My Amplifier Design - Comments?

jkuetemann · 4th January 2011, 04:33 AM

I'm new to this forum, be gentle.

Attached is a design I'm currently working on, in simulation at the moment. I have built a number of amps in the past, each building up on things I've learned along the way. This is the first time I have really tried to simulate first, using Multisim 10.1, but I don't have many of the devices I'd like to use in the database. I'm curious to get some input regarding 'best fit' devices for this design and what ones to use during simulation. The devices listed on the schematic aren't likely the final device choices. Also, the design will also get at least another pair of outputs.

This is one I'm looking for any constructive critique for tweaks, layout tips and so forth on. Thanks.

Amplifier-CE.pdf

Workhorse · 08:10 AM

Emitter to Base resistors for output CFP pair are missing.

WuYit · 4th January 2011, 08:08 AM

Hi Kanwar,
what does CFB stand for? Cipher feedback?

Workhorse · 4th January 2011, 08:10 AM

Quote:

Originally Posted by WuYit

Hi Kanwar,
what does CFB stand for? Cipher feedback?

CFP=Compound Feedback Pair

WuYit · 4th January 2011, 08:32 AM

Can we agree on Complementary Factor Pro?

Workhorse · 4th January 2011, 08:35 AM

Quote:

Originally Posted by WuYit

Can we agree on Complementary Factor Pro?

Why not Common Fire Place

AndrewT · 4th January 2011, 09:20 AM

complementary follower pair
or
complementary feedback pair?

jkuetemann · 4th January 2011, 11:53 AM

Quote:

Originally Posted by Workhorse

Emitter to Base resistors for output CFP pair are missing.

I've seen CFP's arranged a few different ways. I'm not sure where you are suggesting to place these resistors, base and emitter of which transistors? Are you suggesting the emitter of Q5 and Q16 to their respective rails? Q17, Q5, and Q6 are the upper 'pair', and Q18, Q16 and Q14 the lower 'pair'. I chose to make my outputs darlington pairs mainly because I've never tried it and it actually seems more stable in simulation (of course the 'real world' hasn't had a kick at the can yet). A recommended value and placement?

Quote:

Originally Posted by AndrewT

complementary feedback pair

Complimentary Feedback Pair, as per AndrewT, or Sziklai Pair, thanks.

Workhorse · 4th January 2011, 12:40 PM

Quote:

Originally Posted by jkuetemann

I've seen CFP's arranged a few different ways. I'm not sure where you are suggesting to place these resistors, base and emitter of which transistors? Are you suggesting the emitter of Q5 and Q16 to their respective rails? Q17, Q5, and Q6 are the upper 'pair', and Q18, Q16 and Q14 the lower 'pair'. I chose to make my outputs darlington pairs mainly because I've never tried it and it actually seems more stable in simulation (of course the 'real world' hasn't had a kick at the can yet).

Base to rail junction of output transistors, 22R is good starting point, these resistor helps in turning OFF the transistors fast during high frequency signals and eliminating cross-conduction effect.

BV · 12:53 PM

Missing emitor resistors in output, thermal runaway very likely. R14 and R17 are in wrong place, without function.
Or You have to connect R13(R33) not to output, but to colectors of Q5, Q6 (Q16,Q14). And you can expect local instability with this "triples".

4th January 2011, 04:33 AM	#1
jkuetemann diyAudio Member Join Date: Dec 2010 Location: Paris, Ontario	My Amplifier Design - Comments? I'm new to this forum, be gentle. Attached is a design I'm currently working on, in simulation at the moment. I have built a number of amps in the past, each building up on things I've learned along the way. This is the first time I have really tried to simulate first, using Multisim 10.1, but I don't have many of the devices I'd like to use in the database. I'm curious to get some input regarding 'best fit' devices for this design and what ones to use during simulation. The devices listed on the schematic aren't likely the final device choices. Also, the design will also get at least another pair of outputs. This is one I'm looking for any constructive critique for tweaks, layout tips and so forth on. Thanks. Amplifier-CE.pdf

4th January 2011, 07:50 AM	#2
Workhorse diyAudio Member Join Date: Dec 2004	Emitter to Base resistors for output CFP pair are missing. __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance Last edited by Workhorse; 4th January 2011 at 08:10 AM.

4th January 2011, 09:20 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	complementary follower pair or complementary feedback pair? __________________ regards Andrew T.

4th January 2011, 12:48 PM	#10
BV diyAudio Member Join Date: Sep 2005 Location: Trnava, Slovakia	Missing emitor resistors in output, thermal runaway very likely. R14 and R17 are in wrong place, without function. Or You have to connect R13(R33) not to output, but to colectors of Q5, Q6 (Q16,Q14). And you can expect local instability with this "triples". Last edited by BV; 4th January 2011 at 12:53 PM.

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4th January 2011, 08:08 AM	#3
WuYit Banned Join Date: Oct 2010	Hi Kanwar, what does CFB stand for? Cipher feedback?

4th January 2011, 08:32 AM	#5
WuYit Banned Join Date: Oct 2010	Can we agree on Complementary Factor Pro?

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