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Basics of Common Emitter amplifier.

by shayaan_musta
Tags: amplifier, basics, common, emitter
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Averagesupernova
#37
Dec2-11, 10:01 AM
P: 2,526
Shayaan, based on my experience I would say after you have read this thread you should know the answers to these things. Mostly, the resistors are there to set up the proper Q-point. A coupling capacitor is there for the obvious, to couple 2 stages together. The emitter bypass I am not going to tell you specifically since it has been covered enough times in this thread so it should be obvious. Your answers in your first post are mostly correct although they are pretty generic. If I were an instructor asking those three questions and those were the answers I got you would not fail, but you certainly would not get a top grade. Now forgive me if you are not in school and these are just questions. However, if you are in school, the way you have asked these questions tells me that you have not been paying attention to the transsitor theory taught up to this point or you are going to a school that is doing a poor job of teaching it. My 2 cents.
technician
#38
Dec2-11, 10:45 AM
P: 1,506
I agree with averageSupernova. There is more than enough information here to be able to design and build a simple amplifier.
Have a go at making one and see what happens by experimenting. Things will go wrong but that is the best way to learn.
sophiecentaur
#39
Dec2-11, 12:12 PM
Sci Advisor
Thanks
PF Gold
sophiecentaur's Avatar
P: 12,157
You have asked what is the purpose of various components. Draw the circuit leaving them out (short or open circuit as appropriate) then work out what will happen to the various voltages around the circuit.
shayaan_musta
#40
Dec2-11, 01:03 PM
P: 184
Quote Quote by Averagesupernova View Post
Shayaan, based on my experience I would say after you have read this thread you should know the answers to these things. Mostly, the resistors are there to set up the proper Q-point. A coupling capacitor is there for the obvious, to couple 2 stages together. The emitter bypass I am not going to tell you specifically since it has been covered enough times in this thread so it should be obvious. Your answers in your first post are mostly correct although they are pretty generic. If I were an instructor asking those three questions and those were the answers I got you would not fail, but you certainly would not get a top grade. Now forgive me if you are not in school and these are just questions. However, if you are in school, the way you have asked these questions tells me that you have not been paying attention to the transsitor theory taught up to this point or you are going to a school that is doing a poor job of teaching it. My 2 cents.
As you said that my answers are right. I think so. But when I asked it to an experienced electronic engineer(33 years in electronic engineering) he said me nothing is right and ask me to go and refer to book. Then I got confused and move to physics forums.

Thanks.
skeptic2
#41
Dec2-11, 01:25 PM
P: 1,810
It might be worth mentioning that this is not the only type of common emitter amplifier. In fact it could be argued that this isn't a true common emitter because the emitter is not really common to both the input and output sides.

Attached is an example of another common emitter arrangement which may have some advantages over the other configuration depending on intended application. They are:

1. It tends to have higher gain than the version with an emitter resistor
2. It is more immune from power supply noise than the other version.
3. At RF this is the preferred version as it minimizes the potential for oscillation.
Attached Thumbnails
CE Amp.gif  


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