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## Credits

Birsa Institute of Technology (BIT), Sindri
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## Input resistance of the emitter-follower Solution

STEP 0: Pre-Calculation Summary
Formula Used
resistance_input = 1/Signal current in the base+1/Base Current
Ri = 1/ib+1/IB
This formula uses 2 Variables
Variables Used
Signal current in the base - Signal current in the base is the current flowing through the base at any moment. (Measured in Ampere)
Base Current - Base Current is a crucial current of bipolar junction transistor. Without the base current, the transistor cannot turn on. (Measured in Ampere)
STEP 1: Convert Input(s) to Base Unit
Signal current in the base: 25 Ampere --> 25 Ampere No Conversion Required
Base Current: 50 Ampere --> 50 Ampere No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Ri = 1/ib+1/IB --> 1/25+1/50
Evaluating ... ...
Ri = 0.06
STEP 3: Convert Result to Output's Unit
0.06 Ohm --> No Conversion Required
FINAL ANSWER
0.06 Ohm <-- Input resistance
(Calculation completed in 00.006 seconds)

## < 6 An Emitter Follower Calculators

Output voltage of the emitter-follower
output_voltage = Input voltage*((1/Total resistance in the emitter+1/Output resistance+1/Load resistance)/(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance))) Go
Output resistance of the emitter-follower
output_resistance_of_transistor = (1/Output resistance+1/Small-signal voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Common emitter current gain+1) Go
Input resistance of the base of the emitter-follower
change_in_base_current = (Common emitter current gain+1)*(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance)) Go
Input voltage of the emitter-follower
input_voltage = Small-signal voltage*(Input resistance/(Input resistance+Signal Resistance)) Go
Input resistance of the emitter-follower
resistance_input = 1/Signal current in the base+1/Base Current Go
Overall voltage gain of the emitter-follower
overall_voltage_gain = Output voltage/Small-signal voltage Go

### Input resistance of the emitter-follower Formula

resistance_input = 1/Signal current in the base+1/Base Current
Ri = 1/ib+1/IB

## 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 a low output impedance.

## How to Calculate Input resistance of the emitter-follower?

Input resistance of the emitter-follower calculator uses resistance_input = 1/Signal current in the base+1/Base Current to calculate the Input resistance, The input resistance of the emitter-follower formula is defined as the opposition offered to the flow of current in the base region of the electrical circuit. Input resistance and is denoted by Ri symbol.

How to calculate Input resistance of the emitter-follower using this online calculator? To use this online calculator for Input resistance of the emitter-follower, enter Signal current in the base (ib) and Base Current (IB) and hit the calculate button. Here is how the Input resistance of the emitter-follower calculation can be explained with given input values -> 0.06 = 1/25+1/50.

### FAQ

What is Input resistance of the emitter-follower?
The input resistance of the emitter-follower formula is defined as the opposition offered to the flow of current in the base region of the electrical circuit and is represented as Ri = 1/ib+1/IB or resistance_input = 1/Signal current in the base+1/Base Current. Signal current in the base is the current flowing through the base at any moment and Base Current is a crucial current of bipolar junction transistor. Without the base current, the transistor cannot turn on.
How to calculate Input resistance of the emitter-follower?
The input resistance of the emitter-follower formula is defined as the opposition offered to the flow of current in the base region of the electrical circuit is calculated using resistance_input = 1/Signal current in the base+1/Base Current. To calculate Input resistance of the emitter-follower, you need Signal current in the base (ib) and Base Current (IB). With our tool, you need to enter the respective value for Signal current in the base and Base Current 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 Signal current in the base and Base Current. We can use 6 other way(s) to calculate the same, which is/are as follows -
• resistance_input = 1/Signal current in the base+1/Base Current
• change_in_base_current = (Common emitter current gain+1)*(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance))
• input_voltage = Small-signal voltage*(Input resistance/(Input resistance+Signal Resistance))
• output_voltage = Input voltage*((1/Total resistance in the emitter+1/Output resistance+1/Load resistance)/(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance)))
• overall_voltage_gain = Output voltage/Small-signal voltage
• output_resistance_of_transistor = (1/Output resistance+1/Small-signal voltage+1/Emitter Resistance)+(1/Base Impedance+1/Signal Resistance)/(Common emitter current gain+1)
Where is the Input resistance of the emitter-follower calculator used?
Among many, Input resistance of the emitter-follower calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
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