Bias Current of Emitter Follower Calculator

✖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.ⓘ Supply Voltage [V_cc]			+10% -10%
✖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.ⓘ Saturation Voltage 2 [V_CEsat2]			+10% -10%
✖Load Resistance is defined as the cumulative resistance of a circuit as seen by the voltage, current or power source driving that circuit.ⓘ Load Resistance [R_L]			+10% -10%

✖Input Bias Current is defined as the average of input current in the operational amplifier. It is denoted as I_B.ⓘ Bias Current of Emitter Follower [I_b]

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Formula

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Bias Current of Emitter Follower

Formula

`"I"_{"b"} = "modulus"((-"V"_{"cc"})+"V"_{"CEsat2"})/"R"_{"L"}`

Example

`"2.232mA"="modulus"((-"7.52V")+"13.1V")/"2.5kΩ"`

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Bias Current of Emitter Follower Solution

STEP 0: Pre-Calculation Summary

Formula Used

Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance
I_b = modulus((-V_cc)+V_CEsat2)/R_L
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 I_B.
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

I_b = modulus((-V_cc)+V_CEsat2)/R_L --> modulus((-7.52)+13.1)/2500

Evaluating ... ...

I_b = 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 00.004 seconds)

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Home » Engineering » Electronics » Amplifiers » Output Stages and Power Amplifiers » Class A Output Stage » Bias Current of Emitter Follower

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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 Class A Output Stage Calculators

Power Conversion Efficiency of Class A Output Stage

Go Power Conversion Efficiency of Class A = 1/4*(Peak Amplitude Voltage^2/(Input Bias Current*Load Resistance*Supply Voltage))

Bias Current of Emitter Follower

Go Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance

Power Output Capability Factor

Go Power Output Capability Factor = (Maximum Output Power)/(Peak Drain Voltage*Peak Drain Current)

Peak Output Voltage Value at Average Load Power

Go Peak Amplitude Voltage = sqrt(2*Load Resistance*Average Load Power)

Instantaneous Power Dissipation of Emitter-Follower

Go Instantaneous Power Dissipation = Collector to Emitter Voltage*Collector Current

Load Power of Output Stage

Go Load Power of Output Stage = Supply Power*Power Conversion Efficiency

Supply Power of Output Stage

Go Supply Power of Output Stage = 2*Supply Voltage*Input Bias Current

Saturation Voltage between Collector-Emitter at Transistor 1

Go Saturation Voltage 1 = Supply Voltage-Maximum Voltage

Saturation Voltage between Collector-Emitter at Transistor 2

Go Saturation Voltage 2 = Minimum Voltage+Supply Voltage

Load Voltage

Go Load Voltage = Input Voltage-Base Emitter Voltage

Drain Current of Class B Amplifier

Go Drain Current = 2*(Output Current/pi)

Bias Current of Emitter Follower Formula

Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance
I_b = modulus((-V_cc)+V_CEsat2)/R_L

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 I_b 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 (V_cc), Saturation Voltage 2 (V_CEsat2) & Load Resistance (R_L) 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 I_b = modulus((-V_cc)+V_CEsat2)/R_L 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 (V_cc), Saturation Voltage 2 (V_CEsat2) & Load Resistance (R_L). 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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