Feedback? Vote!

Pafi · 12th July 2005, 09:48 PM

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

SY · 12th July 2005, 09:52 PM

Of course there is. Distortion and source Z are reduced in proportion to gain in common emitter.

Pafi · 12th July 2005, 10:13 PM

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.)

darkfenriz · 12th July 2005, 10:56 PM

1st:yes
2nd:?

Jorge · 12th July 2005, 11:11 PM

First: yes

Second: can you state it more clearly?

Pafi · 13th July 2005, 08:57 AM

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!

Bricolo · 13th July 2005, 09:04 AM

Yes. There's 100% local feedback in this topology.

With zero beefback, neither local nor global, the gain would be infinite

PMA · 13th July 2005, 10:26 AM

Quote:

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

Yes - 100% voltage feedback.

Cortez · 13th July 2005, 10:40 AM

voltage ?

PMA · 13th July 2005, 11:01 AM

Yes, a "textbook" example of the voltage feedback.

12th July 2005, 09:48 PM	#1
Pafi Sin Bin Join Date: May 2004 Location: Budapest	Feedback? Vote! What is your opinion? Is there any feedback in this circuit, or not? Please answer only yes/no!

12th July 2005, 09:52 PM	#2
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Of course there is. Distortion and source Z are reduced in proportion to gain in common emitter. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

13th July 2005, 09:04 AM	#7
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	Yes. There's 100% local feedback in this topology. With zero beefback, neither local nor global, the gain would be infinite __________________ Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease

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12th July 2005, 10:13 PM	#3
Pafi Sin Bin Join Date: May 2004 Location: Budapest	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.)

12th July 2005, 10:56 PM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	1st:yes 2nd:?

12th July 2005, 11:11 PM	#5
Jorge diyAudio Member Join Date: Apr 2001 Location: Brazil	First: yes Second: can you state it more clearly?

13th July 2005, 08:57 AM	#6
Pafi Sin Bin Join Date: May 2004 Location: Budapest	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=h11i1+h12u2 i2=h21i1+h22u2 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!

13th July 2005, 10:40 AM	#9
Cortez diyAudio Member Join Date: Dec 2002 Location: Hungary	voltage ?

13th July 2005, 11:01 AM	#10
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	Yes, a "textbook" example of the voltage feedback.

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