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Collector-Base Junction Capacitance Formula

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Collector-Base Junction Capacitance in active mode is reverse biased and is the capacitance between collector and base. Check FAQs

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

C_cb - Collector-Base Junction Capacitance?C_cb0 - Collector-Base Junction Capacitance at 0 Voltage?V_DB - Reverse-Bias Voltage?V_binc - Built-In Voltage?m - Grading Coefficient?

Collector-Base Junction Capacitance Example

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Here is how the Collector-Base Junction Capacitance equation looks like with Values.

Here is how the Collector-Base Junction Capacitance equation looks like with Units.

Here is how the Collector-Base Junction Capacitance equation looks like.

0.8428 = \frac{2.3}{{(1 + (\frac{13}{1.15}))}^{0.4}}

0.8428μF = \frac{2.3μF}{{(1 + (\frac{13V}{1.15V}))}^{0.4}}

0.8428 = \frac{2.3}{{(1 + (\frac{13}{1.15}))}^{0.4}}

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Collector-Base Junction Capacitance Solution

Follow our step by step solution on how to calculate Collector-Base Junction Capacitance?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

C cb = \frac{2.3μF}{{(1 + (\frac{13V}{1.15V}))}^{0.4}}

Next Step Convert Units

∴

C cb = \frac{2.3E-6F}{{(1 + (\frac{13V}{1.15V}))}^{0.4}}

Next Step Prepare to Evaluate

∴

C cb = \frac{2.3E-6}{{(1 + (\frac{13}{1.15}))}^{0.4}}

Next Step Evaluate

∴

C cb = 8.42760934851159E-07F

Next Step Convert to Output's Unit

∴

C cb = 0.842760934851159μF

LAST Step Rounding Answer

∴

C cb = 0.8428μF

Collector-Base Junction Capacitance Formula Elements

Variables

Collector-Base Junction Capacitance

Collector-Base Junction Capacitance in active mode is reverse biased and is the capacitance between collector and base.

Symbol: C_cb

Measurement: CapacitanceUnit: μF

Note: Value should be greater than 0.

Formulas to find Collector-Base Junction Capacitance

Collector-Base Junction Capacitance at 0 Voltage

Collector-base junction capacitance at 0 voltage is the capacitance at the junction of collector-base at zero voltage.

Symbol: C_cb0

Measurement: CapacitanceUnit: μF

Note: Value can be positive or negative.

Formulas to find Collector-Base Junction Capacitance at 0 Voltage

Reverse-Bias Voltage

Reverse-bias voltage means putting a voltage across a diode in the opposite direction.

Symbol: V_DB

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Reverse-Bias Voltage

Built-In Voltage

Built-in voltage is simply the difference of the Fermi levels in p- and n-type semiconductors before they were joined.

Symbol: V_binc

Measurement: Electric PotentialUnit: V

Note: Value can be positive or negative.

Formulas to find Built-In Voltage

Grading Coefficient

The grading Coefficient is the parameter estimated using the gradation curve through sieve analysis.

Symbol: m

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Grading Coefficient

Other formulas in Internal Capacitive Effects and High Frequency Model category

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Go Small-Signal Diffusion Capacitance

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Go Small-Signal Diffusion Capacitance of BJT

C eb = 𝛕 F \cdot (\frac{I c}{V th})

Go Base-Emitter Junction Capacitance

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How to Evaluate Collector-Base Junction Capacitance?

Collector-Base Junction Capacitance evaluator uses Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient to evaluate the Collector-Base Junction Capacitance, The Collector-base junction capacitance formula is defined as the capacitance between each of its terminals (i.e., base, emitter, collector). These capacitances ultimately limit amplifier bandwidth. If the signal frequency gets high enough, these capacitances can affect amplifier performance. Collector-Base Junction Capacitance is denoted by C_cb symbol.

How to evaluate Collector-Base Junction Capacitance using this online evaluator? To use this online evaluator for Collector-Base Junction Capacitance, enter Collector-Base Junction Capacitance at 0 Voltage (C_cb0), Reverse-Bias Voltage (V_DB), Built-In Voltage (V_binc) & Grading Coefficient (m) and hit the calculate button.

FAQs on Collector-Base Junction Capacitance

What is the formula to find Collector-Base Junction Capacitance?

The formula of Collector-Base Junction Capacitance is expressed as Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient. Here is an example- 842760.9 = 2.3E-06/(1+(13/1.15))^0.4.

How to calculate Collector-Base Junction Capacitance?

With Collector-Base Junction Capacitance at 0 Voltage (C_cb0), Reverse-Bias Voltage (V_DB), Built-In Voltage (V_binc) & Grading Coefficient (m) we can find Collector-Base Junction Capacitance using the formula - Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient.

Can the Collector-Base Junction Capacitance be negative?

No, the Collector-Base Junction Capacitance, measured in Capacitance cannot be negative.

Which unit is used to measure Collector-Base Junction Capacitance?

Collector-Base Junction Capacitance is usually measured using the Microfarad[μF] for Capacitance. Farad[μF], Kilofarad[μF], Millifarad[μF] are the few other units in which Collector-Base Junction Capacitance can be measured.

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Collector-Base Junction Capacitance Formula

Collector-Base Junction Capacitance Example

Collector-Base Junction Capacitance Solution

Collector-Base Junction Capacitance Formula Elements

Other formulas in Internal Capacitive Effects and High Frequency Model category

How to Evaluate Collector-Base Junction Capacitance?

FAQs on Collector-Base Junction Capacitance

Variable Name