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Input resistance of the base of the emitter-follower Solution

STEP 0: Pre-Calculation Summary
Formula Used
change_in_base_current = (Common emitter current gain+1)*(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance))
ib = (β+1)*(re+(1/R+1/Ro+1/Rl))
This formula uses 5 Variables
Variables Used
Common emitter current gain- Common emitter current gain is highly influenced by two factors: the width of the base region, W, and the relative dopings of the base region and the emitter region.
Emitter Resistance - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor. (Measured in Ohm)
Total resistance in the emitter - The total resistance in the emitter is the total opposition caused in the flow of current in the emitter (Measured in Ohm)
Output resistance - Output resistance is the value of resistance of the network (Measured in Ohm)
Load resistance - Load resistance is the resistance value of load given for the network (Measured in Kilohm)
STEP 1: Convert Input(s) to Base Unit
Common emitter current gain: 55 --> No Conversion Required
Emitter Resistance: 50 Ohm --> 50 Ohm No Conversion Required
Total resistance in the emitter: 40 Ohm --> 40 Ohm No Conversion Required
Output resistance: 200 Ohm --> 200 Ohm No Conversion Required
Load resistance: 1 Kilohm --> 1000 Ohm (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
ib = (β+1)*(re+(1/R+1/Ro+1/Rl)) --> (55+1)*(50+(1/40+1/200+1/1000))
Evaluating ... ...
ib = 2801.736
STEP 3: Convert Result to Output's Unit
2801.736 Ampere --> No Conversion Required
FINAL ANSWER
2801.736 Ampere <-- Change in base current
(Calculation completed in 00.016 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 base of the emitter-follower Formula

change_in_base_current = (Common emitter current gain+1)*(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance))
ib = (β+1)*(re+(1/R+1/Ro+1/Rl))

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 Input resistance of the base of the emitter-follower?

Input resistance of the base of the emitter-follower calculator uses change_in_base_current = (Common emitter current gain+1)*(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance)) to calculate the Change in base current, The input resistance of the base of the emitter-follower formula is defined as the opposition offered to the flow of current in the base region of the electrical circuit. Change in base current and is denoted by ib symbol.

How to calculate Input resistance of the base of the emitter-follower using this online calculator? To use this online calculator for Input resistance of the base of the emitter-follower, enter Common emitter current gain (β), Emitter Resistance (re), Total resistance in the emitter (R), Output resistance (Ro) and Load resistance (Rl) and hit the calculate button. Here is how the Input resistance of the base of the emitter-follower calculation can be explained with given input values -> 2801.736 = (55+1)*(50+(1/40+1/200+1/1000)).

FAQ

What is Input resistance of the base of the emitter-follower?
The input resistance of the base 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 ib = (β+1)*(re+(1/R+1/Ro+1/Rl)) or change_in_base_current = (Common emitter current gain+1)*(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance)). Common emitter current gain is highly influenced by two factors: the width of the base region, W, and the relative dopings of the base region and the emitter region, Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor, The total resistance in the emitter is the total opposition caused in the flow of current in the emitter, Output resistance is the value of resistance of the network and Load resistance is the resistance value of load given for the network.
How to calculate Input resistance of the base of the emitter-follower?
The input resistance of the base 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 change_in_base_current = (Common emitter current gain+1)*(Emitter Resistance+(1/Total resistance in the emitter+1/Output resistance+1/Load resistance)). To calculate Input resistance of the base of the emitter-follower, you need Common emitter current gain (β), Emitter Resistance (re), Total resistance in the emitter (R), Output resistance (Ro) and Load resistance (Rl). With our tool, you need to enter the respective value for Common emitter current gain, Emitter Resistance, Total resistance in the emitter, Output resistance and Load resistance 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 Change in base current?
In this formula, Change in base current uses Common emitter current gain, Emitter Resistance, Total resistance in the emitter, Output resistance and Load resistance. 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 base of the emitter-follower calculator used?
Among many, Input resistance of the base of the emitter-follower calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
{FormulaExamplesList}
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