FormulaDen.com

Physics Chemistry Math Chemical Engineering Civil Electrical Electronics Electronics and Instrumentation Materials Science Mechanical Production Engineering Financial Health

Transition Frequency of BJT Formula

Fx Copy

LaTeX Copy

The Transition Frequency associated with the transition (1 to 2 or 2 to 1) between two different vibrational levels. Check FAQs

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

f_t - Transition Frequency?G_m - Transconductance?C_eb - Emitter-Base Capacitance?C_cb - Collector-Base Junction Capacitance?π - Archimedes' constant?

Transition Frequency of BJT Example

With values

With units

Only example

Here is how the Transition Frequency of BJT equation looks like with Values.

Here is how the Transition Frequency of BJT equation looks like with Units.

Here is how the Transition Frequency of BJT equation looks like.

101.3876 = \frac{1.72}{2 \cdot 3.1416 \cdot (1.5 + 1.2)}

101.3876Hz = \frac{1.72mS}{2 \cdot 3.1416 \cdot (1.5μF + 1.2μF)}

101.3876 = \frac{1.72}{2 \cdot 3.1416 \cdot (1.5 + 1.2)}

Tip: Use pencil ( Pencil

) icon above to edit Input Values and Units.

Calculate

Recalculate

Solution

Copy

Reset

You are here -

Home » Category

Engineering » Category

Electronics » Category

Analog Electronics » fx Transition Frequency of BJT

Transition Frequency of BJT Solution

Follow our step by step solution on how to calculate Transition Frequency of BJT?

FIRST Step Consider the formula

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

Next Step Substitute values of Variables

∴

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

Next Step Substitute values of Constants

∴

f t = \frac{1.72mS}{2 \cdot 3.1416 \cdot (1.5μF + 1.2μF)}

Next Step Convert Units

∴

f t = \frac{0.0017S}{2 \cdot 3.1416 \cdot (1.5E-6F + 1.2E-6F)}

Next Step Prepare to Evaluate

∴

f t = \frac{0.0017}{2 \cdot 3.1416 \cdot (1.5E-6 + 1.2E-6)}

Next Step Evaluate

∴

f t = 101.387593377059Hz

LAST Step Rounding Answer

∴

f t = 101.3876Hz

Transition Frequency of BJT Formula Elements

Variables

Constants

Transition Frequency

The Transition Frequency associated with the transition (1 to 2 or 2 to 1) between two different vibrational levels.

Symbol: f_t

Measurement: FrequencyUnit: Hz

Note: Value should be greater than 0.

Formulas to find Transition Frequency

Transconductance

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.

Symbol: G_m

Measurement: Electric ConductanceUnit: mS

Note: Value can be positive or negative.

Formulas to find Transconductance

Emitter-Base Capacitance

Emitter-base capacitance is the capacitance between the emitter and the base.

Symbol: C_eb

Measurement: CapacitanceUnit: μF

Note: Value can be positive or negative.

Formulas to find Emitter-Base Capacitance

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

Archimedes' constant

Archimedes' constant is a mathematical constant that represents the ratio of the circumference of a circle to its diameter.

Symbol: π

Value: 3.14159265358979323846264338327950288

Other formulas in Internal Capacitive Effects and High Frequency Model category

Go Common-Base Current Gain

α = \frac{β}{β + 1}

Go Intrinsic Gain of BJT

A o = \frac{V A}{V t}

Go Total Power Dissipated in BJT

P = V CE \cdot I c + V BE \cdot I B

Go Common Mode Rejection Ratio

CMRR = 20 \cdot \log 10 (\frac{A d}{A cm})

How to Evaluate Transition Frequency of BJT?

Transition Frequency of BJT evaluator uses Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance)) to evaluate 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 evaluate Transition Frequency of BJT using this online evaluator? To use this online evaluator 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.

FAQs on Transition Frequency of BJT

What is the formula to find Transition Frequency of BJT?

The formula of Transition Frequency of BJT is expressed as Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance)). Here is an example- 101.3876 = 0.00172/(2*pi*(1.5E-06+1.2E-06)).

How to calculate Transition Frequency of BJT?

With Transconductance (G_m), Emitter-Base Capacitance (C_eb) & Collector-Base Junction Capacitance (C_cb) we can find Transition Frequency of BJT using the formula - Transition Frequency = Transconductance/(2*pi*(Emitter-Base Capacitance+Collector-Base Junction Capacitance)). This formula also uses Archimedes' constant .

Can the Transition Frequency of BJT be negative?

Yes, the Transition Frequency of BJT, measured in Frequency can be negative.

Which unit is used to measure Transition Frequency of BJT?

Transition Frequency of BJT is usually measured using the Hertz[Hz] for Frequency. Petahertz[Hz], Terahertz[Hz], Gigahertz[Hz] are the few other units in which Transition Frequency of BJT can be measured.

Let Others Know

✖

Facebook

Twitter

Copied!

: Value
: Unit