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Old 24th October 2012, 03:07 AM   #1
Bonsai is offline Bonsai  Taiwan
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Default 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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Old 24th October 2012, 10:39 AM   #2
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Any takers?
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Old 24th October 2012, 11:19 AM   #3
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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:

Click the image to open in full size.

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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Old 24th October 2012, 11:41 AM   #4
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There is other thread about Class i and siblings Class i and siblings
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Old 24th October 2012, 09:10 PM   #5
jcx is offline jcx  United States
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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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Old 14th November 2012, 02:46 PM   #6
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3rd part of the article.

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Old 16th November 2012, 01:13 AM   #7
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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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Old 18th November 2012, 07:45 PM   #8
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Default Main benefit ???

Quote:
Originally Posted by Bonsai View Post
...
Main benefit is a 'purely resistive' output impedance.
...
Hi Andrew,

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.
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Old 18th November 2012, 07:51 PM   #9
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Quote:
Originally Posted by Struth View Post
Although one benefit is a resistive output impedance, I believe the "main" benefit is elimination of crossover distortion and related low-level nonlinearities.
We've seen very low distortion available from ClassAB for a long time now - why would Class i be of any interest other than intellectual ?
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Old 18th November 2012, 08:02 PM   #10
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Nevertheless, even 'academic curiosities' are worth a closer look.
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