Total Emitter Resistance of Emitter Follower Solution

STEP 0: Pre-Calculation Summary
Formula Used
Emitter Resistance = Base Resistance/High Frequency Constant
Re = Rb/hfc
This formula uses 3 Variables
Variables Used
Emitter Resistance - (Measured in Ohm) - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.
Base Resistance - (Measured in Ohm) - Base resistance is a measure of the opposition to current flow in an electrical circuit.
High Frequency Constant - High Frequency Constant refers to a fixed resistance value that is used to define the input impedance of the amplifier.
STEP 1: Convert Input(s) to Base Unit
Base Resistance: 1.213 Kilohm --> 1213 Ohm (Check conversion here)
High Frequency Constant: 16.89 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Re = Rb/hfc --> 1213/16.89
Evaluating ... ...
Re = 71.8176435760805
STEP 3: Convert Result to Output's Unit
71.8176435760805 Ohm -->0.0718176435760805 Kilohm (Check conversion here)
FINAL ANSWER
0.0718176435760805 0.071818 Kilohm <-- Emitter Resistance
(Calculation completed in 00.004 seconds)

Credits

Created by Payal Priya
Birsa Institute of Technology (BIT), Sindri
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Vishwakarma Government Engineering College (VGEC), Ahmedabad
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10+ Emitter Follower Calculators

Output Resistance of Emitter Follower
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
Go Collector Current = Saturation Current*e^(Voltage across Base Emitter Junction/Threshold Voltage)
Saturation Current of Emitter Follower
Go Saturation Current = Collector Current/e^(Voltage across Base Emitter Junction/Threshold Voltage)
Input Resistance of Emitter Follower
Go Input Resistance = 1/(1/Signal Resistance in Base+1/Base Resistance)
Base Resistance across Emitter follower Junction
Go Base Resistance = High Frequency Constant*Emitter Resistance
Total Emitter Resistance of Emitter Follower
Go Emitter Resistance = Base Resistance/High Frequency Constant
Output Resistance of Transistor at Intrinsic Gain
Go Finite Output Resistance = Early Voltage/Collector Current
Collector Current of Emitter Follower Transistor
Go Collector Current = Early Voltage/Finite Output Resistance
Input Resistance of Transistor Amplifier
Go Input Resistance = Amplifier Input/Input Current
Input Voltage of Emitter Follower
Go Emitter Voltage = Base Voltage-0.7

15 Multi Stage Transistor Amplifiers Calculators

Open Circuit Bipolar Cascode Voltage Gain
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
Output Resistance of Emitter Follower
Go Finite Resistance = (1/Load Resistance+1/Small Signal Voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Collector Base Current Gain+1)
Drain Resistance of Cascode Amplifier
Go Drain Resistance = (Output Voltage Gain/(MOSFET Primary Transconductance^2*Finite Output Resistance))
Output voltage gain of MOS Cascode Amplifier
Go Output Voltage Gain = -MOSFET Primary Transconductance^2*Finite Output Resistance*Drain Resistance
Collector Current in Active Region when Transistor Acts as Amplifier
Go Collector Current = Saturation Current*e^(Voltage across Base Emitter Junction/Threshold Voltage)
Saturation Current of Emitter Follower
Go Saturation Current = Collector Current/e^(Voltage across Base Emitter Junction/Threshold Voltage)
Equivalent Resistance of Cascode Amplifier
Go Resistance between Drain and Ground = (1/Finite Output Resistance of Transistor 1+1/Input Resistance)^-1
Negative Voltage Gain of Cascode Amplifier
Go Negative Voltage Gain = -(MOSFET Primary Transconductance*Resistance between Drain and Ground)
Input Resistance of Emitter Follower
Go Input Resistance = 1/(1/Signal Resistance in Base+1/Base Resistance)
Base Resistance across Emitter follower Junction
Go Base Resistance = High Frequency Constant*Emitter Resistance
Total Emitter Resistance of Emitter Follower
Go Emitter Resistance = Base Resistance/High Frequency Constant
Output Resistance of Transistor at Intrinsic Gain
Go Finite Output Resistance = Early Voltage/Collector Current
Collector Current of Emitter Follower Transistor
Go Collector Current = Early Voltage/Finite Output Resistance
Input Resistance of Transistor Amplifier
Go Input Resistance = Amplifier Input/Input Current
Input Voltage of Emitter Follower
Go Emitter Voltage = Base Voltage-0.7

Total Emitter Resistance of Emitter Follower Formula

Emitter Resistance = Base Resistance/High Frequency Constant
Re = Rb/hfc

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 Total Emitter Resistance of Emitter Follower?

Total Emitter Resistance of Emitter Follower calculator uses Emitter Resistance = Base Resistance/High Frequency Constant to calculate the Emitter Resistance, Total Emitter Resistance of Emitter Follower refers to the opposition to current flow in an active device, such as a transistor, when it is in the emitter region. Emitter Resistance is denoted by Re symbol.

How to calculate Total Emitter Resistance of Emitter Follower using this online calculator? To use this online calculator for Total Emitter Resistance of Emitter Follower, enter Base Resistance (Rb) & High Frequency Constant (hfc) and hit the calculate button. Here is how the Total Emitter Resistance of Emitter Follower calculation can be explained with given input values -> 7.2E-5 = 1213/16.89.

FAQ

What is Total Emitter Resistance of Emitter Follower?
Total Emitter Resistance of Emitter Follower refers to the opposition to current flow in an active device, such as a transistor, when it is in the emitter region and is represented as Re = Rb/hfc or Emitter Resistance = Base Resistance/High Frequency Constant. Base resistance is a measure of the opposition to current flow in an electrical circuit & High Frequency Constant refers to a fixed resistance value that is used to define the input impedance of the amplifier.
How to calculate Total Emitter Resistance of Emitter Follower?
Total Emitter Resistance of Emitter Follower refers to the opposition to current flow in an active device, such as a transistor, when it is in the emitter region is calculated using Emitter Resistance = Base Resistance/High Frequency Constant. To calculate Total Emitter Resistance of Emitter Follower, you need Base Resistance (Rb) & High Frequency Constant (hfc). With our tool, you need to enter the respective value for Base Resistance & High Frequency Constant 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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