Emitter Efficiency Solution

STEP 0: Pre-Calculation Summary
Formula Used
Emitter Efficiency = Electron Diffusion Current/(Electron Diffusion Current+Hole Diffusion Current)
ηE = InE/(InE+Ih)
This formula uses 3 Variables
Variables Used
Emitter Efficiency - Emitter Efficiency is defined as the ratio of the electron current in the emitter, to the sum of the electron and hole current diffusing across the base-emitter junction.
Electron Diffusion Current - (Measured in Ampere) - Electron Diffusion Current is a current in a semiconductor caused by the diffusion of charge carriers like electrons.
Hole Diffusion Current - (Measured in Ampere) - Hole Diffusion Current is the current that flows in a semiconductor and it is caused by the diffusion of charge carriers like holes.
STEP 1: Convert Input(s) to Base Unit
Electron Diffusion Current: 25 Milliampere --> 0.025 Ampere (Check conversion here)
Hole Diffusion Current: 26 Milliampere --> 0.026 Ampere (Check conversion here)
STEP 2: Evaluate Formula
Substituting Input Values in Formula
ηE = InE/(InE+Ih) --> 0.025/(0.025+0.026)
Evaluating ... ...
ηE = 0.490196078431373
STEP 3: Convert Result to Output's Unit
0.490196078431373 --> No Conversion Required
FINAL ANSWER
0.490196078431373 0.490196 <-- Emitter Efficiency
(Calculation completed in 00.004 seconds)

Credits

Created by Akshada Kulkarni
National Institute of Information Technology (NIIT), Neemrana
Akshada Kulkarni has created this Calculator and 500+ more calculators!
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13 Transistor Operating Parameters Calculators

Drain Current
Go Drain Current = Mobility of Electron*Gate Oxide Capacitance*(Gate Junction Width/Gate Length)*(Gate Source Voltage- Threshold Voltage)*Drain Source Saturation Voltage
Emitter Efficiency
Go Emitter Efficiency = Electron Diffusion Current/(Electron Diffusion Current+Hole Diffusion Current)
Base Current using Current Amplification Factor
Go Base Current = Emitter Current*(1-Current Amplification Factor)-Collector Base Leakage Current
Collector-Emitter Voltage
Go Collector Emitter Voltage = Common Collector Voltage-Collector Current*Collector Resistance
Collector to Emitter Leakage Current
Go Collector Emitter Leakage Current = (Base Transport Factor+1)*Collector Base Leakage Current
Current Amplification Factor using Base Transport Factor
Go Current Amplification Factor = Base Transport Factor/(Base Transport Factor+1)
Collector Current using Current Amplification Factor
Go Collector Current = Current Amplification Factor*Emitter Current
Current Amplification Factor
Go Current Amplification Factor = Collector Current/Emitter Current
Collector Current using Base Transport Factor
Go Collector Current = Base Transport Factor*Base Current
Base Transport Factor
Go Base Transport Factor = Collector Current/Base Current
Emitter Current
Go Emitter Current = Base Current+Collector Current
Common Collector Current Gain
Go Common Collector Current Gain = Base Transport Factor+1
Dynamic Emitter Resistance
Go Dynamic Emitter Resistance = 0.026/Emitter Current

Emitter Efficiency Formula

Emitter Efficiency = Electron Diffusion Current/(Electron Diffusion Current+Hole Diffusion Current)
ηE = InE/(InE+Ih)

What increases emitter injection efficiency?

The injection efficiency of the transistor emitter is controlled by the ratio of emitter doping concentration to the base doping concentration. As this ratio increases, the injection efficiency increases.

At high currents, there is a high concentration of injected carriers in base region, thereby increasing its conductivity. The emitter efficiency and therefore transistor beta decreases due to this. However this effect is not always bad. We make use of it in automatic gain control circuit.

How to Calculate Emitter Efficiency?

Emitter Efficiency calculator uses Emitter Efficiency = Electron Diffusion Current/(Electron Diffusion Current+Hole Diffusion Current) to calculate the Emitter Efficiency, The emitter efficiency is the ratio of carriers injected into the base from the emitter (forward minority carrier injection) to total carriers injected from the base into the emitter (reverse minority carrier injection) plus forward injection. Emitter Efficiency is denoted by ηE symbol.

How to calculate Emitter Efficiency using this online calculator? To use this online calculator for Emitter Efficiency, enter Electron Diffusion Current (InE) & Hole Diffusion Current (Ih) and hit the calculate button. Here is how the Emitter Efficiency calculation can be explained with given input values -> 0.490196 = 0.025/(0.025+0.026).

FAQ

What is Emitter Efficiency?
The emitter efficiency is the ratio of carriers injected into the base from the emitter (forward minority carrier injection) to total carriers injected from the base into the emitter (reverse minority carrier injection) plus forward injection and is represented as ηE = InE/(InE+Ih) or Emitter Efficiency = Electron Diffusion Current/(Electron Diffusion Current+Hole Diffusion Current). Electron Diffusion Current is a current in a semiconductor caused by the diffusion of charge carriers like electrons & Hole Diffusion Current is the current that flows in a semiconductor and it is caused by the diffusion of charge carriers like holes.
How to calculate Emitter Efficiency?
The emitter efficiency is the ratio of carriers injected into the base from the emitter (forward minority carrier injection) to total carriers injected from the base into the emitter (reverse minority carrier injection) plus forward injection is calculated using Emitter Efficiency = Electron Diffusion Current/(Electron Diffusion Current+Hole Diffusion Current). To calculate Emitter Efficiency, you need Electron Diffusion Current (InE) & Hole Diffusion Current (Ih). With our tool, you need to enter the respective value for Electron Diffusion Current & Hole Diffusion Current 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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