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Old 4th January 2011, 04:33 AM   #1
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Default 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
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Old 4th January 2011, 07:50 AM   #2
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Emitter to Base resistors for output CFP pair are missing.

Last edited by Workhorse; 4th January 2011 at 08:10 AM.
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Old 4th January 2011, 08:08 AM   #3
WuYit is offline WuYit  Sweden
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Hi Kanwar,
what does CFB stand for? Cipher feedback?
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Old 4th January 2011, 08:10 AM   #4
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Quote:
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Hi Kanwar,
what does CFB stand for? Cipher feedback?
CFP=Compound Feedback Pair
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Old 4th January 2011, 08:32 AM   #5
WuYit is offline WuYit  Sweden
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Can we agree on Complementary Factor Pro?
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Old 4th January 2011, 08:35 AM   #6
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Quote:
Originally Posted by WuYit View Post
Can we agree on Complementary Factor Pro?
Why not Common Fire Place
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Old 4th January 2011, 09:20 AM   #7
AndrewT is offline AndrewT  Scotland
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complementary follower pair
or
complementary feedback pair?
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regards Andrew T.
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Old 4th January 2011, 11:53 AM   #8
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Quote:
Originally Posted by Workhorse View Post
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?

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complementary feedback pair
Complimentary Feedback Pair, as per AndrewT, or Sziklai Pair, thanks.
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Old 4th January 2011, 12:40 PM   #9
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Quote:
Originally Posted by jkuetemann View Post
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.
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Old 4th January 2011, 12:48 PM   #10
BV is offline BV  Slovakia
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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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