Calculating Re and Ib for Transistor Saturation Region

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In summary, to find Re for a transistor to work in saturation region, the following steps should be followed: 1. Determine Vre by subtracting 0.7 from the base voltage (Eb). 2. Calculate Ic1 from Eb using the equation Eb - 0.7 = Ic1*Re. 3. Use Kirchoff's laws to find Vce from the equations Vcc - Ic(Rc+Re) - Vce = 0 and V1 - Ic(R1+Re) - Vce = 0. 4. Add Ic1 to the value of Ic found in step 3. 5. Use the calculated value of Ic to find Re
  • #1
kliker
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[PLAIN]http://img256.imageshack.us/img256/2164/transistor.jpg

i should find Re so that transistor works in saturation region

also i should find Ib in saturation region

Rc=2kΩ , R1=2kΩ , EB=5V, Vcc=10V, V1=3V, β=100

im really confused with R1 and V1 i don't know what is their function

i know that in saturation region Vce = 0

also from the diagram i can see that

Eb - 0.7 = Vre so Vre = 4.3 Volts

Ie = Vre/Re

if we assume that Ie = Ic

then

Ic = Vre/Re

Ic is Vcc/Rc = 10/2000 = 5mA

so Re should be Vre/5mA = 4.3/5*10^-3 = 0.86 KΩ

but does this Re stand for saturation region?
 
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  • #2
Your calculation for Ie doesn't take into account current flowing due to Vcc or V1 in the resistor Re. Use Kirchoff's laws.
 
  • #3
we have

Eb - 0.7 = Ic1*Re we find Ic1 from Eb

Vcc - Ic(Rc+Re) - Vce = 0
V1 - Ic(R1+Re) - Vce = 0

we find Vce from these two statements and Ic which I will have to add Ic1?

and how can this help me solve the problem?
 

1. What is a transistor and what does it do?

A transistor is a semiconductor device that is used to amplify or switch electronic signals. It acts as a switch or an amplifier by controlling the flow of electrons through a circuit.

2. What is the purpose of solving a transistor problem?

The purpose of solving a transistor problem is to ensure the proper functioning of electronic devices that use transistors. By solving the problem, we can identify any faulty transistors and replace them to keep the device working efficiently.

3. What are some common issues with transistors?

Some common issues with transistors include short circuits, open circuits, and overheating. These issues can be caused by manufacturing defects, excessive voltage or current, or physical damage.

4. How can I troubleshoot a transistor problem?

To troubleshoot a transistor problem, you can use a multimeter to test for continuity and voltage. You can also visually inspect the transistor for any physical damage. If the problem persists, you may need to replace the transistor.

5. Can transistors be repaired?

In most cases, transistors cannot be repaired. If a transistor is faulty, it will need to be replaced with a new one. However, some transistors may be able to be fixed by re-soldering or replacing damaged components.

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