Evolve Non Global Feedback Distortion Cancellation Power Amplifier - diyAudio
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Old 8th December 2009, 04:44 PM   #1
EUVL is offline EUVL  Europe
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Default Evolve Non Global Feedback Distortion Cancellation Power Amplifier

A while back, someone brought up this circuit :

Distortion removal circuit

I thought it was very clever and interesting. With my limited knowledge of Japanese and amplifier design, and with the help of Babbel Fish, I put together a not-too-perfect translation of the article, and hope that it will stimulate some discussion.

If a native speaker spots any mistakes, please feel free to correct. And I hope the the original author has no objections to me posting it here.




Patrick
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Old 8th December 2009, 04:46 PM   #2
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For simplicity here also the experimental circuit.

Patrick
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Old 8th December 2009, 05:22 PM   #3
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Is'nt that the Sansui super feedforward circuit idea?

http://www.classicsansui.net/images/...TU-S9/PAM3.JPG
http://www.classicsansui.net/images/...TU-S9/PAM4.JPG

Last edited by bobodioulasso; 8th December 2009 at 05:26 PM.
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Old 8th December 2009, 05:25 PM   #4
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Does look similar. But he did say there were multiple commercial products.
When I have the parts, I am going to give it a try.


Patrick
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Old 8th December 2009, 06:10 PM   #5
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in this case this thread could be of interest:
Yamaha's Hyperbolic Conversion Amplification (HCA) Circuit
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Old 8th December 2009, 06:28 PM   #6
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Quote:
Originally Posted by EUVL View Post
A while back, someone brought up this circuit :

Distortion removal circuit

I thought it was very clever and interesting. With my limited knowledge of Japanese and amplifier design, and with the help of Babbel Fish, I put together a not-too-perfect translation of the article, and hope that it will stimulate some discussion.

If a native speaker spots any mistakes, please feel free to correct. And I hope the the original author has no objections to me posting it here.




Patrick
The problem here is always the efficient and effective adding of two signals
at the amp output - at low impedance levels. That is shown in the data, which is orders of magnitude worse than a regular nfb amp.
Hawksford has written about this and one option is to add the error signal not at the output but at the input - which is much easier. This also has - in theory - total error nulling.

My error correction amp as described in both Elektor April/May 2008 and in AudioXpress this year uses this method.
These are intresting circuits to play around with!

jd
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Old 8th December 2009, 06:35 PM   #7
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Isn't Mr. Shinichi Kamijo a diyaudio member?
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Old 8th December 2009, 07:19 PM   #8
EUVL is offline EUVL  Europe
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Jan,

Could you post your circuits here ?


Patrick
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Old 8th December 2009, 07:46 PM   #9
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Originally Posted by EUVL View Post
Jan,

Could you post your circuits here ?


Patrick
Officially, no. The publisher owns them. But I'll ask.

jd
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Old 8th December 2009, 07:51 PM   #10
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Maybe the author would be kind enough to send a copy to a fan ??
I think he might not need approval for that .....




Patrick
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