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Input Resistance of Common Emitter Amplifier Formula

GoInput Resistance of Common Emitter Amplifier given Small-Signal Input Resistance Formula

GoInput Resistance of Common-Base Circuit Formula

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Input resistance 2 is the opposition that an electrical component or circuit presents to the flow of electrical current when a voltage is applied to it. Check FAQs

R in = {(\frac{1}{R b} + \frac{1}{R b2} + \frac{1}{R sm})}^{- 1}

R_in - Input Resistance?R_b - Base Resistance?R_b2 - Base Resistance 2?R_sm - Small Signal Input Resistance?

Input Resistance of Common Emitter Amplifier Example

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With units

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Here is how the Input Resistance of Common Emitter Amplifier equation looks like with Values.

Here is how the Input Resistance of Common Emitter Amplifier equation looks like with Units.

Here is how the Input Resistance of Common Emitter Amplifier equation looks like.

0.2953 = {(\frac{1}{1.213} + \frac{1}{0.534} + \frac{1}{1.45})}^{- 1}

0.2953kΩ = {(\frac{1}{1.213kΩ} + \frac{1}{0.534kΩ} + \frac{1}{1.45kΩ})}^{- 1}

0.2953 = {(\frac{1}{1.213} + \frac{1}{0.534} + \frac{1}{1.45})}^{- 1}

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Input Resistance of Common Emitter Amplifier Solution

Follow our step by step solution on how to calculate Input Resistance of Common Emitter Amplifier?

FIRST Step Consider the formula

R in = {(\frac{1}{R b} + \frac{1}{R b2} + \frac{1}{R sm})}^{- 1}

Next Step Substitute values of Variables

∴

R in = {(\frac{1}{1.213kΩ} + \frac{1}{0.534kΩ} + \frac{1}{1.45kΩ})}^{- 1}

Next Step Convert Units

∴

R in = {(\frac{1}{1213Ω} + \frac{1}{534Ω} + \frac{1}{1450Ω})}^{- 1}

Next Step Prepare to Evaluate

∴

R in = {(\frac{1}{1213} + \frac{1}{534} + \frac{1}{1450})}^{- 1}

Next Step Evaluate

∴

R in = 295.271232094645Ω

Next Step Convert to Output's Unit

∴

R in = 0.295271232094645kΩ

LAST Step Rounding Answer

∴

R in = 0.2953kΩ

Input Resistance of Common Emitter Amplifier Formula Elements

Variables

Input Resistance

Input resistance 2 is the opposition that an electrical component or circuit presents to the flow of electrical current when a voltage is applied to it.

Symbol: R_in

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Input Resistance

Base Resistance

Base resistance is a measure of the opposition to current flow in an electrical circuit.

Symbol: R_b

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Base Resistance

Base Resistance 2

Base resistance 2 is a measure of the opposition to current flow in an electrical circuit.

Symbol: R_b2

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Base Resistance 2

Small Signal Input Resistance

Small signal input resistance 2 between Base and emitter models how the input impedance between the base and emitter terminals of the transistor changes when a small AC signal is applied.

Symbol: R_sm

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Small Signal Input Resistance

Other Formulas to find Input Resistance

Go Input Resistance of Common Emitter Amplifier given Small-Signal Input Resistance

R in = {(\frac{1}{R b} + \frac{1}{R b2} + \frac{1}{R sm + (β + 1) \cdot R e})}^{- 1}

Go Input Resistance of Common-Base Circuit

R in = \frac{R e \cdot (R out + R L)}{R out + (\frac{R L}{β + 1})}

Go Input Resistance of Common-Collector Amplifier

R in = \frac{V fc}{i b}

Go Input Resistance of Common-Emitter Amplifier given Emitter Resistance

R in = {(\frac{1}{R b} + \frac{1}{R b2} + \frac{1}{(R t + R e) \cdot (β + 1)})}^{- 1}

Other formulas in Common Emitter Amplifier category

Go Emitter Current of Common-Base Amplifier

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

Go Fundamental Voltage in Common-Emitter Amplifier

V fc = R in \cdot i b

Go Input Impedance of Common-Base Amplifier

Z in = {(\frac{1}{R e} + \frac{1}{R sm})}^{- 1}

Go Instantaneous Drain Current using Voltage between Drain and Source

i d = K n \cdot (V ox - V t) \cdot V gs

How to Evaluate Input Resistance of Common Emitter Amplifier?

Input Resistance of Common Emitter Amplifier evaluator uses Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1 to evaluate the Input Resistance, The input resistance of common emitter amplifier formula is defined as opposition offered to flow of current in base region of electrical circuit. Input Resistance is denoted by R_in symbol.

How to evaluate Input Resistance of Common Emitter Amplifier using this online evaluator? To use this online evaluator for Input Resistance of Common Emitter Amplifier, enter Base Resistance (R_b), Base Resistance 2 (R_b2) & Small Signal Input Resistance (R_sm) and hit the calculate button.

FAQs on Input Resistance of Common Emitter Amplifier

What is the formula to find Input Resistance of Common Emitter Amplifier?

The formula of Input Resistance of Common Emitter Amplifier is expressed as Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1. Here is an example- 0.000295 = (1/1213+1/534+1/1450)^-1.

How to calculate Input Resistance of Common Emitter Amplifier?

With Base Resistance (R_b), Base Resistance 2 (R_b2) & Small Signal Input Resistance (R_sm) we can find Input Resistance of Common Emitter Amplifier using the formula - Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1.

What are the other ways to Calculate Input Resistance?

Here are the different ways to Calculate Input Resistance-

Input Resistance=(1/Base Resistance+1/Base Resistance 2+1/(Small Signal Input Resistance+(Collector Base Current Gain+1)*Emitter Resistance))^-1
Input Resistance=(Emitter Resistance*(Finite Output Resistance+Load Resistance))/(Finite Output Resistance+(Load Resistance/(Collector Base Current Gain+1)))
Input Resistance=Fundamental Component Voltage/Base Current

Can the Input Resistance of Common Emitter Amplifier be negative?

No, the Input Resistance of Common Emitter Amplifier, measured in Electric Resistance cannot be negative.

Which unit is used to measure Input Resistance of Common Emitter Amplifier?

Input Resistance of Common Emitter Amplifier 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 Common Emitter Amplifier can be measured.

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Input Resistance of Common Emitter Amplifier Formula

​GoInput Resistance of Common Emitter Amplifier given Small-Signal Input Resistance Formula

​GoInput Resistance of Common-Base Circuit Formula

Input Resistance of Common Emitter Amplifier Example

Input Resistance of Common Emitter Amplifier Solution

Input Resistance of Common Emitter Amplifier Formula Elements

Other Formulas to find Input Resistance

Other formulas in Common Emitter Amplifier category

How to Evaluate Input Resistance of Common Emitter Amplifier?

FAQs on Input Resistance of Common Emitter Amplifier

Variable Name

GoInput Resistance of Common Emitter Amplifier given Small-Signal Input Resistance Formula

GoInput Resistance of Common-Base Circuit Formula