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24th October 2012, 03:07 AM
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#1 |
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diyAudio Member
Join Date: Aug 2006
Location: Taipei, Taiwan
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Class i
Class i discussed here by Kendall Caster-Perry:-
The Class i low-distortion audio output stage (Part 2) | EDN Main benefit is a 'purely resistive' output impeadance. Includes a formal analysis of the circuit - might be an interesting one to explore in a future design, but I dont know it it is suitable for really high powers. |
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24th October 2012, 10:39 AM
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#2 |
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diyAudio Member
Join Date: Aug 2006
Location: Taipei, Taiwan
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Any takers?
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24th October 2012, 11:19 AM
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#3 |
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diyAudio Member
Join Date: Apr 2011
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The article goes into the theory but does not present much by way of an actual circuit.
Part one does present the following as a starting point:  http://www.edn.com/design/consumer/4...h-pull-outputs Putting the theory into practice would be a significant effort.When do we get started? 
Last edited by ingenieus; 24th October 2012 at 11:24 AM. |
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24th October 2012, 11:41 AM
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#4 |
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diyAudio Member
Join Date: Apr 2006
Location: Zagreb
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There is other thread about Class i and siblings Class i and siblings
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24th October 2012, 09:10 PM
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#5 |
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diyAudio Member
Join Date: Feb 2003
Location: ..
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lots of promises in the 1st part write up but I'm not seeing yet how this isn't just another local feedback error correction scheme
mixing output stage local linearizing feedback with a "non-switching" bias scheme has also been done |
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14th November 2012, 02:46 PM
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#6 |
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diyAudio Member
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__________________
It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts - Sherlock Holmes Check out Linear Audio Vol 5! |
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16th November 2012, 01:13 AM
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#7 |
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diyAudio Member
Join Date: Aug 2012
Location: books at londonpower.com
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Hi Guys
Although one benefit is a resistive output impedance, I believe the "main" benefit is elimination of crossover distortion and related low-level nonlinearities. Have fun Kevin O'Connor |
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18th November 2012, 07:45 PM
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#8 | |
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diyAudio Member
Join Date: Nov 2003
Location: Amsterdam
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Main benefit ???
Quote:
It's not as 'purely resistive' as you might think, rather it is Zo + Re, where Zo is about the output impedance of any other (regular) EC OPS. Moreover, we have two Re's, the top and the bottom one. If they aren't exactly equal they create another source of distortion (except in case of class-A operation, of course). I wouldn't see this as 'beneficial' feature of class-I. See: Class i and siblings and also: Class i and siblings Cheers, E.
__________________
Een volk dat voor tirannen zwicht, zal meer dan lijf en goed verliezen dan dooft het licht…(H.M. van Randwijk) |
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18th November 2012, 07:51 PM
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#9 | |
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diyAudio Member
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Quote:
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig. |
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18th November 2012, 08:02 PM
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#10 |
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diyAudio Member
Join Date: Nov 2003
Location: Amsterdam
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Nevertheless, even 'academic curiosities' are worth a closer look.
__________________
Een volk dat voor tirannen zwicht, zal meer dan lijf en goed verliezen dan dooft het licht…(H.M. van Randwijk) |
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