Input Resistance of BJT Calculator

✖Input voltage is the voltage supplied to the device.ⓘ Input Voltage [V_in]			+10% -10%
✖Signal current is the current in the amplified output current of a transistor.ⓘ Signal Current [i_si]			+10% -10%

✖Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.ⓘ Input Resistance of BJT [R_in]

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Formula

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Input Resistance of BJT

Formula

`"R"_{"in"} = "V"_{"in"}/"i"_{"si"}`

Example

`"0.943396kΩ"="2.50V"/"2.65mA"`

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Input Resistance of BJT Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Resistance = Input Voltage/Signal Current
R_in = V_in/i_si
This formula uses 3 Variables

Variables Used

Input Resistance - (Measured in Ohm) - Input Resistance is the resistance seen by the current source or voltage source which drives the circuit.
Input Voltage - (Measured in Volt) - Input voltage is the voltage supplied to the device.
Signal Current - (Measured in Ampere) - Signal current is the current in the amplified output current of a transistor.

STEP 1: Convert Input(s) to Base Unit

Input Voltage: 2.5 Volt --> 2.5 Volt No Conversion Required
Signal Current: 2.65 Milliampere --> 0.00265 Ampere (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_in = V_in/i_si --> 2.5/0.00265

Evaluating ... ...

R_in = 943.396226415094

STEP 3: Convert Result to Output's Unit

943.396226415094 Ohm -->0.943396226415094 Kilohm (Check conversion here)

FINAL ANSWER

0.943396226415094 ≈ 0.943396 Kilohm <-- Input Resistance

(Calculation completed in 00.004 seconds)

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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National Institute Of Technology (NIT), Hamirpur

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Go Resistance = (Supply Voltage+Collector-Emitter Voltage)/Collector Current

Small-Signal Input Resistance between Base and Emitter using Transconductance

Go Signal Resistance = Common Emitter Current Gain/Transconductance

Output Resistance of Transistor when Base Current is Constant

Go Resistance = -(Collector-Emitter Voltage/Collector Current)

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Go Emitter Resistance = Threshold Voltage/Emitter Current

Emitter Resistance given Emitter Current

Go Emitter Resistance = Threshold Voltage/Emitter Current

Output Resistance of Simple Current BJT given Early Voltage

Go Output Resistance = Supply Voltage/Reference Current

Small-Signal Input Resistance between Base and Emitter using Base Current

Go Signal Resistance = Threshold Voltage/Base Current

Output Resistance of Current Source given Device Parameter

Go Output Resistance = Device Parameter/Drain Current

Output Resistance of Simple Current BJT

Go Output Resistance = Supply Voltage/Output Current

Small-Signal Input Resistance given Emitter Current

Go Small Signal = Signal Current*Emitter Resistance

Emitter Resistance of BJT

Go Emitter Resistance = Small Signal/Signal Current

Input Resistance of BJT

Go Input Resistance = Input Voltage/Signal Current

Small-Signal Input Resistance between Base and Emitter

Go Signal Resistance = Input Voltage/Base Current

Input Resistance of BJT Formula

Input Resistance = Input Voltage/Signal Current
R_in = V_in/i_si

What affects the input resistance of CE amplifier?

When an emitter resistance is added in a CE (Common Emitter) amplifier, its voltage gain is reduced, but the input impedance increases. Whenever the bypass capacitor is connected in parallel with an emitter resistance, the voltage gain of the CE amplifier increases.

How to Calculate Input Resistance of BJT?

Input Resistance of BJT calculator uses Input Resistance = Input Voltage/Signal Current to calculate the Input Resistance, The Input resistance of BJT in terms of emitter resistance formula is defined as the resistance seen by the current source or voltage source which drives the circuit. Input Resistance is denoted by R_in symbol.

How to calculate Input Resistance of BJT using this online calculator? To use this online calculator for Input Resistance of BJT, enter Input Voltage (V_in) & Signal Current (i_si) and hit the calculate button. Here is how the Input Resistance of BJT calculation can be explained with given input values -> 0.000943 = 2.5/0.00265.

FAQ

What is Input Resistance of BJT?

The Input resistance of BJT in terms of emitter resistance formula is defined as the resistance seen by the current source or voltage source which drives the circuit and is represented as R_in = V_in/i_si or Input Resistance = Input Voltage/Signal Current. Input voltage is the voltage supplied to the device & Signal current is the current in the amplified output current of a transistor.

How to calculate Input Resistance of BJT?

The Input resistance of BJT in terms of emitter resistance formula is defined as the resistance seen by the current source or voltage source which drives the circuit is calculated using Input Resistance = Input Voltage/Signal Current. To calculate Input Resistance of BJT, you need Input Voltage (V_in) & Signal Current (i_si). With our tool, you need to enter the respective value for Input Voltage & Signal 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 Input Voltage & Signal Current. We can use 1 other way(s) to calculate the same, which is/are as follows -

Input Resistance = (1/Transconductance)+(Load Resistance/(Transconductance*Finite Output Resistance))

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