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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th March 2005, 01:26 PM   #51
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Quote:
From my understanding, you can say that ClassD has openloopbandwidth flat to ......
IF you want to use NFB then you will for sure have to make a trade-off. You can't get flat open-loop FR up to the carrier frequency AND apply NFB at once. So you may most probably use a topology with a flat open loop gain up to 10 or 20 kHz (which alone beats many class-AB amps !!!). The loop itself is much easier to calculate than with an ordinary class AB. And if you still want more NFB then you can use a multiloop topology.

I remember how we listened to a classs-d amp we once developed (in 1991) that had THD as high as 0.44 % but an open-loop BW of 15 kHz and it did not sound harsh in any way - the contrary was true in fact . And this amp was not even intended as audio amp at all but as a lab power source.

Regards

Charles
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Old 10th March 2005, 01:45 PM   #52
MikeB is offline MikeB  Germany
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Okay, i was speaking about selfoscillating topology, already having
NFB inside, with full openloop-FR. The nice thing with selfoscillating is,
as it is intended to oscillate, no stabilizing in any form is necessary...

Mike
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Old 11th March 2005, 10:19 PM   #53
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IMHO, one of the beauties of UCD amps (I've not heard other classD amps) is that, being able to drive and make sound very good even non HiEnd speakers, and making good partnership with transformer based volume controls, one really can focus (money an effort) on the source!

Enjoy your music now...

Mauricio
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Old 12th March 2005, 07:51 AM   #54
R Dijk is offline R Dijk  Norway
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I see no reason to amplify "everything"
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Old 12th March 2005, 08:49 AM   #55
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Default hehe, that was good...Big Charlie, the amplifier!

Thank's man!

I am hearing, rigth now...Scotish pipe music with drums....yeah!...very good when amplified with class D

regards,

Carlos
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Old 12th March 2005, 11:23 AM   #56
jmateus is offline jmateus  United States
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Default Big Charlie...the amplifier

Scotish bag pipes are wonderful, they make music right to be
amplified by Class D, class T amplifiers, like the modules of 41Hz.com.
Is this a pretext to speak about these modules? I have to resist to
the impulse of speaking about these modules, they look gorgeous,
I'm about to finish one but I didn't as of yet.
May be later...

But Carlos, how about a military march from Germany?
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Old 12th March 2005, 01:17 PM   #57
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Default I was interested in some translations, but my German friend do not like to talk about

This subject..... i do not know his reason, but must exist a good reason to avoid.... some cloudy days to Germany i suppose.

But i visited Heindrich Grune in Petropolis, they buried a lot of old Nazi enormous phonograph discs.... i was there to recover that historic material..... and i made recordings.... and have a lot of conversations on it.....i do not understand 90 percent of the words.

Those voices, hard to understand, because of old recording quality, despite re-adjusted, are noise and unclear, but in my class D, the reproduction is more clear....the unit that can let me understand some words.

Where's the pictures?..... what about the popping, jumping SMDs?

You can put some rubber point when fixing it to solder, to avoid send them to "space"....hehe...they like to fly away, and no one can find them in our "damned trashed dirty laboratories!"

Carlos
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Old 12th March 2005, 03:39 PM   #58
dmason is offline dmason  United States
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Question

Can any of the current or future UcD chips allow for battery power?
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Old 12th March 2005, 09:23 PM   #59
IVX is offline IVX  Russian Federation
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If you'll see the power comparator for around 9V operation, hence UcD will, because the UcD=comparator+feedback network(fully passive components).
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