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Output resistance of the Emitter-Follower Output Solution

STEP 0: Pre-Calculation Summary
Formula Used
resistance_output = Emitter Resistance+Signal Resistance/(Common emitter current gain+1)
Ro = re+Rs/(β+1)
This formula uses 3 Variables
Variables Used
Emitter Resistance - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor. (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
Emitter Resistance: 50 Ohm --> 50 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 = re+Rs/(β+1) --> 50+1/(55+1)
Evaluating ... ...
Ro = 50.0178571428571
STEP 3: Convert Result to Output's Unit
50.0178571428571 Ohm --> No Conversion Required
FINAL ANSWER
50.0178571428571 Ohm <-- Output resistance
(Calculation completed in 00.000 seconds)

10+ Common-Gate (CG) and the Common-Base (CB) Amplifiers Calculators

Overall voltage gain of the amplifier when load resistance is connected to the output
overall_voltage_gain = Common-base current gain.*(1/Total resistance in the emitter+1/Load resistance)/(Signal Resistance+Emitter Resistance) Go
Overall voltage gain of the amplifier
overall_voltage_gain = (1/Load resistance of MOSFET+1/Load resistance)/(Signal Resistance+1/MOSFET transconductance parameter) Go
Overall voltage gain of the source follower
overall_voltage_gain = Load resistance/(Load resistance+1/MOSFET Transconductance) Go
Output voltage in terms of the transconductance
output_voltage = -(MOSFET Transconductance*Load Resistance*Finite input voltage) Go
Voltage gain of the buffer amplifier
voltage_gain_amplifier = Load resistance/(Load resistance+Emitter Resistance) Go
Voltage gain of the common-drain amplifier
voltage_gain = Input resistance/(Load resistance+1/MOSFET Transconductance) Go
Voltage gain of the CS amplifier
voltage_gain_amplifier = MOSFET Transconductance*Load resistance of MOSFET Go
Input resistance of the common-collector amplifier
resistance_input = Input voltage/Signal current in the base Go
Output resistance of the common-drain amplifier
resistance_output = 1/MOSFET Transconductance Go
Input resistance of the MOSFETs transconductance
resistance_input = 1/MOSFET Transconductance Go

Output resistance of the Emitter-Follower Output Formula

resistance_output = Emitter Resistance+Signal Resistance/(Common emitter current gain+1)
Ro = re+Rs/(β+1)

What is the main function of a common collector amplifier or buffer amplifier?

The common collector or grounded collector configuration is generally used where a high impedance input source needs to be connected to a low impedance output load requiring a high current gain.

How to Calculate Output resistance of the Emitter-Follower Output?

Output resistance of the Emitter-Follower Output calculator uses resistance_output = Emitter Resistance+Signal Resistance/(Common emitter current gain+1) to calculate the Output resistance, The output resistance of the Emitter-Follower Output formula is defined as is the simple parallel combination of the Emitter (Source) resistor RL and the small-signal emitter (source) resistance of the transistor rE. Output resistance and is denoted by Ro symbol.

How to calculate Output resistance of the Emitter-Follower Output using this online calculator? To use this online calculator for Output resistance of the Emitter-Follower Output, enter Emitter Resistance (re), Signal Resistance (Rs) and Common emitter current gain (β) and hit the calculate button. Here is how the Output resistance of the Emitter-Follower Output calculation can be explained with given input values -> 50.01786 = 50+1/(55+1).

FAQ

What is Output resistance of the Emitter-Follower Output?
The output resistance of the Emitter-Follower Output formula is defined as is the simple parallel combination of the Emitter (Source) resistor RL and the small-signal emitter (source) resistance of the transistor rE and is represented as Ro = re+Rs/(β+1) or resistance_output = Emitter Resistance+Signal Resistance/(Common emitter current gain+1). Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor, 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 Output?
The output resistance of the Emitter-Follower Output formula is defined as is the simple parallel combination of the Emitter (Source) resistor RL and the small-signal emitter (source) resistance of the transistor rE is calculated using resistance_output = Emitter Resistance+Signal Resistance/(Common emitter current gain+1). To calculate Output resistance of the Emitter-Follower Output, you need Emitter Resistance (re), Signal Resistance (Rs) and Common emitter current gain (β). With our tool, you need to enter the respective value for Emitter Resistance, 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?
In this formula, Output resistance uses Emitter Resistance, Signal Resistance and Common emitter current gain. We can use 10 other way(s) to calculate the same, which is/are as follows -
  • resistance_input = 1/MOSFET Transconductance
  • voltage_gain_amplifier = MOSFET Transconductance*Load resistance of MOSFET
  • overall_voltage_gain = (1/Load resistance of MOSFET+1/Load resistance)/(Signal Resistance+1/MOSFET transconductance parameter)
  • overall_voltage_gain = Common-base current gain.*(1/Total resistance in the emitter+1/Load resistance)/(Signal Resistance+Emitter Resistance)
  • output_voltage = -(MOSFET Transconductance*Load Resistance*Finite input voltage)
  • voltage_gain = Input resistance/(Load resistance+1/MOSFET Transconductance)
  • resistance_output = 1/MOSFET Transconductance
  • overall_voltage_gain = Load resistance/(Load resistance+1/MOSFET Transconductance)
  • resistance_input = Input voltage/Signal current in the base
  • voltage_gain_amplifier = Load resistance/(Load resistance+Emitter Resistance)
Where is the Output resistance of the Emitter-Follower Output calculator used?
Among many, Output resistance of the Emitter-Follower Output calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
{FormulaExamplesList}
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