- #1
CKaiL
- 38
- 1
Homework Statement
Given the following formula for saturation current
Homework Equations
The Attempt at a Solution
I am able to find the value for Dn , q , WB , ni and N AB except for the A(cross sectional area)
How to find the density of collector saturation current?
- Thread starter CKaiL
- Start date
In summary, the problem involves finding the collector saturation current density given specific values for emitter and base doping, diffusion coefficients, diffusion lengths, and neutral region width. However, the computation cannot be completed without knowing the cross sectional area, which can be arbitrarily chosen as 1 square meter.
Given the following formula for saturation current
I am able to find the value for Dn , q , WB , ni and N AB except for the A(cross sectional area)
- #2
- 18,817
- 13,663
So what is your question?
- #3
CKaiL
- 38
- 1
Find the collector saturation current density since I have the following
Doping in the emitter, NDE = 1018 cm-3,
Doping in the base, NAB = 2×1016 cm-3,
Diffusion coefficient of holes in the emitter, Dp = 1 cm2/s,
Diffusion coefficient of electrons in the base, Dn = 10 cm2/s,
Diffusion length of holes in the emitter, Lp = 0.300 μm,
Diffusion length of electrons in the base, Ln = 20 μm,
Width of the neutral region in the base, wB = 1 μm.
Doping in the emitter, NDE = 1018 cm-3,
Doping in the base, NAB = 2×1016 cm-3,
Diffusion coefficient of holes in the emitter, Dp = 1 cm2/s,
Diffusion coefficient of electrons in the base, Dn = 10 cm2/s,
Diffusion length of holes in the emitter, Lp = 0.300 μm,
Diffusion length of electrons in the base, Ln = 20 μm,
Width of the neutral region in the base, wB = 1 μm.
- #4
- 18,817
- 13,663
You have simply restated exactly the same problem but with specific values. You don't know the area so you can't finish the computation, right? Would you like for us to make up a cross section for you? Ok, use 1 square meter.
1. What is collector saturation current?
Collector saturation current is the maximum current that can flow through the collector of a transistor when it is fully saturated, meaning that the collector-emitter voltage is at its minimum value and the transistor is conducting as much as it possibly can.
2. How is collector saturation current related to transistor operation?
Collector saturation current is an important parameter in the operation of a transistor, as it determines the maximum amount of current that can flow through the collector and therefore affects the overall performance of the transistor.
3. What factors affect the density of collector saturation current?
The density of collector saturation current is affected by factors such as the doping level of the collector, the temperature, and the size and type of the transistor.
4. How can I calculate the density of collector saturation current?
The density of collector saturation current can be calculated using the equation: JSC = qnDC, where JSC is the saturation current density, q is the elementary charge, n is the doping level of the collector, and DC is the diffusion constant.
5. Why is it important to know the density of collector saturation current?
Knowing the density of collector saturation current is important for accurately designing and analyzing transistor circuits, as it affects the overall performance and efficiency of the transistor. It also helps in predicting the saturation behavior of the transistor under different operating conditions.
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