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Output resistance of the emitter-follower Solution

STEP 0: Pre-Calculation Summary
Formula Used
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)
ro = (1/Ro+1/vπ +1/re)+(1/Zbase+1/Rs)/(β+1)
This formula uses 6 Variables
Variables Used
Output resistance - Output resistance is the value of resistance of the network (Measured in Ohm)
Small-signal voltage - The small-signal voltage is a quantitative expression of the potential difference in electrical charge between two points in an electrical field. (Measured in Volt)
Emitter Resistance - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor. (Measured in Ohm)
Base Impedance - Base Impedance is the ratio of the base voltage to the base current. It is denoted as Zbase . (Measured in Ohm)
Signal Resistance- Signal Resistance is the resistance which is fed with the signal voltage source vs to an Amplifier
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.
STEP 1: Convert Input(s) to Base Unit
Output resistance: 200 Ohm --> 200 Ohm No Conversion Required
Small-signal voltage: 75 Volt --> 75 Volt No Conversion Required
Emitter Resistance: 50 Ohm --> 50 Ohm No Conversion Required
Base Impedance: 10 Ohm --> 10 Ohm No Conversion Required
Signal Resistance: 1 --> No Conversion Required
Common emitter current gain: 55 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
ro = (1/Ro+1/vπ +1/re)+(1/Zbase+1/Rs)/(β+1) --> (1/200+1/75+1/50)+(1/10+1/1)/(55+1)
Evaluating ... ...
ro = 0.0579761904761905
STEP 3: Convert Result to Output's Unit
0.0579761904761905 Ohm --> No Conversion Required
FINAL ANSWER
0.0579761904761905 Ohm <-- Output resistance of transistor
(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

Output resistance of the emitter-follower Formula

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)
ro = (1/Ro+1/vπ +1/re)+(1/Zbase+1/Rs)/(β+1)

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 the emitter-follower?

Output resistance of the emitter-follower calculator uses 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) to calculate the Output resistance of transistor, The output resistance of the emitter-follower formula is defined as simply the parallel combination of the Emitter (Source) resistor RL and the small-signal emitter (source) resistance of the transistor rE. Output resistance of transistor and is denoted by ro symbol.

How to calculate Output resistance of the emitter-follower using this online calculator? To use this online calculator for Output resistance of the emitter-follower, enter Output resistance (Ro), Small-signal voltage (vπ ), Emitter Resistance (re), Base Impedance (Zbase), Signal Resistance (Rs) and Common emitter current gain (β) and hit the calculate button. Here is how the Output resistance of the emitter-follower calculation can be explained with given input values -> 0.057976 = (1/200+1/75+1/50)+(1/10+1/1)/(55+1).

FAQ

What is Output resistance of the emitter-follower?
The output resistance of the emitter-follower formula is defined as simply the parallel combination of the Emitter (Source) resistor RL and the small-signal emitter (source) resistance of the transistor rE and is represented as ro = (1/Ro+1/vπ +1/re)+(1/Zbase+1/Rs)/(β+1) or 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). Output resistance is the value of resistance of 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 vs to an Amplifier and 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.
How to calculate Output resistance of the emitter-follower?
The output resistance of the emitter-follower formula is defined as simply the parallel combination of the Emitter (Source) resistor RL and the small-signal emitter (source) resistance of the transistor rE is calculated using 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). To calculate Output resistance of the emitter-follower, you need Output resistance (Ro), Small-signal voltage (vπ ), Emitter Resistance (re), Base Impedance (Zbase), Signal Resistance (Rs) and Common emitter current gain (β). With our tool, you need to enter the respective value for Output resistance, Small-signal voltage, Emitter Resistance, Base Impedance, Signal Resistance and Common emitter current gain 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 Output resistance of transistor?
In this formula, Output resistance of transistor uses Output resistance, Small-signal voltage, Emitter Resistance, Base Impedance, Signal Resistance and Common emitter current gain. 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 Output resistance of the emitter-follower calculator used?
Among many, Output resistance 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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