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Input resistance of the common-base amplifier Solution

STEP 0: Pre-Calculation Summary
Formula Used
resistance_input = 1/MOSFET Transconductance
Ri = 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
Ri = 1/gm --> 1/2.5E-07
Evaluating ... ...
Ri = 4000000
STEP 3: Convert Result to Output's Unit
4000000 Ohm --> No Conversion Required
FINAL ANSWER
4000000 Ohm <-- Input resistance
(Calculation completed in 00.000 seconds)

7 Common-base amplifier Calculators

Overall voltage gain of the common-base amplifier
overall_voltage_gain = Common emitter current gain*(Input resistance/(Input resistance+Signal Resistance))*((1/Total resistance in collector+1/Load resistance)/Emitter Resistance) Go
Overall voltage gain of the common-base amplifier in terms of transconductance
overall_voltage_gain = (Input resistance/(Input resistance+Signal Resistance))*MOSFET Transconductance*(1/Total resistance in collector+1/Load resistance) Go
Output voltage of the common-base amplifier
output_voltage = -(Common emitter current gain*Emitter current*(1/Load Resistance+1/Load resistance)) Go
Input voltage of the common-base amplifier
input_voltage = Small-signal voltage*(Input resistance/(Input resistance+Signal Resistance)) Go
Input resistance of the common-base amplifier in terms of emitter resistance
resistance_input = (1/Total resistance in the emitter+1/Emitter Resistance) Go
Emitter current of the common-base amplifier
emitter_current = -(Input voltage/Emitter Resistance) Go
Input resistance of the common-base amplifier
resistance_input = 1/MOSFET Transconductance Go

Input resistance of the common-base amplifier Formula

resistance_input = 1/MOSFET Transconductance
Ri = 1/gm

What is the advantage of a common base amplifier?

The common base circuit works best as a current buffer. It can take an input current at a low input impedance, and deliver nearly that same current to a higher impedance output.

How to Calculate Input resistance of the common-base amplifier?

Input resistance of the common-base amplifier calculator uses resistance_input = 1/MOSFET Transconductance to calculate the Input resistance, The input resistance of the common-base amplifier formula is defined as the opposition offered to the flow of current in the base region of the electrical circuit. Input resistance and is denoted by Ri symbol.

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

FAQ

What is Input resistance of the common-base amplifier?
The input resistance of the common-base amplifier formula is defined as the opposition offered to the flow of current in the base region of the electrical circuit and is represented as Ri = 1/gm or resistance_input = 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 Input resistance of the common-base amplifier?
The input resistance of the common-base amplifier formula is defined as the opposition offered to the flow of current in the base region of the electrical circuit is calculated using resistance_input = 1/MOSFET Transconductance. To calculate Input resistance of the common-base 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 Input resistance?
In this formula, Input resistance uses MOSFET Transconductance. We can use 7 other way(s) to calculate the same, which is/are as follows -
  • resistance_input = 1/MOSFET Transconductance
  • input_voltage = Small-signal voltage*(Input resistance/(Input resistance+Signal Resistance))
  • emitter_current = -(Input voltage/Emitter Resistance)
  • resistance_input = (1/Total resistance in the emitter+1/Emitter Resistance)
  • output_voltage = -(Common emitter current gain*Emitter current*(1/Load Resistance+1/Load resistance))
  • overall_voltage_gain = Common emitter current gain*(Input resistance/(Input resistance+Signal Resistance))*((1/Total resistance in collector+1/Load resistance)/Emitter Resistance)
  • overall_voltage_gain = (Input resistance/(Input resistance+Signal Resistance))*MOSFET Transconductance*(1/Total resistance in collector+1/Load resistance)
Where is the Input resistance of the common-base amplifier calculator used?
Among many, Input resistance of the common-base amplifier calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
{FormulaExamplesList}
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