Voltage Drop in Diode: Exploring Causes & Amplifier Doubts

[sudar_dhoni]

the depletion region is resposible for voltage drop
all that is fine
but in forward bias there is no depletion region hence there can be no voltage drop
but it is mentioned in my book that the voltage will drop by .7 volt
how come this can happen


also i have many doubts in transistor amplifiers
waiting for reply's

 

[Bob S]

The forward voltage drop in a diode is given in thread:
https://www.physicsforums.com/showthread.php?t=356310
It is a function of both current and temperature.
Bob S

 

[charng]

I can provide some insights into the voltage drop in diodes and address your doubts about transistor amplifiers.

Firstly, it is true that the depletion region in a diode is responsible for the voltage drop. The depletion region is a region in the diode where there are no free charge carriers, creating a potential barrier that results in a voltage drop. In a forward bias, the depletion region is reduced, allowing current to flow through the diode. However, even in forward bias, there is still a small depletion region present, leading to a voltage drop of approximately 0.7 volts.

Now, you may wonder how this voltage drop can occur in forward bias when there is no depletion region. This is because the depletion region is not completely eliminated in forward bias, but rather it becomes narrower. This narrowing still creates a potential barrier and results in a voltage drop.

Moving on to your doubts about transistor amplifiers, it is normal to have questions and doubts when learning about a complex topic like this. Transistor amplifiers are electronic circuits that use transistors to amplify weak signals. There are different types of transistor amplifiers, such as common emitter, common collector, and common base.

Each type has its own characteristics and performance, and it can be confusing to understand them all at once. My suggestion would be to start by understanding the basic principles and components of a transistor amplifier, such as the transistor itself, resistors, and capacitors. Then, you can gradually build on this knowledge and learn about the different types of transistor amplifiers and their applications.

Additionally, it can be helpful to consult reliable sources, such as textbooks or online tutorials, and to seek guidance from experienced individuals in the field. Don't be afraid to ask questions and seek clarification when needed.

In summary, the voltage drop in a diode is caused by the depletion region, which is not completely eliminated in forward bias. As for your doubts about transistor amplifiers, it is important to understand the basic principles and seek guidance from reliable sources. Keep exploring and learning, and your doubts will gradually be resolved.