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Input Impedance of Common-Base Amplifier Formula

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Input Impedance is a measure of how much resistance an electronic device has to the flow of current in its input circuitry. Check FAQs

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

Z_in - Input Impedance?R_e - Emitter Resistance?R_sm - Small Signal Input Resistance?

Input Impedance of Common-Base Amplifier Example

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Here is how the Input Impedance of Common-Base Amplifier equation looks like with Values.

Here is how the Input Impedance of Common-Base Amplifier equation looks like with Units.

Here is how the Input Impedance of Common-Base Amplifier equation looks like.

0.064 = {(\frac{1}{0.067} + \frac{1}{1.45})}^{- 1}

0.064kΩ = {(\frac{1}{0.067kΩ} + \frac{1}{1.45kΩ})}^{- 1}

0.064 = {(\frac{1}{0.067} + \frac{1}{1.45})}^{- 1}

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Input Impedance of Common-Base Amplifier Solution

Follow our step by step solution on how to calculate Input Impedance of Common-Base Amplifier?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

Z in = {(\frac{1}{0.067kΩ} + \frac{1}{1.45kΩ})}^{- 1}

Next Step Convert Units

∴

Z in = {(\frac{1}{67Ω} + \frac{1}{1450Ω})}^{- 1}

Next Step Prepare to Evaluate

∴

Z in = {(\frac{1}{67} + \frac{1}{1450})}^{- 1}

Next Step Evaluate

∴

Z in = 64.0408701384311Ω

Next Step Convert to Output's Unit

∴

Z in = 0.0640408701384311kΩ

LAST Step Rounding Answer

∴

Z in = 0.064kΩ

Input Impedance of Common-Base Amplifier Formula Elements

Variables

Input Impedance

Input Impedance is a measure of how much resistance an electronic device has to the flow of current in its input circuitry.

Symbol: Z_in

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Input Impedance

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 should be greater than 0.

Formulas to find Emitter Resistance

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 in Common Base 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 Resistance of Common Emitter Amplifier

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

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}

How to Evaluate Input Impedance of Common-Base Amplifier?

Input Impedance of Common-Base Amplifier evaluator uses Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1) to evaluate the Input Impedance, Input Impedance of Common-Base Amplifier is a measure of how much resistance an electronic device has to the flow of current in its input circuitry. It is typically measured in ohms (Ω) and is important to ensure that the signal being input into a device is not degraded due to excessive resistance. Input Impedance is denoted by Z_in symbol.

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

FAQs on Input Impedance of Common-Base Amplifier

What is the formula to find Input Impedance of Common-Base Amplifier?

The formula of Input Impedance of Common-Base Amplifier is expressed as Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1). Here is an example- 6.4E-5 = (1/67+1/1450)^(-1).

How to calculate Input Impedance of Common-Base Amplifier?

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

Can the Input Impedance of Common-Base Amplifier be negative?

No, the Input Impedance of Common-Base Amplifier, measured in Electric Resistance cannot be negative.

Which unit is used to measure Input Impedance of Common-Base Amplifier?

Input Impedance of Common-Base 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 Impedance of Common-Base Amplifier can be measured.

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Input Impedance of Common-Base Amplifier Formula

Input Impedance of Common-Base Amplifier Example

Input Impedance of Common-Base Amplifier Solution

Input Impedance of Common-Base Amplifier Formula Elements

Other formulas in Common Base Amplifier category

How to Evaluate Input Impedance of Common-Base Amplifier?

FAQs on Input Impedance of Common-Base Amplifier

Variable Name