resistance of BJT Formula

​GoInput Resistance of Common Gate Circuit given Transconductance Formula

Input Resistance of BJT Example

Input Resistance of BJT Solution

Input Resistance of BJT Formula Elements

Other Formulas to find Input Resistance

Other formulas in Resistance category

How to Evaluate Input Resistance of BJT?

FAQs on Input Resistance of BJT

Variable Name

GoInput Resistance of Common Gate Circuit given Transconductance Formula