Output Resistance of Emitter Follower Calculator

✖Load resistance is the resistance value of load given for the network.ⓘ Load Resistance [R_L]			+10% -10%
✖The Small signal voltage is a quantitative expression of the potential difference in electrical charge between two points in an electrical field.ⓘ Small Signal Voltage [V_sig]			+10% -10%
✖Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.ⓘ Emitter Resistance [R_e]			+10% -10%
✖Base Impedance is the ratio of the base voltage to the base current. It is denoted as Zbase.ⓘ Base Impedance [Z_base]			+10% -10%
✖Signal resistance is the resistance which is fed with the signal voltage source of an Amplifier.ⓘ Signal Resistance [R_sig]			+10% -10%
✖Collector Base Current Gain is a term used in electronic circuits to describe the maximum current that a collector-emitter junction of a transistor can tolerate without breaking down.ⓘ Collector Base Current Gain [β]			+10% -10%

✖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.ⓘ Output Resistance of Emitter Follower [R_fi]

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Output Resistance of Emitter Follower Solution

STEP 0: Pre-Calculation Summary

Formula Used

Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1)
R_fi = (1/R_L+1/V_sig+1/R_e)+(1/Z_base+1/R_sig)/(β+1)
This formula uses 7 Variables

Variables Used

Finite Resistance - (Measured in Ohm) - 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.
Load Resistance - (Measured in Ohm) - Load resistance is the resistance value of load given for the network.
Small Signal Voltage - (Measured in Volt) - The Small signal voltage is a quantitative expression of the potential difference in electrical charge between two points in an electrical field.
Emitter Resistance - (Measured in Ohm) - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.
Base Impedance - (Measured in Ohm) - Base Impedance is the ratio of the base voltage to the base current. It is denoted as Zbase.
Signal Resistance - (Measured in Ohm) - Signal resistance is the resistance which is fed with the signal voltage source of an Amplifier.
Collector Base Current Gain - Collector Base Current Gain is a term used in electronic circuits to describe the maximum current that a collector-emitter junction of a transistor can tolerate without breaking down.

STEP 1: Convert Input(s) to Base Unit

Load Resistance: 1.013 Kilohm --> 1013 Ohm (Check conversion here)
Small Signal Voltage: 7.58 Volt --> 7.58 Volt No Conversion Required
Emitter Resistance: 0.067 Kilohm --> 67 Ohm (Check conversion here)
Base Impedance: 1.2E-06 Kilohm --> 0.0012 Ohm (Check conversion here)
Signal Resistance: 1.12 Kilohm --> 1120 Ohm (Check conversion here)
Collector Base Current Gain: 12 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_fi = (1/R_L+1/V_sig+1/R_e)+(1/Z_base+1/R_sig)/(β+1) --> (1/1013+1/7.58+1/67)+(1/0.0012+1/1120)/(12+1)

Evaluating ... ...

R_fi = 64.2504714452203

STEP 3: Convert Result to Output's Unit

64.2504714452203 Ohm -->0.0642504714452203 Kilohm (Check conversion here)

FINAL ANSWER

0.0642504714452203 ≈ 0.06425 Kilohm <-- Finite 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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Vishwakarma Government Engineering College (VGEC), Ahmedabad

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< Emitter Follower Calculators

Output Resistance of Emitter Follower

LaTeX Go Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1)

Collector Current in Active Region when Transistor Acts as Amplifier

LaTeX Go Collector Current = Saturation Current*e^(Voltage across Base Emitter Junction/Threshold Voltage)

Saturation Current of Emitter Follower

LaTeX Go Saturation Current = Collector Current/e^(Voltage across Base Emitter Junction/Threshold Voltage)

Input Resistance of Emitter Follower

LaTeX Go Input Resistance = 1/(1/Signal Resistance in Base+1/Base Resistance)

< Multi Stage Transistor Amplifiers Calculators

Open Circuit Bipolar Cascode Voltage Gain

LaTeX Go Bipolar Cascode Voltage Gain = -MOSFET Primary Transconductance*(MOSFET Secondary Transconductance*Finite Output Resistance)*(1/Finite Output Resistance of Transistor 1+1/Small Signal Input Resistance)^-1

Drain Resistance of Cascode Amplifier

LaTeX Go Drain Resistance = (Output Voltage Gain/(MOSFET Primary Transconductance^2*Finite Output Resistance))

Output voltage gain of MOS Cascode Amplifier

LaTeX Go Output Voltage Gain = -MOSFET Primary Transconductance^2*Finite Output Resistance*Drain Resistance

Equivalent Resistance of Cascode Amplifier

LaTeX Go Resistance between Drain and Ground = (1/Finite Output Resistance of Transistor 1+1/Input Resistance)^-1

Output Resistance of Emitter Follower Formula

LaTeX Go

What is meant by emitter follower?

Emitter follower is a case of the negative current feedback circuit. This is mostly used as a last-stage amplifier in signal generator circuits. The important features of Emitter Follower are − It has high input impedance. It has low output impedance.

How to Calculate Output Resistance of Emitter Follower?

Output Resistance of Emitter Follower calculator uses Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1) to calculate the Finite Resistance, The output resistance of emitter follower formula is a measure of how much the amplifier's output voltage changes in response to changes in the load connected to its output. Finite Resistance is denoted by R_fi symbol.

How to calculate Output Resistance of Emitter Follower using this online calculator? To use this online calculator for Output Resistance of Emitter Follower, enter Load Resistance (R_L), Small Signal Voltage (V_sig), Emitter Resistance (R_e), Base Impedance (Z_base), Signal Resistance (R_sig) & Collector Base Current Gain (β) and hit the calculate button. Here is how the Output Resistance of Emitter Follower calculation can be explained with given input values -> 6.4E-5 = (1/1013+1/7.58+1/67)+(1/0.0012+1/1120)/(12+1).

FAQ

What is Output Resistance of Emitter Follower?

The output resistance of emitter follower formula is a measure of how much the amplifier's output voltage changes in response to changes in the load connected to its output and is represented as R_fi = (1/R_L+1/V_sig+1/R_e)+(1/Z_base+1/R_sig)/(β+1) or Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1). Load resistance is the resistance value of load given for the network, The Small signal voltage is a quantitative expression of the potential difference in electrical charge between two points in an electrical field, Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor, Base Impedance is the ratio of the base voltage to the base current. It is denoted as Zbase, Signal resistance is the resistance which is fed with the signal voltage source of an Amplifier & Collector Base Current Gain is a term used in electronic circuits to describe the maximum current that a collector-emitter junction of a transistor can tolerate without breaking down.

How to calculate Output Resistance of Emitter Follower?

The output resistance of emitter follower formula is a measure of how much the amplifier's output voltage changes in response to changes in the load connected to its output is calculated using Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1). To calculate Output Resistance of Emitter Follower, you need Load Resistance (R_L), Small Signal Voltage (V_sig), Emitter Resistance (R_e), Base Impedance (Z_base), Signal Resistance (R_sig) & Collector Base Current Gain (β). With our tool, you need to enter the respective value for Load Resistance, Small Signal Voltage, Emitter Resistance, Base Impedance, Signal Resistance & Collector Base Current Gain and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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