Base Resistance 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%
✖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]			+10% -10%

✖Base resistance is the resistance of the base junction.ⓘ Base Resistance [R_b]

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Base Resistance Solution

STEP 0: Pre-Calculation Summary

Formula Used

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

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Base Resistance - (Measured in Ohm) - Base resistance is the resistance of the base junction.
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.
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).

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
Collector Base Capacitance: 255 Microfarad --> 0.000255 Farad (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

R_b = f_co/(8*pi*f_m^2*C_c) --> 30/(8*pi*69^2*0.000255)

Evaluating ... ...

R_b = 0.983202633479715

STEP 3: Convert Result to Output's Unit

0.983202633479715 Ohm --> No Conversion Required

FINAL ANSWER

0.983202633479715 ≈ 0.983203 Ohm <-- Base Resistance

(Calculation completed in 00.004 seconds)

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Created by Shobhit Dimri

Bipin Tripathi Kumaon Institute of Technology (BTKIT), Dwarahat

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< BJT Microwave Devices Calculators

Base Collector Delay Time

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

Collector Charging Time

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

Base Transit Time

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

Cut-off Frequency of Microwave

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

Base Resistance Formula

LaTeX Go

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

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 Base Resistance?

Base Resistance calculator uses Base Resistance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Collector Base Capacitance) to calculate the Base Resistance, The Base Resistance formula is defined as a base resistor that controls the amount of current entering the base junction of a bipolar junction transistor (BJT) to cause it to conduct in the saturation region. Base Resistance is denoted by R_b symbol.

How to calculate Base Resistance using this online calculator? To use this online calculator for Base Resistance, enter Cut-off Frequency in BJT (f_co), Maximum Frequency of Oscillations (f_m) & Collector Base Capacitance (C_c) and hit the calculate button. Here is how the Base Resistance calculation can be explained with given input values -> 0.983203 = 30/(8*pi*69^2*0.000255).

FAQ

What is Base Resistance?

The Base Resistance formula is defined as a base resistor that controls the amount of current entering the base junction of a bipolar junction transistor (BJT) to cause it to conduct in the saturation region and is represented as R_b = f_co/(8*pi*f_m^2*C_c) or Base Resistance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Collector Base Capacitance). 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 & Collector Base Capacitance refers to the capacitance that exists between the collector and the base of a bipolar junction transistor (BJT).

How to calculate Base Resistance?

The Base Resistance formula is defined as a base resistor that controls the amount of current entering the base junction of a bipolar junction transistor (BJT) to cause it to conduct in the saturation region is calculated using Base Resistance = Cut-off Frequency in BJT/(8*pi*Maximum Frequency of Oscillations^2*Collector Base Capacitance). To calculate Base Resistance, you need Cut-off Frequency in BJT (f_co), Maximum Frequency of Oscillations (f_m) & Collector Base Capacitance (C_c). With our tool, you need to enter the respective value for Cut-off Frequency in BJT, Maximum Frequency of Oscillations & Collector Base Capacitance 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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