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Bias Current of Emitter Follower Formula

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Input Bias Current is defined as the average of input current in the operational amplifier. It is denoted as I_B. Check FAQs

I b = mod \underset{̲}{u} s \frac{(- V cc) + V CEsat2}{R L}

I_b - Input Bias Current?V_cc - Supply Voltage?V_CEsat2 - Saturation Voltage 2?R_L - Load Resistance?

Bias Current of Emitter Follower Example

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Here is how the Bias Current of Emitter Follower equation looks like with Values.

Here is how the Bias Current of Emitter Follower equation looks like with Units.

Here is how the Bias Current of Emitter Follower equation looks like.

2.232 = mod \underset{̲}{u} s \frac{(- 7.52) + 13.1}{2.5}

2.232mA = mod \underset{̲}{u} s \frac{(- 7.52V) + 13.1V}{2.5kΩ}

2.232 = mod \underset{̲}{u} s \frac{(- 7.52) + 13.1}{2.5}

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Bias Current of Emitter Follower Solution

Follow our step by step solution on how to calculate Bias Current of Emitter Follower?

FIRST Step Consider the formula

I b = mod \underset{̲}{u} s \frac{(- V cc) + V CEsat2}{R L}

Next Step Substitute values of Variables

∴

I b = mod \underset{̲}{u} s \frac{(- 7.52V) + 13.1V}{2.5kΩ}

Next Step Convert Units

∴

I b = mod \underset{̲}{u} s \frac{(- 7.52V) + 13.1V}{2500Ω}

Next Step Prepare to Evaluate

∴

I b = mod \underset{̲}{u} s \frac{(- 7.52) + 13.1}{2500}

Next Step Evaluate

∴

I b = 0.002232A

LAST Step Convert to Output's Unit

∴

I b = 2.232mA

Bias Current of Emitter Follower Formula Elements

Variables

Functions

Input Bias Current

Input Bias Current is defined as the average of input current in the operational amplifier. It is denoted as I_B.

Symbol: I_b

Measurement: Electric CurrentUnit: mA

Note: Value should be greater than 0.

Formulas to find Input Bias Current

Supply Voltage

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.

Symbol: V_cc

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Supply Voltage

Saturation Voltage 2

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.

Symbol: V_CEsat2

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Saturation Voltage 2

Load Resistance

Load Resistance is defined as the cumulative resistance of a circuit as seen by the voltage, current or power source driving that circuit.

Symbol: R_L

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Load Resistance

modulus

Modulus of a number is the remainder when that number is divided by another number.

Syntax: modulus

Other formulas in Class A Output Stage category

Go Load Voltage

V L = V in - V be

Go Saturation Voltage between Collector-Emitter at Transistor 1

V CEsat1 = V cc - V max

Go Saturation Voltage between Collector-Emitter at Transistor 2

V CEsat2 = V min + V cc

Go Instantaneous Power Dissipation of Emitter-Follower

P I = V ce \cdot I c

How to Evaluate Bias Current of Emitter Follower?

Bias Current of Emitter Follower evaluator uses Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance to evaluate 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 evaluate Bias Current of Emitter Follower using this online evaluator? To use this online evaluator 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.

FAQs on Bias Current of Emitter Follower

What is the formula to find Bias Current of Emitter Follower?

The formula of Bias Current of Emitter Follower is expressed as Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance. Here is an example- 2240 = modulus((-7.52)+13.1)/2500.

How to calculate Bias Current of Emitter Follower?

With Supply Voltage (V_cc), Saturation Voltage 2 (V_CEsat2) & Load Resistance (R_L) we can find Bias Current of Emitter Follower using the formula - Input Bias Current = modulus((-Supply Voltage)+Saturation Voltage 2)/Load Resistance. This formula also uses "Modulus Function" function(s).

Can the Bias Current of Emitter Follower be negative?

No, the Bias Current of Emitter Follower, measured in Electric Current cannot be negative.

Which unit is used to measure Bias Current of Emitter Follower?

Bias Current of Emitter Follower is usually measured using the Milliampere[mA] for Electric Current. Ampere[mA], Microampere[mA], Centiampere[mA] are the few other units in which Bias Current of Emitter Follower can be measured.

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Bias Current of Emitter Follower Formula

Bias Current of Emitter Follower Example

Bias Current of Emitter Follower Solution

Bias Current of Emitter Follower Formula Elements

Other formulas in Class A Output Stage category

How to Evaluate Bias Current of Emitter Follower?

FAQs on Bias Current of Emitter Follower

Variable Name