Input Resistance of Common Emitter Amplifier Calculator

✖Base resistance is a measure of the opposition to current flow in an electrical circuit.ⓘ Base Resistance [R_b]			+10% -10%
✖Base resistance 2 is a measure of the opposition to current flow in an electrical circuit.ⓘ Base Resistance 2 [R_b2]			+10% -10%
✖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.ⓘ Small Signal Input Resistance [R_sm]			+10% -10%

✖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.ⓘ Input Resistance of Common Emitter Amplifier [R_in]

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Formula

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Input Resistance of Common Emitter Amplifier

Formula

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

Example

0.295271 kΩ = {(\frac{1}{1.213 kΩ} + \frac{1}{0.534 kΩ} + \frac{1}{1.45 kΩ})}^{- 1}

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Input Resistance of Common Emitter Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1
R_in = (1/R_b+1/R_b2+1/R_sm)^-1
This formula uses 4 Variables

Variables Used

Input Resistance - (Measured in Ohm) - 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.
Base Resistance - (Measured in Ohm) - Base resistance is a measure of the opposition to current flow in an electrical circuit.
Base Resistance 2 - (Measured in Ohm) - Base resistance 2 is a measure of the opposition to current flow in an electrical circuit.
Small Signal Input Resistance - (Measured in Ohm) - 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.

STEP 1: Convert Input(s) to Base Unit

Base Resistance: 1.213 Kilohm --> 1213 Ohm (Check conversion here)
Base Resistance 2: 0.534 Kilohm --> 534 Ohm (Check conversion here)
Small Signal Input Resistance: 1.45 Kilohm --> 1450 Ohm (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_in = (1/R_b+1/R_b2+1/R_sm)^-1 --> (1/1213+1/534+1/1450)^-1

Evaluating ... ...

R_in = 295.271232094645

STEP 3: Convert Result to Output's Unit

295.271232094645 Ohm -->0.295271232094645 Kilohm (Check conversion here)

FINAL ANSWER

0.295271232094645 ≈ 0.295271 Kilohm <-- Input Resistance

(Calculation completed in 00.004 seconds)

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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< Common Emitter Amplifier Calculators

Overall Feedback Voltage Gain of Common-Collector Amplifier

Go Overall Voltage Gain = ((Collector Base Current Gain+1)*Load Resistance)/((Collector Base Current Gain+1)*Load Resistance+(Collector Base Current Gain+1)*Emitter Resistance+Signal Resistance)

Overall Voltage Gain of Common-Emitter Amplifier

Go Feedback Voltage Gain = -MOSFET Primary Transconductance*(Input Resistance/(Input Resistance+Signal Resistance))*(1/Collector Resistance+1/Load Resistance+1/Finite Output Resistance)^-1

Overall Feedback Voltage Gain of Common-Emitter Amplifier

Go Feedback Voltage Gain = -Common Base Current Gain*Collector Resistance/Emitter Resistance*(Input Resistance/(Input Resistance+Signal Resistance))

Fundamental Voltage in Common-Emitter Amplifier

Go Fundamental Component Voltage = Input Resistance*Base Current

< CV Actions of Common Stage Amplifiers Calculators

Input Resistance of Common Emitter Amplifier

Go Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1

Input Impedance of Common-Base Amplifier

Go Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1)

Fundamental Voltage in Common-Emitter Amplifier

Go Fundamental Component Voltage = Input Resistance*Base Current

Emitter Current of Common-Base Amplifier

Go Emitter Current = Input Voltage/Emitter Resistance

Input Resistance of Common Emitter Amplifier Formula

Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1
R_in = (1/R_b+1/R_b2+1/R_sm)^-1

What does a common emitter amplifier do?

The common emitter amplifier configuration provides voltage gain and is one of the most widely used transistor configurations for electronic circuit design. The common emitter transistor amplifier circuit is one of the mainstay circuits for use within electronic circuit design offers many advantages.

How to Calculate Input Resistance of Common Emitter Amplifier?

Input Resistance of Common Emitter Amplifier calculator uses Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1 to calculate 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 calculate Input Resistance of Common Emitter Amplifier using this online calculator? To use this online calculator 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. Here is how the Input Resistance of Common Emitter Amplifier calculation can be explained with given input values -> 0.000295 = (1/1213+1/534+1/1450)^-1.

FAQ

What is Input Resistance of Common Emitter Amplifier?

The input resistance of common emitter amplifier formula is defined as opposition offered to flow of current in base region of electrical circuit and is represented as R_in = (1/R_b+1/R_b2+1/R_sm)^-1 or Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1. Base resistance is a measure of the opposition to current flow in an electrical circuit, Base resistance 2 is a measure of the opposition to current flow in an electrical circuit & 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.

How to calculate Input Resistance of Common Emitter Amplifier?

The input resistance of common emitter amplifier formula is defined as opposition offered to flow of current in base region of electrical circuit is calculated using Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1. To calculate Input Resistance of Common Emitter Amplifier, you need Base Resistance (R_b), Base Resistance 2 (R_b2) & Small Signal Input Resistance (R_sm). With our tool, you need to enter the respective value for Base Resistance, Base Resistance 2 & Small Signal Input Resistance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Input Resistance?

In this formula, Input Resistance uses Base Resistance, Base Resistance 2 & Small Signal Input Resistance. We can use 3 other way(s) to calculate the same, which is/are as follows -

Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/(Small Signal Input Resistance+(Collector Base Current Gain+1)*Emitter Resistance))^-1
Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/((Total Resistance+Emitter Resistance)*(Collector Base Current Gain+1)))^-1
Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/(Small Signal Input Resistance+(Collector Base Current Gain+1)*Emitter Resistance))^-1

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