Bias Current of Emitter Follower Solution

STEP 0: Pre-Calculation Summary
Formula Used
Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance
Ib = modulus((-Vcc)+VCEsat2)/RL
This formula uses 1 Functions, 4 Variables
Functions Used
modulus - Modulus of a number is the remainder when that number is divided by another number., modulus
Variables Used
Input Bias Current - (Measured in Ampere) - Input Bias Current is defined as the average of input current in the operational amplifier. It is denoted as IB.
Supply Voltage - (Measured in Volt) - Supply Voltage is also defined defined as the bias voltage applied to the op amp for Q2(transistor 2) pin. It is also defined as as voltage at collector.
Saturation Voltage 2 - (Measured in Volt) - Saturation Voltage 2 of transistor 2 i.e Q2 is the voltage between the collector and emitter terminals when both the base-emitter and base-collector junctions are forward-biased.
Load Resistance - (Measured in Ohm) - Load Resistance is defined as the cumulative resistance of a circuit as seen by the voltage, current or power source driving that circuit.
STEP 1: Convert Input(s) to Base Unit
Supply Voltage: 7.52 Volt --> 7.52 Volt No Conversion Required
Saturation Voltage 2: 13.1 Volt --> 13.1 Volt No Conversion Required
Load Resistance: 2.5 Kilohm --> 2500 Ohm (Check conversion ​here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
Ib = modulus((-Vcc)+VCEsat2)/RL --> modulus((-7.52)+13.1)/2500
Evaluating ... ...
Ib = 0.002232
STEP 3: Convert Result to Output's Unit
0.002232 Ampere -->2.232 Milliampere (Check conversion ​here)
FINAL ANSWER
2.232 Milliampere <-- Input Bias Current
(Calculation completed in 00.020 seconds)

Credits

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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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Class A Output Stage Calculators

Bias Current of Emitter Follower
​ LaTeX ​ Go Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance
Saturation Voltage between Collector-Emitter at Transistor 1
​ LaTeX ​ Go Saturation Voltage 1 = Supply Voltage-Maximum Voltage
Saturation Voltage between Collector-Emitter at Transistor 2
​ LaTeX ​ Go Saturation Voltage 2 = Minimum Voltage+Supply Voltage
Load Voltage
​ LaTeX ​ Go Load Voltage = Input Voltage-Base Emitter Voltage

Bias Current of Emitter Follower Formula

​LaTeX ​Go
Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance
Ib = modulus((-Vcc)+VCEsat2)/RL

What is class A output stage? Where are class A amplifiers used?

A Class A amplifier stage passes the same load current even when no input signal is applied so large heatsinks are needed for the output transistors. These types of devices are basically two transistors within a single package, one small “pilot” transistor and another larger “switching” transistor.

The Class A Amplifier more suitable for outdoor musical systems, since the transistor reproduces the entire audio waveform without ever cutting off. As a result, the sound is very clear and more linear, that is, it contains much lower levels of distortion.

How to Calculate Bias Current of Emitter Follower?

Bias Current of Emitter Follower calculator uses Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance to calculate the Input Bias Current, The Bias current of emitter follower 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 Ib symbol.

How to calculate Bias Current of Emitter Follower using this online calculator? To use this online calculator for Bias Current of Emitter Follower, enter Supply Voltage (Vcc), Saturation Voltage 2 (VCEsat2) & Load Resistance (RL) and hit the calculate button. Here is how the Bias Current of Emitter Follower calculation can be explained with given input values -> 2240 = modulus((-7.52)+13.1)/2500.

FAQ

What is Bias Current of Emitter Follower?
The Bias current of emitter follower 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 Ib = modulus((-Vcc)+VCEsat2)/RL or Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance. Supply Voltage is also defined defined as the bias voltage applied to the op amp for Q2(transistor 2) pin. It is also defined as as voltage at collector, Saturation Voltage 2 of transistor 2 i.e Q2 is the voltage between the collector and emitter terminals when both the base-emitter and base-collector junctions are forward-biased & Load Resistance is defined as the cumulative resistance of a circuit as seen by the voltage, current or power source driving that circuit.
How to calculate Bias Current of Emitter Follower?
The Bias current of emitter follower 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 = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance. To calculate Bias Current of Emitter Follower, you need Supply Voltage (Vcc), Saturation Voltage 2 (VCEsat2) & Load Resistance (RL). With our tool, you need to enter the respective value for Supply Voltage, Saturation Voltage 2 & Load 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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