Input Bias Current of Differential Amplifier Calculator

✖Current is the rate of flow of charge through a conducting material.ⓘ Current [i]			+10% -10%
✖Common Emitter Current Gain is defined as the ratio of change in output current divided by change in input current.ⓘ Common Emitter Current Gain [β]			+10% -10%

✖Input Bias Current is the average of input current in the operational amplifier.ⓘ Input Bias Current of Differential Amplifier [I_Bias]

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Formula

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Input Bias Current of Differential Amplifier

Formula

`"I"_{"Bias"} = "i"/(2*("β"+1))`

Example

`"5.392157mA"="550mA"/(2*("50"+1))`

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Input Bias Current of Differential Amplifier Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Bias Current = Current/(2*(Common Emitter Current Gain+1))
I_Bias = i/(2*(β+1))
This formula uses 3 Variables

Variables Used

Input Bias Current - (Measured in Ampere) - Input Bias Current is the average of input current in the operational amplifier.
Current - (Measured in Ampere) - Current is the rate of flow of charge through a conducting material.
Common Emitter Current Gain - Common Emitter Current Gain is defined as the ratio of change in output current divided by change in input current.

STEP 1: Convert Input(s) to Base Unit

Current: 550 Milliampere --> 0.55 Ampere (Check conversion here)
Common Emitter Current Gain: 50 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

I_Bias = i/(2*(β+1)) --> 0.55/(2*(50+1))

Evaluating ... ...

I_Bias = 0.0053921568627451

STEP 3: Convert Result to Output's Unit

0.0053921568627451 Ampere -->5.3921568627451 Milliampere (Check conversion here)

FINAL ANSWER

5.3921568627451 ≈ 5.392157 Milliampere <-- Input Bias Current

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics » Amplifiers » BJT Differential Amplifiers » Current and Voltage » Input Bias Current of Differential Amplifier

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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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< 11 Current and Voltage Calculators

First Collector Current of BJT Differential Amplifier

Go First Collector Current = (Common Base Current Gain*Current)/(1+e^((-Differential Input Voltage)/Threshold Voltage))

Second Collector Current of BJT Differential Amplifier

Go Second Collector Current = (Common Base Current Gain*Current)/(1+e^(Differential Input Voltage/Threshold Voltage))

Maximum Input Common-Mode Range Voltage of BJT Differential Amplifier

Go Maximum Common Mode Range = Input Voltage+(Common Base Current Gain*0.5*Current*Collector Resistance)

Emitter Current of BJT Differential Amplifier

Go Emitter Current = Differential Input Voltage/(2*Base Emitter Resistance+2*Collector Emitter Resistance)

Base Current of Input Differential BJT Amplifier given Emitter Resistance

Go Base Current = Differential Input Voltage/(2*Emitter Resistance*(Common Emitter Current Gain+1))

Collector Current of BJT Differential Amplifier given Emitter Resistance

Go Collector Current = (Common Base Current Gain*Differential Input Voltage)/(2*Emitter Resistance)

Second Emitter Current of BJT Differential Amplifier

Go Second Emitter Current = Current/(1+e^((Differential Input Voltage)/Threshold Voltage))

First Emitter Current of BJT Differential Amplifier

Go First Emitter Current = Current/(1+e^((-Differential Input Voltage)/Threshold Voltage))

Input Bias Current of Differential Amplifier

Go Input Bias Current = Current/(2*(Common Emitter Current Gain+1))

Base Current of Input Differential BJT Amplifier

Go Base Current = Emitter Current/(Common Emitter Current Gain+1)

Collector Current of BJT Differential Amplifier given Emitter Current

Go Collector Current = Common Base Current Gain*Emitter Current

Input Bias Current of Differential Amplifier Formula

Input Bias Current = Current/(2*(Common Emitter Current Gain+1))
I_Bias = i/(2*(β+1))

How do you find the input bias current?

Input bias current (or input offset voltage) may be measured using the test circuit. To measure IB, a large resistance, RS, is inserted in series with the input under test, creating an apparent additional offset voltage equal to IB×RS.

How to Calculate Input Bias Current of Differential Amplifier?

Input Bias Current of Differential Amplifier calculator uses Input Bias Current = Current/(2*(Common Emitter Current Gain+1)) to calculate the Input Bias Current, The input bias current of differential amplifier formula is defined as the average of the currents into the two input terminals with the output at a specified level. It is expressed in units of amperes. The input circuitry of all op-amps requires a certain amount of bias current for proper operation. Input Bias Current is denoted by I_Bias symbol.

How to calculate Input Bias Current of Differential Amplifier using this online calculator? To use this online calculator for Input Bias Current of Differential Amplifier, enter Current (i) & Common Emitter Current Gain (β) and hit the calculate button. Here is how the Input Bias Current of Differential Amplifier calculation can be explained with given input values -> 5392.157 = 550/(2*(50+1)).

FAQ

What is Input Bias Current of Differential Amplifier?

The input bias current of differential amplifier formula is defined as the average of the currents into the two input terminals with the output at a specified level. It is expressed in units of amperes. The input circuitry of all op-amps requires a certain amount of bias current for proper operation and is represented as I_Bias = i/(2*(β+1)) or Input Bias Current = Current/(2*(Common Emitter Current Gain+1)). Current is the rate of flow of charge through a conducting material & Common Emitter Current Gain is defined as the ratio of change in output current divided by change in input current.

How to calculate Input Bias Current of Differential Amplifier?

The input bias current of differential amplifier formula is defined as the average of the currents into the two input terminals with the output at a specified level. It is expressed in units of amperes. The input circuitry of all op-amps requires a certain amount of bias current for proper operation is calculated using Input Bias Current = Current/(2*(Common Emitter Current Gain+1)). To calculate Input Bias Current of Differential Amplifier, you need Current (i) & Common Emitter Current Gain (β). With our tool, you need to enter the respective value for Current & Common Emitter Current Gain 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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