Input Impedance of Common-Base Amplifier Calculator

✖Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.ⓘ Emitter Resistance [R_e]			+10% -10%
✖Small signal input resistance 2 between Base and emitter models how the input impedance between the base and emitter terminals of the transistor changes when a small AC signal is applied.ⓘ Small Signal Input Resistance [R_sm]			+10% -10%

✖Input Impedance is a measure of how much resistance an electronic device has to the flow of current in its input circuitry.ⓘ Input Impedance of Common-Base Amplifier [Z_in]

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Formula

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Input Impedance of Common-Base Amplifier

Formula

`"Z"_{"in"} = (1/"R"_{"e"}+1/"R"_{"sm"})^(-1)`

Example

`"0.064041kΩ"=(1/"0.067kΩ"+1/"1.45kΩ")^(-1)`

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Input Impedance of Common-Base Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1)
Z_in = (1/R_e+1/R_sm)^(-1)
This formula uses 3 Variables

Variables Used

Input Impedance - (Measured in Ohm) - Input Impedance is a measure of how much resistance an electronic device has to the flow of current in its input circuitry.
Emitter Resistance - (Measured in Ohm) - Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor.
Small Signal Input Resistance - (Measured in Ohm) - Small signal input resistance 2 between Base and emitter models how the input impedance between the base and emitter terminals of the transistor changes when a small AC signal is applied.

STEP 1: Convert Input(s) to Base Unit

Emitter Resistance: 0.067 Kilohm --> 67 Ohm (Check conversion here)
Small Signal Input Resistance: 1.45 Kilohm --> 1450 Ohm (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Z_in = (1/R_e+1/R_sm)^(-1) --> (1/67+1/1450)^(-1)

Evaluating ... ...

Z_in = 64.0408701384311

STEP 3: Convert Result to Output's Unit

64.0408701384311 Ohm -->0.0640408701384311 Kilohm (Check conversion here)

FINAL ANSWER

0.0640408701384311 ≈ 0.064041 Kilohm <-- Input Impedance

(Calculation completed in 00.020 seconds)

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

Payal Priya has created this Calculator and 600+ more calculators!

Verified by Urvi Rathod

Vishwakarma Government Engineering College (VGEC), Ahmedabad

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< 8 Common-Base Amplifier Calculators

Input Resistance of Common-Base Circuit

Go Input Resistance = (Emitter Resistance*(Finite Output Resistance+Load Resistance))/(Finite Output Resistance+(Load Resistance/(Collector Base Current Gain+1)))

Total Current Gain with respect to Voltage Gain

Go Common Base Current Gain = Overall Voltage Gain/(Collector Resistance/Emitter Resistance*(Input Resistance/(Input Resistance+Signal Resistance)))

Negative Voltage Gain from Base to Collector

Go Negative Voltage Gain = -Common Base Current Gain*(Collector Resistance/Emitter Resistance)

Common Base Current Gain

Go Common Base Current Gain = (Voltage Gain*Emitter Resistance/Collector Resistance)

Input Impedance of Common-Base Amplifier

Go Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1)

Resistance of Emitter in Common-Base Amplifier

Go Emitter Resistance = Input Voltage/Emitter Current

Emitter Current of Common-Base Amplifier

Go Emitter Current = Input Voltage/Emitter Resistance

Voltage Gain of Common-Base Amplifier

Go Voltage Gain = Collector Voltage/Emitter Voltage

< 18 CV Actions of Common Stage Amplifiers Calculators

Output Voltage of Controlled Source Transistor

Go DC Component of Gate to Source Voltage = (Voltage Gain*Electric Current-Short Circuit Transconductance*Differential Output Signal)*(1/Final Resistance+1/Resistance of Primary Winding in Secondary)

Input Resistance of Common-Base Circuit

Go Input Resistance = (Emitter Resistance*(Finite Output Resistance+Load Resistance))/(Finite Output Resistance+(Load Resistance/(Collector Base Current Gain+1)))

Output Resistance at Another Drain of Controlled Source Transistor

Go Drain Resistance = Resistance of Secondary Winding in Primary+2*Finite Resistance+2*Finite Resistance*MOSFET Primary Transconductance*Resistance of Secondary Winding in Primary

