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## Credits

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

STEP 0: Pre-Calculation Summary
Formula Used
resistance_output = 1/MOSFET Transconductance
Ro = 1/gm
This formula uses 1 Variables
Variables Used
MOSFET Transconductance - MOSFET Transconductance is the change in the drain current divided by the small change in the gate/source voltage with a constant drain/source voltage. (Measured in Microsiemens)
STEP 1: Convert Input(s) to Base Unit
MOSFET Transconductance: 0.25 Microsiemens --> 2.5E-07 Siemens (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Ro = 1/gm --> 1/2.5E-07
Evaluating ... ...
Ro = 4000000
STEP 3: Convert Result to Output's Unit
4000000 Ohm --> No Conversion Required
FINAL ANSWER
4000000 Ohm <-- Output 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

### Output resistance of the common-drain amplifier Formula

resistance_output = 1/MOSFET Transconductance
Ro = 1/gm

## What is common drain amplifier?

A common-drain amplifier is one in which the input signal is applied to the gate and the output is taken from the source, making the drain common to both. Because it is common, there is no need for a drain resistor. A common-drain amplifier is shown below. A common-drain amplifier is also called a source-follower.

## How to Calculate Output resistance of the common-drain amplifier?

Output resistance of the common-drain amplifier calculator uses resistance_output = 1/MOSFET Transconductance to calculate the Output resistance, The output resistance of the common-drain amplifier formula is defined as the ratio of the test voltage to drawn current is the output resistance. Output resistance and is denoted by Ro symbol.

How to calculate Output resistance of the common-drain amplifier using this online calculator? To use this online calculator for Output resistance of the common-drain amplifier, enter MOSFET Transconductance (gm) and hit the calculate button. Here is how the Output resistance of the common-drain amplifier calculation can be explained with given input values -> 4.000E+6 = 1/2.5E-07.

### FAQ

What is Output resistance of the common-drain amplifier?
The output resistance of the common-drain amplifier formula is defined as the ratio of the test voltage to drawn current is the output resistance and is represented as Ro = 1/gm or resistance_output = 1/MOSFET Transconductance. MOSFET Transconductance is the change in the drain current divided by the small change in the gate/source voltage with a constant drain/source voltage.
How to calculate Output resistance of the common-drain amplifier?
The output resistance of the common-drain amplifier formula is defined as the ratio of the test voltage to drawn current is the output resistance is calculated using resistance_output = 1/MOSFET Transconductance. To calculate Output resistance of the common-drain amplifier, you need MOSFET Transconductance (gm). With our tool, you need to enter the respective value for MOSFET Transconductance 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 MOSFET Transconductance. 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 common-drain amplifier calculator used?
Among many, Output resistance of the common-drain amplifier calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
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