Transition Frequency of BJT Calculator

✖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.ⓘ Transconductance [G_m]			+10% -10%
✖Emitter-base capacitance is the capacitance between the emitter and the base.ⓘ Emitter-Base Capacitance [C_eb]			+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]			+10% -10%

✖The Transition Frequency associated with the transition (1 to 2 or 2 to 1) between two different vibrational levels.ⓘ Transition Frequency of BJT [f_t]

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Formula

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Transition Frequency of BJT

Formula

f t = \frac{G m}{2 \cdot π \cdot (C eb + C cb)}

Example

101.3876 Hz = \frac{1.72 mS}{2 \cdot π \cdot (1.5 μF + 1.2 μF)}

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Transition Frequency of BJT Solution

STEP 0: Pre-Calculation Summary

Formula Used

Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance))
f_t = G_m/(2*pi*(C_eb+C_cb))
This formula uses 1 Constants, 4 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Transition Frequency - (Measured in Hertz) - The Transition Frequency associated with the transition (1 to 2 or 2 to 1) between two different vibrational levels.
Transconductance - (Measured in Siemens) - 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.
Emitter-Base Capacitance - (Measured in Farad) - Emitter-base capacitance is the capacitance between the emitter and the base.
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.

STEP 1: Convert Input(s) to Base Unit

Transconductance: 1.72 Millisiemens --> 0.00172 Siemens (Check conversion here)
Emitter-Base Capacitance: 1.5 Microfarad --> 1.5E-06 Farad (Check conversion here)
Collector-Base Junction Capacitance: 1.2 Microfarad --> 1.2E-06 Farad (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

f_t = G_m/(2*pi*(C_eb+C_cb)) --> 0.00172/(2*pi*(1.5E-06+1.2E-06))

Evaluating ... ...

f_t = 101.387593377059

STEP 3: Convert Result to Output's Unit

101.387593377059 Hertz --> No Conversion Required

FINAL ANSWER

101.387593377059 ≈ 101.3876 Hertz <-- Transition Frequency

(Calculation completed in 00.004 seconds)

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Home » Engineering » Electronics » BJT » Analog Electronics » Internal Capacitive Effects and High Frequency Model » Transition Frequency of BJT

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Created by Payal Priya

Birsa Institute of Technology (BIT), Sindri

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National Institute Of Technology (NIT), Hamirpur

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< Internal Capacitive Effects and High Frequency Model Calculators

Small-Signal Diffusion Capacitance of BJT

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

Small-Signal Diffusion Capacitance

Go Emitter-Base Capacitance = Device Constant*Transconductance

Stored Electron Charge in Base of BJT

Go Stored Electron Charge = Device Constant*Collector Current

Base-Emitter Junction Capacitance

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

< BJT Circuit Calculators

Total Power Dissipated in BJT

Go Power = Collector-Emitter Voltage*Collector Current+Base-Emitter Voltage*Base Current

Common Mode Rejection Ratio

Go Common Mode Rejection Ratio = 20*log10(Differential Mode Gain/Common Mode Gain)

Common-Base Current Gain

Go Common-Base Current Gain = Common Emitter Current Gain/(Common Emitter Current Gain+1)

Intrinsic Gain of BJT

Go Intrinsic Gain = Early Voltage/Thermal Voltage

Transition Frequency of BJT Formula

Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance))
f_t = G_m/(2*pi*(C_eb+C_cb))

What is the function of BJT?

The main basic function of a BJT is to amplify current it will allow BJTs are used as amplifiers or switches to produce wide applicability in electronic equipment include mobile phones, industrial control, television, and radio transmitters.

How to Calculate Transition Frequency of BJT?

Transition Frequency of BJT calculator uses Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance)) to calculate the Transition Frequency, The Transition frequency of BJT formula is defined as the frequency at which the current gain, with a short circuit (at HF) output, is unity. Transition Frequency is denoted by f_t symbol.

How to calculate Transition Frequency of BJT using this online calculator? To use this online calculator for Transition Frequency of BJT, enter Transconductance (G_m), Emitter-Base Capacitance (C_eb) & Collector-Base Junction Capacitance (C_cb) and hit the calculate button. Here is how the Transition Frequency of BJT calculation can be explained with given input values -> 101.3876 = 0.00172/(2*pi*(1.5E-06+1.2E-06)).

FAQ

What is Transition Frequency of BJT?

The Transition frequency of BJT formula is defined as the frequency at which the current gain, with a short circuit (at HF) output, is unity and is represented as f_t = G_m/(2*pi*(C_eb+C_cb)) or Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance)). 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, Emitter-base capacitance is the capacitance between the emitter and the base & Collector-Base Junction Capacitance in active mode is reverse biased and is the capacitance between collector and base.

How to calculate Transition Frequency of BJT?

The Transition frequency of BJT formula is defined as the frequency at which the current gain, with a short circuit (at HF) output, is unity is calculated using Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance)). To calculate Transition Frequency of BJT, you need Transconductance (G_m), Emitter-Base Capacitance (C_eb) & Collector-Base Junction Capacitance (C_cb). With our tool, you need to enter the respective value for Transconductance, Emitter-Base Capacitance & Collector-Base Junction Capacitance and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Transition Frequency?

In this formula, Transition Frequency uses Transconductance, Emitter-Base Capacitance & Collector-Base Junction Capacitance. We can use 1 other way(s) to calculate the same, which is/are as follows -

Transition Frequency = 1/(2*pi*Device Constant)

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