Output Resistance of Emitter-Degenerated CE Amplifier

Go Drain Resistance = Finite Output Resistance+(MOSFET Primary Transconductance*Finite Output Resistance)*(1/Emitter Resistance+1/Small Signal Input Resistance)

Input Resistance of Common Emitter Amplifier given Small-Signal Input Resistance

Go Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/(Small Signal Input Resistance+(Collector Base Current Gain+1)*Emitter Resistance))^-1

Output Resistance of CS Amplifier with Source Resistance

Go Drain Resistance = Finite Output Resistance+Source Resistance+(MOSFET Primary Transconductance*Finite Output Resistance*Source Resistance)

Input Resistance of Common-Emitter Amplifier given Emitter Resistance

Go Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/((Total Resistance+Emitter Resistance)*(Collector Base Current Gain+1)))^-1

Instantaneous Drain Current using Voltage between Drain and Source

Go Drain Current = Transconductance Parameter*(Voltage across Oxide-Threshold Voltage)*Voltage between Gate and Source

Transconductance in Common Source Amplifier

Go MOSFET Primary Transconductance = Unity Gain Frequency*(Gate to Source Capacitance+Capacitance Gate to Drain)

Input Resistance of Common Emitter Amplifier

Go Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1

Input Impedance of Common-Base Amplifier

Go Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1)

Signal Current in Emitter given Input Signal

Go Signal Current in Emitter = Fundamental Component Voltage/Emitter Resistance

Transconductance using Collector Current of Transistor Amplifier

Go MOSFET Primary Transconductance = Collector Current/Threshold Voltage

Fundamental Voltage in Common-Emitter Amplifier

Go Fundamental Component Voltage = Input Resistance*Base Current

Input Resistance of Common-Collector Amplifier

Go Input Resistance = Fundamental Component Voltage/Base Current

Resistance of Emitter in Common-Base Amplifier

Go Emitter Resistance = Input Voltage/Emitter Current

Emitter Current of Common-Base Amplifier

Go Emitter Current = Input Voltage/Emitter Resistance

Load Voltage of CS Amplifier

Go Load Voltage = Voltage Gain*Input Voltage

Input Impedance of Common-Base Amplifier Formula

Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1)
Z_in = (1/R_e+1/R_sm)^(-1)

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 Impedance of Common-Base Amplifier?

Input Impedance of Common-Base Amplifier calculator uses Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1) to calculate the Input Impedance, Input Impedance of Common-Base Amplifier is a measure of how much resistance an electronic device has to the flow of current in its input circuitry. It is typically measured in ohms (Ω) and is important to ensure that the signal being input into a device is not degraded due to excessive resistance. Input Impedance is denoted by Z_in symbol.

How to calculate Input Impedance of Common-Base Amplifier using this online calculator? To use this online calculator for Input Impedance of Common-Base Amplifier, enter Emitter Resistance (R_e) & Small Signal Input Resistance (R_sm) and hit the calculate button. Here is how the Input Impedance of Common-Base Amplifier calculation can be explained with given input values -> 6.4E-5 = (1/67+1/1450)^(-1).

FAQ

What is Input Impedance of Common-Base Amplifier?

Input Impedance of Common-Base Amplifier is a measure of how much resistance an electronic device has to the flow of current in its input circuitry. It is typically measured in ohms (Ω) and is important to ensure that the signal being input into a device is not degraded due to excessive resistance and is represented as Z_in = (1/R_e+1/R_sm)^(-1) or Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1). Emitter Resistance is a dynamic resistance of the emitter-base junction diode of a transistor & Small signal input resistance 2 between Base and emitter models how the input impedance between the base and emitter terminals of the transistor changes when a small AC signal is applied.

How to calculate Input Impedance of Common-Base Amplifier?

Input Impedance of Common-Base Amplifier is a measure of how much resistance an electronic device has to the flow of current in its input circuitry. It is typically measured in ohms (Ω) and is important to ensure that the signal being input into a device is not degraded due to excessive resistance is calculated using Input Impedance = (1/Emitter Resistance+1/Small Signal Input Resistance)^(-1). To calculate Input Impedance of Common-Base Amplifier, you need Emitter Resistance (R_e) & Small Signal Input Resistance (R_sm). With our tool, you need to enter the respective value for Emitter Resistance & Small Signal Input Resistance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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