Input Resistance of Common-Collector Amplifier Calculator

✖Fundamental component voltage is the first harmonic of the voltage in the harmonic analysis of the square wave of voltage in an inverter based circuit.ⓘ Fundamental Component Voltage [V_fc]			+10% -10%
✖Base Current is a crucial current of bipolar junction transistor. Without the base current, the transistor cannot turn on.ⓘ Base Current [i_b]			+10% -10%

✖Input resistance 2 is the opposition that an electrical component or circuit presents to the flow of electrical current when a voltage is applied to it.ⓘ Input Resistance of Common-Collector Amplifier [R_in]

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Input Resistance of Common-Collector Amplifier

Formula

`"R"_{"in"} = "V"_{"fc"}/"i"_{"b"}`

Example

`"0.307598kΩ"="5V"/"16.255mA"`

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Input Resistance of Common-Collector Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Resistance = Fundamental Component Voltage/Base Current
R_in = V_fc/i_b
This formula uses 3 Variables

Variables Used

Input Resistance - (Measured in Ohm) - Input resistance 2 is the opposition that an electrical component or circuit presents to the flow of electrical current when a voltage is applied to it.
Fundamental Component Voltage - (Measured in Volt) - Fundamental component voltage is the first harmonic of the voltage in the harmonic analysis of the square wave of voltage in an inverter based circuit.
Base Current - (Measured in Ampere) - Base Current is a crucial current of bipolar junction transistor. Without the base current, the transistor cannot turn on.

STEP 1: Convert Input(s) to Base Unit

Fundamental Component Voltage: 5 Volt --> 5 Volt No Conversion Required
Base Current: 16.255 Milliampere --> 0.016255 Ampere (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_in = V_fc/i_b --> 5/0.016255

Evaluating ... ...

R_in = 307.597662257767

STEP 3: Convert Result to Output's Unit

307.597662257767 Ohm -->0.307597662257767 Kilohm (Check conversion here)

FINAL ANSWER

0.307597662257767 ≈ 0.307598 Kilohm <-- Input Resistance

(Calculation completed in 00.004 seconds)

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< 18 Transistor Amplifier Characteristics Calculators

Current Flowing through Induced Channel in Transistor given Oxide Voltage

Go Output Current = (Mobility of Electron*Oxide Capacitance*(Width of Channel/Length of Channel)*(Voltage across Oxide-Threshold Voltage))*Saturation Voltage between Drain and Source

Overall Effective Voltage of MOSFET Transconductance

Go Effective Voltage = sqrt(2*Saturation Drain Current/(Process Transconductance Parameter*(Width of Channel/Length of Channel)))

Current Entering Drain Terminal of MOSFET at Saturation

Go Saturation Drain Current = 1/2*Process Transconductance Parameter*(Width of Channel/Length of Channel)*(Effective Voltage)^2

Input Voltage given Signal Voltage

Go Fundamental Component Voltage = (Finite Input Resistance/(Finite Input Resistance+Signal Resistance))*Small Signal Voltage

Transconductance Parameter of MOS Transistor

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

Instantaneous Drain Current using Voltage between Drain and Source

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

Drain Current of Transistor

Go Drain Current = (Fundamental Component Voltage+Total Instantaneous Drain Voltage)/Drain Resistance

Total Instantaneous Drain Voltage

Go Total Instantaneous Drain Voltage = Fundamental Component Voltage-Drain Resistance*Drain Current

Input Voltage in Transistor

Go Fundamental Component Voltage = Drain Resistance*Drain Current-Total Instantaneous Drain Voltage

Transconductance of Transistor Amplifiers

Go MOSFET Primary Transconductance = (2*Drain Current)/(Voltage across Oxide-Threshold Voltage)

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

Input Resistance of Common-Collector Amplifier

Go Input Resistance = Fundamental Component Voltage/Base Current

Output Resistance of Common Gate Circuit given Test-Voltage

Go Finite Output Resistance = Test Voltage/Test Current

Amplifier Input of Transistor Amplifier

Go Amplifier Input = Input Resistance*Input Current

DC Current Gain of Amplifier

Go DC Current Gain = Collector Current/Base Current

Input Resistance of Common-Gate Circuit

Go Input Resistance = Test Voltage/Test Current

Test Current of Transistor Amplifier

Go Test Current = Test Voltage/Input Resistance

< 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 Resistance of Common-Collector Amplifier Formula

Input Resistance = Fundamental Component Voltage/Base Current
R_in = V_fc/i_b

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 Common-Collector Amplifier?

Input Resistance of Common-Collector Amplifier calculator uses Input Resistance = Fundamental Component Voltage/Base Current to calculate the Input Resistance, The input resistance of common-collector amplifier formula is defined as resistance seen by current source or voltage source which drives circuit. Input Resistance is denoted by R_in symbol.

How to calculate Input Resistance of Common-Collector Amplifier using this online calculator? To use this online calculator for Input Resistance of Common-Collector Amplifier, enter Fundamental Component Voltage (V_fc) & Base Current (i_b) and hit the calculate button. Here is how the Input Resistance of Common-Collector Amplifier calculation can be explained with given input values -> 0.000308 = 5/0.016255.

FAQ

What is Input Resistance of Common-Collector Amplifier?

The input resistance of common-collector amplifier formula is defined as resistance seen by current source or voltage source which drives circuit and is represented as R_in = V_fc/i_b or Input Resistance = Fundamental Component Voltage/Base Current. Fundamental component voltage is the first harmonic of the voltage in the harmonic analysis of the square wave of voltage in an inverter based circuit & Base Current is a crucial current of bipolar junction transistor. Without the base current, the transistor cannot turn on.

How to calculate Input Resistance of Common-Collector Amplifier?

The input resistance of common-collector amplifier formula is defined as resistance seen by current source or voltage source which drives circuit is calculated using Input Resistance = Fundamental Component Voltage/Base Current. To calculate Input Resistance of Common-Collector Amplifier, you need Fundamental Component Voltage (V_fc) & Base Current (i_b). With our tool, you need to enter the respective value for Fundamental Component Voltage & Base Current 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 Fundamental Component Voltage & Base Current. We can use 5 other way(s) to calculate the same, which is/are as follows -

Input Resistance = Test Voltage/Test Current
Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/Small Signal Input Resistance)^-1
Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/(Small Signal Input Resistance+(Collector Base Current Gain+1)*Emitter Resistance))^-1
Input Resistance = (Emitter Resistance*(Finite Output Resistance+Load Resistance))/(Finite Output Resistance+(Load Resistance/(Collector Base Current Gain+1)))
Input Resistance = (1/Base Resistance+1/Base Resistance 2+1/((Total Resistance+Emitter Resistance)*(Collector Base Current Gain+1)))^-1

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