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Small-Signal Diffusion Capacitance of BJT Formula

GoSmall-Signal Diffusion Capacitance Formula

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Emitter-base capacitance is the capacitance between the emitter and the base. Check FAQs

C eb = 𝛕 F \cdot (\frac{I c}{V th})

C_eb - Emitter-Base Capacitance?𝛕_F - Device Constant?I_c - Collector Current?V_th - Threshold Voltage?

Small-Signal Diffusion Capacitance of BJT Example

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Here is how the Small-Signal Diffusion Capacitance of BJT equation looks like with Values.

Here is how the Small-Signal Diffusion Capacitance of BJT equation looks like with Units.

Here is how the Small-Signal Diffusion Capacitance of BJT equation looks like.

1818.1818 = 2 \cdot (\frac{5}{5.5})

1818.1818μF = 2s \cdot (\frac{5mA}{5.5V})

1818.1818 = 2 \cdot (\frac{5}{5.5})

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Small-Signal Diffusion Capacitance of BJT Solution

Follow our step by step solution on how to calculate Small-Signal Diffusion Capacitance of BJT?

FIRST Step Consider the formula

C eb = 𝛕 F \cdot (\frac{I c}{V th})

Next Step Substitute values of Variables

∴

C eb = 2s \cdot (\frac{5mA}{5.5V})

Next Step Convert Units

∴

C eb = 2s \cdot (\frac{0.005A}{5.5V})

Next Step Prepare to Evaluate

∴

C eb = 2 \cdot (\frac{0.005}{5.5})

Next Step Evaluate

∴

C eb = 0.00181818181818182F

Next Step Convert to Output's Unit

∴

C eb = 1818.18181818182μF

LAST Step Rounding Answer

∴

C eb = 1818.1818μF

Small-Signal Diffusion Capacitance of BJT Formula Elements

Variables

Emitter-Base Capacitance

Emitter-base capacitance is the capacitance between the emitter and the base.

Symbol: C_eb

Measurement: CapacitanceUnit: μF

Note: Value can be positive or negative.

Formulas to find Emitter-Base Capacitance

Device Constant

A device constant value is defined once and can be referenced many times throughout a program.

Symbol: 𝛕_F

Measurement: TimeUnit: s

Note: Value can be positive or negative.

Formulas to find Device Constant

Collector Current

Collector current is an amplified output current of a bipolar junction transistor.

Symbol: I_c

Measurement: Electric CurrentUnit: mA

Note: Value can be positive or negative.

Formulas to find Collector Current

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

Other Formulas to find Emitter-Base Capacitance

Go Small-Signal Diffusion Capacitance

C eb = 𝛕 F \cdot G m

Other formulas in Internal Capacitive Effects and High Frequency Model category

Go Stored Electron Charge in Base of BJT

Q n = 𝛕 F \cdot I c

Go Base-Emitter Junction Capacitance

C = 2 \cdot C eb

Go Collector-Base Junction Capacitance

C cb = \frac{C cb0}{{(1 + (\frac{V DB}{V binc}))}^{m}}

Go Transition Frequency of BJT given Device Constant

f t = \frac{1}{2 \cdot π \cdot 𝛕 F}

How to Evaluate Small-Signal Diffusion Capacitance of BJT?

Small-Signal Diffusion Capacitance of BJT evaluator uses Emitter-Base Capacitance = Device Constant*(Collector Current/Threshold Voltage) to evaluate the Emitter-Base Capacitance, The Small-signal diffusion capacitance of BJT formula is defined as capacitance due to transport of charge carriers between two terminals of device, for example, diffusion of carriers from anode to cathode in forward-bias mode of diode or from emitter to base forward-biased junction for transistor. Emitter-Base Capacitance is denoted by C_eb symbol.

How to evaluate Small-Signal Diffusion Capacitance of BJT using this online evaluator? To use this online evaluator for Small-Signal Diffusion Capacitance of BJT, enter Device Constant (𝛕_F), Collector Current (I_c) & Threshold Voltage (V_th) and hit the calculate button.

FAQs on Small-Signal Diffusion Capacitance of BJT

What is the formula to find Small-Signal Diffusion Capacitance of BJT?

The formula of Small-Signal Diffusion Capacitance of BJT is expressed as Emitter-Base Capacitance = Device Constant*(Collector Current/Threshold Voltage). Here is an example- 1.8E+9 = 2*(0.005/5.5).

How to calculate Small-Signal Diffusion Capacitance of BJT?

With Device Constant (𝛕_F), Collector Current (I_c) & Threshold Voltage (V_th) we can find Small-Signal Diffusion Capacitance of BJT using the formula - Emitter-Base Capacitance = Device Constant*(Collector Current/Threshold Voltage).

What are the other ways to Calculate Emitter-Base Capacitance?

Here are the different ways to Calculate Emitter-Base Capacitance-

Emitter-Base Capacitance=Device Constant*Transconductance

Can the Small-Signal Diffusion Capacitance of BJT be negative?

Yes, the Small-Signal Diffusion Capacitance of BJT, measured in Capacitance can be negative.

Which unit is used to measure Small-Signal Diffusion Capacitance of BJT?

Small-Signal Diffusion Capacitance of BJT is usually measured using the Microfarad[μF] for Capacitance. Farad[μF], Kilofarad[μF], Millifarad[μF] are the few other units in which Small-Signal Diffusion Capacitance of BJT can be measured.

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Small-Signal Diffusion Capacitance of BJT Formula

​GoSmall-Signal Diffusion Capacitance Formula

Small-Signal Diffusion Capacitance of BJT Example

Small-Signal Diffusion Capacitance of BJT Solution

Small-Signal Diffusion Capacitance of BJT Formula Elements

Other Formulas to find Emitter-Base Capacitance

Other formulas in Internal Capacitive Effects and High Frequency Model category

How to Evaluate Small-Signal Diffusion Capacitance of BJT?

FAQs on Small-Signal Diffusion Capacitance of BJT

Variable Name

GoSmall-Signal Diffusion Capacitance Formula