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Base Transit Time Formula

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Base transit time is the average time the minority carriers need to traverse the quasi-neutral region in the base. Check FAQs
τb=τec-(τscr+τc+τe)
τb - Base Transit Time?τec - Emitter Collector Delay Time?τscr - Base Collector Delay Time?τc - Collector Charging Time?τe - Emitter Charging Time?

Base Transit Time Example

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With units
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Here is how the Base Transit Time equation looks like with Values.

Here is how the Base Transit Time equation looks like with Units.

Here is how the Base Transit Time equation looks like.

10.1Edit=5295Edit-(5.5Edit+6.4Edit+5273Edit)
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HomeIcon Home » Category Engineering » Category Electronics » Category Microwave Theory » fx Base Transit Time

Base Transit Time Solution

Follow our step by step solution on how to calculate Base Transit Time?

FIRST Step Consider the formula
τb=τec-(τscr+τc+τe)
Next Step Substitute values of Variables
∴ τb=5295μs-(5.5μs+6.4μs+5273μs)
Next Step Convert Units
∴ τb=0.0053s-(5.5E-6s+6.4E-6s+0.0053s)
Next Step Prepare to Evaluate
∴ τb=0.0053-(5.5E-6+6.4E-6+0.0053)
Next Step Evaluate
∴τb=1.01000000000007E-05s
Next Step Convert to Output's Unit
∴τb=10.1000000000007μs
LAST Step Rounding Answer
∴τb=10.1μs

Base Transit Time Formula Elements

Variables
Base Transit Time
Base transit time is the average time the minority carriers need to traverse the quasi-neutral region in the base.
Symbol: τb
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Base Transit TimeOpen Variable
Emitter Collector Delay Time
Emitter collector delay time is defined as the transit time across the base-collector depletion region or space.
Symbol: τec
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Emitter Collector Delay TimeOpen Variable
Base Collector Delay Time
Base Collector Delay Time refers to the additional time taken by the signal to propagate through space charged region of base collector junction.
Symbol: τscr
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Base Collector Delay TimeOpen Variable
Collector Charging Time
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.
Symbol: τc
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Collector Charging TimeOpen Variable
Emitter Charging Time
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.
Symbol: τe
Measurement: TimeUnit: μs
Note: Value should be greater than 0.
Formulas to find Emitter Charging TimeOpen Variable

Other formulas in BJT Microwave Devices category

​Go Cut-off Frequency of Microwave
fco=12⋅π⋅τec
​Go Base Collector Delay Time
τscr=τec-(τc+τb+τe)
​Go Collector Charging Time
τc=τec-(τscr+τb+τe)
​Go Maximum Frequency of Oscillations
fm=fT8⋅π⋅Rb⋅Cc

How to Evaluate Base Transit Time?

Base Transit Time evaluator uses Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time) to evaluate 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 τb symbol.

How to evaluate Base Transit Time using this online evaluator? To use this online evaluator for Base Transit Time, enter Emitter Collector Delay Time (τec), Base Collector Delay Time (τscr), Collector Charging Time (τc) & Emitter Charging Time (τe) and hit the calculate button.

FAQs on Base Transit Time

What is the formula to find Base Transit Time?
The formula of Base Transit Time is expressed as Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time). Here is an example- 1E+7 = 0.005295-(5.5E-06+6.4E-06+0.005273).
How to calculate Base Transit Time?
With Emitter Collector Delay Time (τec), Base Collector Delay Time (τscr), Collector Charging Time (τc) & Emitter Charging Time (τe) we can find Base Transit Time using the formula - Base Transit Time = Emitter Collector Delay Time-(Base Collector Delay Time+Collector Charging Time+Emitter Charging Time).
Can the Base Transit Time be negative?
No, the Base Transit Time, measured in Time cannot be negative.
Which unit is used to measure Base Transit Time?
Base Transit Time is usually measured using the Microsecond[μs] for Time. Second[μs], Millisecond[μs], Nanosecond[μs] are the few other units in which Base Transit Time can be measured.
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