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Output Resistance of Emitter Follower Formula

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A finite resistance simply means that the resistance in a circuit is not infinite or zero. In other words, the circuit has some amount of resistance, which can affect the behavior of the circuit. Check FAQs

R fi = (\frac{1}{R L} + \frac{1}{V sig} + \frac{1}{R e}) + \frac{\frac{1}{Z base} + \frac{1}{R sig}}{β + 1}

R_fi - Finite Resistance?R_L - Load Resistance?V_sig - Small Signal Voltage?R_e - Emitter Resistance?Z_base - Base Impedance?R_sig - Signal Resistance?β - Collector Base Current Gain?

Output Resistance of Emitter Follower Example

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

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

Here is how the Output Resistance of Emitter Follower equation looks like.

0.0643 = (\frac{1}{1.013} + \frac{1}{7.58} + \frac{1}{0.067}) + \frac{\frac{1}{1.2E-6} + \frac{1}{1.12}}{12 + 1}

0.0643kΩ = (\frac{1}{1.013kΩ} + \frac{1}{7.58V} + \frac{1}{0.067kΩ}) + \frac{\frac{1}{1.2E-6kΩ} + \frac{1}{1.12kΩ}}{12 + 1}

0.0643 = (\frac{1}{1.013} + \frac{1}{7.58} + \frac{1}{0.067}) + \frac{\frac{1}{1.2E-6} + \frac{1}{1.12}}{12 + 1}

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Output Resistance of Emitter Follower Solution

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

FIRST Step Consider the formula

R fi = (\frac{1}{R L} + \frac{1}{V sig} + \frac{1}{R e}) + \frac{\frac{1}{Z base} + \frac{1}{R sig}}{β + 1}

Next Step Substitute values of Variables

∴

R fi = (\frac{1}{1.013kΩ} + \frac{1}{7.58V} + \frac{1}{0.067kΩ}) + \frac{\frac{1}{1.2E-6kΩ} + \frac{1}{1.12kΩ}}{12 + 1}

Next Step Convert Units

∴

R fi = (\frac{1}{1013Ω} + \frac{1}{7.58V} + \frac{1}{67Ω}) + \frac{\frac{1}{0.0012Ω} + \frac{1}{1120Ω}}{12 + 1}

Next Step Prepare to Evaluate

∴

R fi = (\frac{1}{1013} + \frac{1}{7.58} + \frac{1}{67}) + \frac{\frac{1}{0.0012} + \frac{1}{1120}}{12 + 1}

Next Step Evaluate

∴

R fi = 64.2504714452203Ω

Next Step Convert to Output's Unit

∴

R fi = 0.0642504714452203kΩ

LAST Step Rounding Answer

∴

R fi = 0.0643kΩ

Output Resistance of Emitter Follower Formula Elements

Variables

Finite Resistance

A finite resistance simply means that the resistance in a circuit is not infinite or zero. In other words, the circuit has some amount of resistance, which can affect the behavior of the circuit.

Symbol: R_fi

Measurement: Electric ResistanceUnit: kΩ

Note: Value can be positive or negative.

Formulas to find Finite Resistance

Load Resistance

Load resistance is the resistance value of load given for the network.

Symbol: R_L

Measurement: Electric ResistanceUnit: kΩ