Collector Base Capacitance Calculator

✖Cut-off frequency in BJT is defined as corner frequency is a boundary in system's frequency response at which energy flowing through system begins to be reduced rather than passing through.ⓘ Cut-off Frequency in BJT [f_co]			+10% -10%
✖Maximum frequency of oscillations is defined as the practical upper bound for useful circuit operation with BJT.ⓘ Maximum Frequency of Oscillations [f_m]			+10% -10%
✖Base resistance is the resistance of the base junction.ⓘ Base Resistance [R_b]			+10% -10%

✖Collector Base Capacitance refers to the capacitance that exists between the collector and the base of a bipolar junction transistor (BJT).ⓘ Collector Base Capacitance [C_c]

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Formula

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Collector Base Capacitance

Formula

`"C"_{"c"} = "f"_{"co"}/(8*pi*"f"_{"m"}^2*"R"_{"b"})`

Example

`"255.8333μF"="30Hz"/(8*pi*("69Hz")^2*"0.98Ω")`

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Collector Base Capacitance Solution

STEP 0: Pre-Calculation Summary

Formula Used

Collector Base Capacitance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Base Resistance)
C_c = f_co/(8*pi*f_m^2*R_b)
This formula uses 1 Constants, 4 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Collector Base Capacitance - (Measured in Farad) - Collector Base Capacitance refers to the capacitance that exists between the collector and the base of a bipolar junction transistor (BJT).
Cut-off Frequency in BJT - (Measured in Hertz) - Cut-off frequency in BJT is defined as corner frequency is a boundary in system's frequency response at which energy flowing through system begins to be reduced rather than passing through.
Maximum Frequency of Oscillations - (Measured in Hertz) - Maximum frequency of oscillations is defined as the practical upper bound for useful circuit operation with BJT.
Base Resistance - (Measured in Ohm) - Base resistance is the resistance of the base junction.

STEP 1: Convert Input(s) to Base Unit

Cut-off Frequency in BJT: 30 Hertz --> 30 Hertz No Conversion Required
Maximum Frequency of Oscillations: 69 Hertz --> 69 Hertz No Conversion Required
Base Resistance: 0.98 Ohm --> 0.98 Ohm No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

C_c = f_co/(8*pi*f_m^2*R_b) --> 30/(8*pi*69^2*0.98)

Evaluating ... ...

C_c = 0.000255833338303395

STEP 3: Convert Result to Output's Unit

0.000255833338303395 Farad -->255.833338303395 Microfarad (Check conversion here)

FINAL ANSWER

255.833338303395 ≈ 255.8333 Microfarad <-- Collector Base Capacitance

(Calculation completed in 00.004 seconds)

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< 15 BJT Microwave Devices Calculators

Maximum Frequency of Oscillations

Go Maximum Frequency of Oscillations = sqrt(Common Emitter Short Circuit Gain Frequency/(8*pi*Base Resistance*Collector Base Capacitance))

Emitter Base Charging Time

Go Emitter Charging Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Base Transit Time)

Base Collector Delay Time

Go Base Collector Delay Time = Emitter Collector Delay Time-(Collector Charging Time+Base Transit Time+Emitter Charging Time)

Collector Charging Time

Go Collector Charging Time = Emitter Collector Delay Time-(Base Collector Delay Time+Base Transit Time+Emitter Charging Time)

Base Transit Time

Go Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time)

Emitter to Collector Delay Time

Go Emitter Collector Delay Time = Base Collector Delay Time+Collector Charging Time+Base Transit Time+Emitter Charging Time

Collector Base Capacitance

Go Collector Base Capacitance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Base Resistance)

Base Resistance

Go Base Resistance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Collector Base Capacitance)

Avalanche Multiplication Factor

Go Avalanche Multiplication Factor = 1/(1-(Applied Voltage/Avalanche Breakdown Voltage)^Doping Numerical Factor)

Saturation Drift Velocity

Go Saturated Drift Velocity in BJT = Emitter to Collector Distance/Average Time to Traverse Emitter to Collector

Emitter to Collector Distance

Go Emitter to Collector Distance = Maximum Applied Voltage in BJT/Maximum Electric Field in BJT

Total Charging Time

Go Total Charging Time = Emitter Charging Time+Collector Charging Time

Cut-off Frequency of Microwave

Go Cut-off Frequency in BJT = 1/(2*pi*Emitter Collector Delay Time)

Total Transit Time

Go Total Transit Time = Base Transit Time+Collector Depletion Region

Hole Current of Emitter

Go Hole Current of Emitter = Base Current+Collector Current

Collector Base Capacitance Formula

Collector Base Capacitance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Base Resistance)
C_c = f_co/(8*pi*f_m^2*R_b)

What is Frequency of Oscillation Wave?

Frequency of oscillation (f) (or just frequency): the number of times the wave pattern repeats itself in one second

How to Calculate Collector Base Capacitance?

Collector Base Capacitance calculator uses Collector Base Capacitance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Base Resistance) to calculate the Collector Base Capacitance, Collector Base Capacitance refers to the capacitance that exists between the collector and the base of a bipolar junction transistor (BJT). This capacitance arises due to the depletion region that forms at the collector-base junction when the transistor is biased in the forward-active mode. Collector Base Capacitance is denoted by C_c symbol.

How to calculate Collector Base Capacitance using this online calculator? To use this online calculator for Collector Base Capacitance, enter Cut-off Frequency in BJT (f_co), Maximum Frequency of Oscillations (f_m) & Base Resistance (R_b) and hit the calculate button. Here is how the Collector Base Capacitance calculation can be explained with given input values -> 2.6E+8 = 30/(8*pi*69^2*0.98).

FAQ

What is Collector Base Capacitance?

Collector Base Capacitance refers to the capacitance that exists between the collector and the base of a bipolar junction transistor (BJT). This capacitance arises due to the depletion region that forms at the collector-base junction when the transistor is biased in the forward-active mode and is represented as C_c = f_co/(8*pi*f_m^2*R_b) or Collector Base Capacitance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Base Resistance). Cut-off frequency in BJT is defined as corner frequency is a boundary in system's frequency response at which energy flowing through system begins to be reduced rather than passing through, Maximum frequency of oscillations is defined as the practical upper bound for useful circuit operation with BJT & Base resistance is the resistance of the base junction.

How to calculate Collector Base Capacitance?

Collector Base Capacitance refers to the capacitance that exists between the collector and the base of a bipolar junction transistor (BJT). This capacitance arises due to the depletion region that forms at the collector-base junction when the transistor is biased in the forward-active mode is calculated using Collector Base Capacitance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Base Resistance). To calculate Collector Base Capacitance, you need Cut-off Frequency in BJT (f_co), Maximum Frequency of Oscillations (f_m) & Base Resistance (R_b). With our tool, you need to enter the respective value for Cut-off Frequency in BJT, Maximum Frequency of Oscillations & Base Resistance 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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