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class XD - Doug Self is at it again
class XD - Doug Self is at it again
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Old 7th December 2006, 01:23 PM   #1
jan.didden is offline jan.didden  Europe
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Default class XD - Doug Self is at it again

Hi,

Anybody seem this, any opinions? Touted as the next breakthrough in analogue amps, well, don't know about that.

http://www.cambridgeaudio.com/assets...r8-2-06web.pdf

Certainly the technique is far from new. They refer to a UK patent, anybody can get a hold of that?

Jan Didden
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Old 7th December 2006, 01:27 PM   #2
SY is offline SY  United States
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class XD - Doug Self is at it again
Take a look at John Broskie's writeup at www.tubecad.com .
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Old 7th December 2006, 01:35 PM   #3
jan.didden is offline jan.didden  Europe
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Quote:
Originally posted by SY
Take a look at John Broskie's writeup at www.tubecad.com .

Yes I have seen that. The idea comes and goes in many places, that is why I would love to read the patent application. I am always fascinated by literary attemps to present as a 'breakthrough' things that are already gathering dust...

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Old 8th December 2006, 10:59 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
I cannot fault the white paper.

There are similarities to the ClassA conversion used to linearise ClassAB push pull opamps.
Which came first?

Can we reduce dissipation in the converted opamp this way?

How does the XDpp work?
What is inside the -a stage that varies the CCS?
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Old 10th December 2006, 03:40 PM   #5
Paul Ranson is offline Paul Ranson  England
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This may link to the patent...

http://v3.espacenet.com/origdoc?DB=E...&QPN=GB2424137

Paul
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Old 10th December 2006, 04:19 PM   #6
sreten is offline sreten  United Kingdom
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Quote:
Originally posted by AndrewT

I cannot fault the white paper.
Hmmm........

Well its a white paper so it doesn't have to be accurate.

IMO it sets out to deliberately mislead the reader into
thinking it is applicable to EF output states, it is not,
though they haven't bothered swapping the types
of the output devices, a PNP is shown as NPN.
(figs 5, 6 and 7)

It only works well with CFP outputs.

/sreten.
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Old 10th December 2006, 04:28 PM   #7
Jan Dupont is offline Jan Dupont  Denmark
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Have a look at this thread;
http://www.diyaudio.com/forums/showt...916&highlight=

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