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Small-Signal Diffusion Capacitance Formula

GoSmall-Signal Diffusion Capacitance of BJT Formula

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

C eb = 𝛕 F \cdot G m

C_eb - Emitter-Base Capacitance?𝛕_F - Device Constant?G_m - Transconductance?

Small-Signal Diffusion Capacitance Example

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With units

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

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

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

3440 = 2 \cdot 1.72

3440μF = 2s \cdot 1.72mS

3440 = 2 \cdot 1.72

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Small-Signal Diffusion Capacitance Solution

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

FIRST Step Consider the formula

C eb = 𝛕 F \cdot G m

Next Step Substitute values of Variables

∴

C eb = 2s \cdot 1.72mS

Next Step Convert Units

∴

C eb = 2s \cdot 0.0017S

Next Step Prepare to Evaluate

∴

C eb = 2 \cdot 0.0017

Next Step Evaluate

∴

C eb = 0.00344F

LAST Step Convert to Output's Unit

∴

C eb = 3440μF

Small-Signal Diffusion Capacitance 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

Transconductance

Transconductance is the ratio of the change in current at the output terminal to the change in the voltage at the input terminal of an active device.

Symbol: G_m

Measurement: Electric ConductanceUnit: mS

Note: Value can be positive or negative.

Formulas to find Transconductance

Other Formulas to find Emitter-Base Capacitance

Go Small-Signal Diffusion Capacitance of BJT

C eb = 𝛕 F \cdot (\frac{I c}{V th})

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?

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

How to evaluate Small-Signal Diffusion Capacitance using this online evaluator? To use this online evaluator for Small-Signal Diffusion Capacitance, enter Device Constant (𝛕_F) & Transconductance (G_m) and hit the calculate button.

FAQs on Small-Signal Diffusion Capacitance

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

The formula of Small-Signal Diffusion Capacitance is expressed as Emitter-Base Capacitance = Device Constant*Transconductance. Here is an example- 3.4E+9 = 2*0.00172.

How to calculate Small-Signal Diffusion Capacitance?

With Device Constant (𝛕_F) & Transconductance (G_m) we can find Small-Signal Diffusion Capacitance using the formula - Emitter-Base Capacitance = Device Constant*Transconductance.

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*(Collector Current/Threshold Voltage)

Can the Small-Signal Diffusion Capacitance be negative?

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

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

Small-Signal Diffusion Capacitance 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 can be measured.

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Small-Signal Diffusion Capacitance Formula

​GoSmall-Signal Diffusion Capacitance of BJT Formula

Small-Signal Diffusion Capacitance Example

Small-Signal Diffusion Capacitance Solution

Small-Signal Diffusion Capacitance 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?

FAQs on Small-Signal Diffusion Capacitance

Variable Name

GoSmall-Signal Diffusion Capacitance of BJT Formula