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Emitter Resistance in Widlar Current Source Formula

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Emitter Resistance is the emitter-degeneration resistance of the emitter-base junction diode of a transistor. Check FAQs

R e = (\frac{V th}{I o}) \cdot \log 10 (\frac{I ref}{I o})

R_e - Emitter Resistance?V_th - Threshold Voltage?I_o - Output Current?I_ref - Reference Current?

Emitter Resistance in Widlar Current Source Example

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With units

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Here is how the Emitter Resistance in Widlar Current Source equation looks like with Values.

Here is how the Emitter Resistance in Widlar Current Source equation looks like with Units.

Here is how the Emitter Resistance in Widlar Current Source equation looks like.

0.9092 = (\frac{25}{5}) \cdot \log 10 (\frac{7.6}{5})

0.9092kΩ = (\frac{25V}{5mA}) \cdot \log 10 (\frac{7.6mA}{5mA})

0.9092 = (\frac{25}{5}) \cdot \log 10 (\frac{7.6}{5})

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Emitter Resistance in Widlar Current Source Solution

Follow our step by step solution on how to calculate Emitter Resistance in Widlar Current Source?

FIRST Step Consider the formula

R e = (\frac{V th}{I o}) \cdot \log 10 (\frac{I ref}{I o})

Next Step Substitute values of Variables

∴

R e = (\frac{25V}{5mA}) \cdot \log 10 (\frac{7.6mA}{5mA})

Next Step Convert Units

∴

R e = (\frac{25V}{0.005A}) \cdot \log 10 (\frac{0.0076A}{0.005A})

Next Step Prepare to Evaluate

∴

R e = (\frac{25}{0.005}) \cdot \log 10 (\frac{0.0076}{0.005})

Next Step Evaluate

∴

R e = 909.217939723863Ω

Next Step Convert to Output's Unit

∴

R e = 0.909217939723863kΩ

LAST Step Rounding Answer

∴

R e = 0.9092kΩ

Emitter Resistance in Widlar Current Source Formula Elements

Variables

Functions

Emitter Resistance

Emitter Resistance is the emitter-degeneration resistance of the emitter-base junction diode of a transistor.

Symbol: R_e

Measurement: Electric ResistanceUnit: kΩ

Note: Value should be greater than 0.

Formulas to find Emitter Resistance

Threshold Voltage

Threshold voltage of transistor is the minimum gate to source voltage that is needed to create a conducting path between the source and drain terminals.

Symbol: V_th

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Threshold Voltage

Output Current

Output Current is the current the amplifier draws from the signal source.

Symbol: I_o

Measurement: Electric CurrentUnit: mA

Note: Value should be greater than 0.

Formulas to find Output Current

Reference Current

A reference current is just a stable source of current that does not fluctuate over temperature, supply voltages or loads.

Symbol: I_ref

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Formulas to find Reference Current

log10

The common logarithm, also known as the base-10 logarithm or the decimal logarithm, is a mathematical function that is the inverse of the exponential function.

Syntax: log10(Number)

Other formulas in IC Amplifiers category

Go Finite Output Resistance of IC Amplifier

R fo = \frac{ΔV o}{ΔI o}

Go Output Current

I out = I ref \cdot (\frac{I t2}{I t1})

Go Intrinsic Gain of IC Amplifier

G i = 2 \cdot \frac{V e}{V ov}

Go Reference Current of IC Amplifier

I ref = I o \cdot (\frac{WL}{WL 1})

How to Evaluate Emitter Resistance in Widlar Current Source?

Emitter Resistance in Widlar Current Source evaluator uses Emitter Resistance = (Threshold Voltage/Output Current)*log10(Reference Current/Output Current) to evaluate the Emitter Resistance, The Emitter resistance in Widlar Current Source formula is defined as the opposition offered in the emitter region of the Widlar Current Source. Emitter Resistance is denoted by R_e symbol.

How to evaluate Emitter Resistance in Widlar Current Source using this online evaluator? To use this online evaluator for Emitter Resistance in Widlar Current Source, enter Threshold Voltage (V_th), Output Current (I_o) & Reference Current (I_ref) and hit the calculate button.

FAQs on Emitter Resistance in Widlar Current Source

What is the formula to find Emitter Resistance in Widlar Current Source?

The formula of Emitter Resistance in Widlar Current Source is expressed as Emitter Resistance = (Threshold Voltage/Output Current)*log10(Reference Current/Output Current). Here is an example- 0.000909 = (25/0.005)*log10(0.0076/0.005).

How to calculate Emitter Resistance in Widlar Current Source?

With Threshold Voltage (V_th), Output Current (I_o) & Reference Current (I_ref) we can find Emitter Resistance in Widlar Current Source using the formula - Emitter Resistance = (Threshold Voltage/Output Current)*log10(Reference Current/Output Current). This formula also uses Common Logarithm (log10) function(s).

Can the Emitter Resistance in Widlar Current Source be negative?

No, the Emitter Resistance in Widlar Current Source, measured in Electric Resistance cannot be negative.

Which unit is used to measure Emitter Resistance in Widlar Current Source?

Emitter Resistance in Widlar Current Source is usually measured using the Kilohm[kΩ] for Electric Resistance. Ohm[kΩ], Megohm[kΩ], Microhm[kΩ] are the few other units in which Emitter Resistance in Widlar Current Source can be measured.

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Emitter Resistance in Widlar Current Source Formula

Emitter Resistance in Widlar Current Source Example

Emitter Resistance in Widlar Current Source Solution

Emitter Resistance in Widlar Current Source Formula Elements

Other formulas in IC Amplifiers category

How to Evaluate Emitter Resistance in Widlar Current Source?

FAQs on Emitter Resistance in Widlar Current Source

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