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## Credits

Birsa Institute of Technology (BIT), Sindri
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## Input resistance of the common-collector amplifier Solution

STEP 0: Pre-Calculation Summary
Formula Used
resistance_input = Input voltage/Signal current in the base
Ri = Vi/ib
This formula uses 2 Variables
Variables Used
Input voltage - Input voltage is the voltage supplied to the device (Measured in Volt)
Signal current in the base - Signal current in the base is the current flowing through the base at any moment. (Measured in Ampere)
STEP 1: Convert Input(s) to Base Unit
Input voltage: 1 Volt --> 1 Volt No Conversion Required
Signal current in the base: 25 Ampere --> 25 Ampere No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Ri = Vi/ib --> 1/25
Evaluating ... ...
Ri = 0.04
STEP 3: Convert Result to Output's Unit
0.04 Ohm --> No Conversion Required
FINAL ANSWER
0.04 Ohm <-- Input resistance
(Calculation completed in 00.016 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

### Input resistance of the common-collector amplifier Formula

resistance_input = Input voltage/Signal current in the base
Ri = Vi/ib

## What is a common collector amplifier called?

In electronics, a common collector amplifier (also known as an emitter follower) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a voltage buffer.

## Why common collector amplifier is called buffer?

The common base configuration has nearly unity current gain. Hence it is not a current amplifier (as it does not provide a current gain in excess of one). Because of this unity current gain, it is termed as a buffer.

## How to Calculate Input resistance of the common-collector amplifier?

Input resistance of the common-collector amplifier calculator uses resistance_input = Input voltage/Signal current in the base to calculate the Input resistance, The input resistance of the common-collector amplifier formula is defined as the resistance seen by the current source or voltage source which drives the circuit. Input resistance and is denoted by Ri symbol.

How to calculate Input resistance of the common-collector amplifier using this online calculator? To use this online calculator for Input resistance of the common-collector amplifier, enter Input voltage (Vi) and Signal current in the base (ib) and hit the calculate button. Here is how the Input resistance of the common-collector amplifier calculation can be explained with given input values -> 0.04 = 1/25.

### FAQ

What is Input resistance of the common-collector amplifier?
The input resistance of the common-collector amplifier formula is defined as the resistance seen by the current source or voltage source which drives the circuit and is represented as Ri = Vi/ib or resistance_input = Input voltage/Signal current in the base. Input voltage is the voltage supplied to the device and Signal current in the base is the current flowing through the base at any moment.
How to calculate Input resistance of the common-collector amplifier?
The input resistance of the common-collector amplifier formula is defined as the resistance seen by the current source or voltage source which drives the circuit is calculated using resistance_input = Input voltage/Signal current in the base. To calculate Input resistance of the common-collector amplifier, you need Input voltage (Vi) and Signal current in the base (ib). With our tool, you need to enter the respective value for Input voltage and Signal current in the base 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 Input voltage and Signal current in the base. 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 Input resistance of the common-collector amplifier calculator used?
Among many, Input resistance of the common-collector amplifier calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
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