Base Transit Time Calculator

✖Emitter collector delay time is defined as the transit time across the base-collector depletion region or space.ⓘ Emitter Collector Delay Time [τ_ec]			+10% -10%
✖Base Collector Delay Time refers to the additional time taken by the signal to propagate through space charged region of base collector junction.ⓘ Base Collector Delay Time [τ_scr]			+10% -10%
✖Collector charging time refers to the time taken for the minority carriers in the base region of a BJT to be swept out of the collector region after the transistor is turned off.ⓘ Collector Charging Time [τ_c]			+10% -10%
✖Emitter charging time is defined as drift in the motion of the charged particles induced by a field when you forward bias the emitter junction you get a large diffusion.ⓘ Emitter Charging Time [τ_e]			+10% -10%

✖Base transit time is the average time the minority carriers need to traverse the quasi-neutral region in the base.ⓘ Base Transit Time [τ_b]

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Formula

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Base Transit Time

Formula

`"τ"_{"b"} = "τ"_{"ec"}-("τ"_{"scr"}+"τ"_{"c"}+"τ"_{"e"})`

Example

`"10.1μs"="5295μs"-("5.5μs"+"6.4μs"+"5273μs")`

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Base Transit Time Solution

STEP 0: Pre-Calculation Summary

Formula Used

Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time)
τ_b = τ_ec-(τ_scr+τ_c+τ_e)
This formula uses 5 Variables

Variables Used

Base Transit Time - (Measured in Second) - Base transit time is the average time the minority carriers need to traverse the quasi-neutral region in the base.
Emitter Collector Delay Time - (Measured in Second) - Emitter collector delay time is defined as the transit time across the base-collector depletion region or space.
Base Collector Delay Time - (Measured in Second) - Base Collector Delay Time refers to the additional time taken by the signal to propagate through space charged region of base collector junction.
Collector Charging Time - (Measured in Second) - Collector charging time refers to the time taken for the minority carriers in the base region of a BJT to be swept out of the collector region after the transistor is turned off.
Emitter Charging Time - (Measured in Second) - Emitter charging time is defined as drift in the motion of the charged particles induced by a field when you forward bias the emitter junction you get a large diffusion.

STEP 1: Convert Input(s) to Base Unit

Emitter Collector Delay Time: 5295 Microsecond --> 0.005295 Second (Check conversion here)
Base Collector Delay Time: 5.5 Microsecond --> 5.5E-06 Second (Check conversion here)
Collector Charging Time: 6.4 Microsecond --> 6.4E-06 Second (Check conversion here)
Emitter Charging Time: 5273 Microsecond --> 0.005273 Second (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

τ_b = τ_ec-(τ_scr+τ_c+τ_e) --> 0.005295-(5.5E-06+6.4E-06+0.005273)

Evaluating ... ...

τ_b = 1.01000000000007E-05

STEP 3: Convert Result to Output's Unit

1.01000000000007E-05 Second -->10.1000000000007 Microsecond (Check conversion here)

FINAL ANSWER

10.1000000000007 ≈ 10.1 Microsecond <-- Base Transit Time

(Calculation completed in 00.020 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

Base Transit Time Formula

Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time)
τ_b = τ_ec-(τ_scr+τ_c+τ_e)

What is Frequency range of microwave?

Microwave frequencies range between 109 Hz (1 GHz) to 1000 GHz with respective wavelengths of 30 to 0.03 cm. Within this spectral domain are a number of communication systems applications that are important in both the military and civilian sectors.

How to Calculate Base Transit Time?

Base Transit Time calculator uses Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time) to calculate the Base Transit Time, The Base Transit Time formula is defined as the average time the minority carriers need to traverse the quasi-neutral region in the base. Base Transit Time is denoted by τ_b symbol.

How to calculate Base Transit Time using this online calculator? To use this online calculator for Base Transit Time, enter Emitter Collector Delay Time (τ_ec), Base Collector Delay Time (τ_scr), Collector Charging Time (τ_c) & Emitter Charging Time (τ_e) and hit the calculate button. Here is how the Base Transit Time calculation can be explained with given input values -> 1E+7 = 0.005295-(5.5E-06+6.4E-06+0.005273).

FAQ

What is Base Transit Time?

The Base Transit Time formula is defined as the average time the minority carriers need to traverse the quasi-neutral region in the base and is represented as τ_b = τ_ec-(τ_scr+τ_c+τ_e) or Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time). Emitter collector delay time is defined as the transit time across the base-collector depletion region or space, Base Collector Delay Time refers to the additional time taken by the signal to propagate through space charged region of base collector junction, Collector charging time refers to the time taken for the minority carriers in the base region of a BJT to be swept out of the collector region after the transistor is turned off & Emitter charging time is defined as drift in the motion of the charged particles induced by a field when you forward bias the emitter junction you get a large diffusion.

How to calculate Base Transit Time?

The Base Transit Time formula is defined as the average time the minority carriers need to traverse the quasi-neutral region in the base is calculated using Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time). To calculate Base Transit Time, you need Emitter Collector Delay Time (τ_ec), Base Collector Delay Time (τ_scr), Collector Charging Time (τ_c) & Emitter Charging Time (τ_e). With our tool, you need to enter the respective value for Emitter Collector Delay Time, Base Collector Delay Time, Collector Charging Time & Emitter Charging Time 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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