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Old 12th July 2005, 09:48 PM   #1
Pafi is offline Pafi  Hungary
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Question Feedback? Vote!

What is your opinion? Is there any feedback in this circuit, or not? Please answer only yes/no!

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Old 12th July 2005, 09:52 PM   #2
SY is offline SY  United States
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Of course there is. Distortion and source Z are reduced in proportion to gain in common emitter.
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Old 12th July 2005, 10:13 PM   #3
Pafi is offline Pafi  Hungary
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Thanks, although I asked only yes/no answer.

Then next question: Is it neccessary to lead back every circuit to common emitter configuration, or is it allowed to calculate simple way? (I think it is relevant the statement by Einstein: Everything should be made as simple as possible, but not one bit simpler.)
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Old 12th July 2005, 10:56 PM   #4
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1st:yes
2nd:?
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Old 12th July 2005, 11:11 PM   #5
Jorge is offline Jorge  Brazil
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First: yes

Second: can you state it more clearly?
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Old 13th July 2005, 08:57 AM   #6
Pafi is offline Pafi  Hungary
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I try, but I don't know the english technical terminations (or what the heck).

A transistor can be described as 2 gate(?). For example: 1'st gate: base-emitter, 2'nd gate: collector-emitter. There are network equations, for example:

u1=h11*i1+h12*u2
i2=h21*i1+h22*u2

This is the most common, but not the only way! It can be done with common base or common collector too! My 2'nd question: is there any reason to universally prefer one of these, instead of stereotype? I think there is a reason, why is it useful to use the appropiate one, when circuit can be analized simpler with it.

To be continued, actual example come soon!
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Old 13th July 2005, 09:04 AM   #7
Bricolo is offline Bricolo  France
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Yes. There's 100% local feedback in this topology.

With zero beefback, neither local nor global, the gain would be infinite
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Old 13th July 2005, 10:26 AM   #8
PMA is offline PMA  Europe
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Default Re: Feedback? Vote!

Quote:
Originally posted by Pafi
What is your opinion? Is there any feedback in this circuit, or not? Please answer only yes/no!

Click the image to open in full size.
Yes - 100% voltage feedback.
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Old 13th July 2005, 10:40 AM   #9
Cortez is offline Cortez  Hungary
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voltage ?
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Old 13th July 2005, 11:01 AM   #10
PMA is offline PMA  Europe
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Yes, a "textbook" example of the voltage feedback.
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