AP System 1 vs. System 2 (and what can they do) - diyAudio
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Old 16th December 2005, 07:22 AM   #1
Kevinbd is offline Kevinbd  United Kingdom
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Default AP System 1 vs. System 2 (and what can they do)

Hello,

I am interested in obtaining a AP system model 2 (think the model 1 has been superceeded).

Obviously these units can measure THD. Measuring PSRR is off interest.

The most critical part I am interested in, is whether they can plot a graph (presumably on a pc) that shows loop gain and phase up to the unity gain point. Like you see in some graphs on op amp datasheets. ie. the easier way :-)

To be honest, I ain't good enough to do NFB calculations. Think some people have mentioned the middlebrook technique and such things as breaking the feedback loop apart and using a network anaylizer etc.

Can these AP systems do this ? (would probably have to get someone to use it)

Help appreciatted

Kevin
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Old 16th December 2005, 07:28 AM   #2
lineup is offline lineup  Sweden
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AP = all pass filter, I have heard about

I have no idea what an AP system is.
What is it?
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Old 16th December 2005, 08:01 AM   #3
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Audio Precision ?
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Old 16th December 2005, 08:03 AM   #4
Kevinbd is offline Kevinbd  United Kingdom
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Indeed.

Audio Precision Systems as used by good amp designers like Doug Self, Nelson Pass and Walt Jung for his super regulator designs and so on.
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Old 16th December 2005, 08:11 AM   #5
Kevinbd is offline Kevinbd  United Kingdom
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It seems to me the really tricky part of amplifiers is the NFB loop and subsequent compensation methods used.

Would like to use dual pole compensation in a discrete linear regulator (because it can sustain it's PSRR upto higher frequencies) . Also experiment with PLIL compensation on a JLH mosfet design etc.

To be honest I would be quite happy to pay some one to do this!!

Best Regards

Kevin
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Old 16th December 2005, 09:08 AM   #6
clem_o is offline clem_o  Philippines
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I've always had the impression that an AP costs lots of $ - something only a company 'really' into audio design would be able to justify!! Anyone know current priciings? Its not on their website (understandably)...

Cheers
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Old 17th December 2005, 04:43 AM   #7
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Hi Kevin Bd,


I have used the AP test sets a few times when working for companies that had them. I only ever used them for THD, harmonic analysis, crosstalk, noise and the like. I don't think this what your looking for. Another audio analyser can be found closer to home -

http://www.insidehi-fi.co.uk/cp/0901...0901-prism.htm

But a sim program will roughly sort your design, then it's just fine tuning if your models are good.

I'll have a look at your ccts for you if you send me the details.

Cheers,
Greg
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Old 18th December 2005, 02:26 AM   #8
Kevinbd is offline Kevinbd  United Kingdom
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Excellent stuff greg!
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