Collector-Base Junction Capacitance Calculator

✖Collector-base junction capacitance at 0 voltage is the capacitance at the junction of collector-base at zero voltage.ⓘ Collector-Base Junction Capacitance at 0 Voltage [C_cb0]			+10% -10%
✖Reverse-bias voltage means putting a voltage across a diode in the opposite direction.ⓘ Reverse-Bias Voltage [V_DB]			+10% -10%
✖Built-in voltage is simply the difference of the Fermi levels in p- and n-type semiconductors before they were joined.ⓘ Built-In Voltage [V_binc]			+10% -10%
✖The grading Coefficient is the parameter estimated using the gradation curve through sieve analysis.ⓘ Grading Coefficient [m]			+10% -10%

✖Collector-Base Junction Capacitance in active mode is reverse biased and is the capacitance between collector and base.ⓘ Collector-Base Junction Capacitance [C_cb]

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Collector-Base Junction Capacitance Solution

STEP 0: Pre-Calculation Summary

Formula Used

Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient
C_cb = C_cb0/(1+(V_DB/V_binc))^m
This formula uses 5 Variables

Variables Used

Collector-Base Junction Capacitance - (Measured in Farad) - Collector-Base Junction Capacitance in active mode is reverse biased and is the capacitance between collector and base.
Collector-Base Junction Capacitance at 0 Voltage - (Measured in Farad) - Collector-base junction capacitance at 0 voltage is the capacitance at the junction of collector-base at zero voltage.
Reverse-Bias Voltage - (Measured in Volt) - Reverse-bias voltage means putting a voltage across a diode in the opposite direction.
Built-In Voltage - (Measured in Volt) - Built-in voltage is simply the difference of the Fermi levels in p- and n-type semiconductors before they were joined.
Grading Coefficient - The grading Coefficient is the parameter estimated using the gradation curve through sieve analysis.

STEP 1: Convert Input(s) to Base Unit

Collector-Base Junction Capacitance at 0 Voltage: 2.3 Microfarad --> 2.3E-06 Farad (Check conversion here)
Reverse-Bias Voltage: 13 Volt --> 13 Volt No Conversion Required
Built-In Voltage: 1.15 Volt --> 1.15 Volt No Conversion Required
Grading Coefficient: 0.4 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

C_cb = C_cb0/(1+(V_DB/V_binc))^m --> 2.3E-06/(1+(13/1.15))^0.4

Evaluating ... ...

C_cb = 8.42760934851159E-07

STEP 3: Convert Result to Output's Unit

8.42760934851159E-07 Farad -->0.842760934851159 Microfarad (Check conversion here)

FINAL ANSWER

0.842760934851159 ≈ 0.842761 Microfarad <-- Collector-Base Junction Capacitance

(Calculation completed in 00.020 seconds)

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Home » Engineering » Electronics » BJT » Analog Electronics » Internal Capacitive Effects and High Frequency Model » Collector-Base Junction Capacitance

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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< Internal Capacitive Effects and High Frequency Model Calculators

Small-Signal Diffusion Capacitance of BJT

LaTeX Go Emitter-Base Capacitance = Device Constant*(Collector Current/Threshold Voltage)

Small-Signal Diffusion Capacitance

LaTeX Go Emitter-Base Capacitance = Device Constant*Transconductance

Stored Electron Charge in Base of BJT

LaTeX Go Stored Electron Charge = Device Constant*Collector Current

Base-Emitter Junction Capacitance

LaTeX Go Base–Emitter Junction Capacitance = 2*Emitter-Base Capacitance

Collector-Base Junction Capacitance Formula

LaTeX Go

Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient
C_cb = C_cb0/(1+(V_DB/V_binc))^m

What is collector base and emitter?

The emitter-base junction injects a large amount of majority charge carrier into the base because it is heavily doped and moderate in size. Collector – The section which collects the major portion of the majority charge carrier supplied by the emitter is called a collector.

How to Calculate Collector-Base Junction Capacitance?

Collector-Base Junction Capacitance calculator uses Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient to calculate 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 calculate Collector-Base Junction Capacitance using this online calculator? To use this online calculator 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. Here is how the Collector-Base Junction Capacitance calculation can be explained with given input values -> 842760.9 = 2.3E-06/(1+(13/1.15))^0.4.

FAQ

What is 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 and is represented as C_cb = C_cb0/(1+(V_DB/V_binc))^m or Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient. Collector-base junction capacitance at 0 voltage is the capacitance at the junction of collector-base at zero voltage, Reverse-bias voltage means putting a voltage across a diode in the opposite direction, Built-in voltage is simply the difference of the Fermi levels in p- and n-type semiconductors before they were joined & The grading Coefficient is the parameter estimated using the gradation curve through sieve analysis.

How to calculate 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 is calculated using Collector-Base Junction Capacitance = Collector-Base Junction Capacitance at 0 Voltage/(1+(Reverse-Bias Voltage/Built-In Voltage))^Grading Coefficient. To calculate Collector-Base Junction Capacitance, you need Collector-Base Junction Capacitance at 0 Voltage (C_cb0), Reverse-Bias Voltage (V_DB), Built-In Voltage (V_binc) & Grading Coefficient (m). With our tool, you need to enter the respective value for Collector-Base Junction Capacitance at 0 Voltage, Reverse-Bias Voltage, Built-In Voltage & Grading Coefficient and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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