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Class D Switching Power Amplifiers and Power D/A conversion

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Old 10th July 2012, 06:19 PM   #4781
badman is offline badman  United States
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The width of the pulse is the analog, and the 1 and 0 involved in "on and off" in PWM cannot code a discrete value of the waveform absent the width component.

So it tracks based upon the analog width component, not the discrete on and off component.
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Old 10th July 2012, 06:49 PM   #4782
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Quote:
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The width of the pulse is the analog, and the 1 and 0 involved in "on and off" in PWM cannot code a discrete value of the waveform absent the width component.

So it tracks based upon the analog width component, not the discrete on and off component.
I understand that. It's the 1 and 0 component I'm interested in. It's digital because it's a pulse.

But I don't really care to convince anyone of my terminology, except to say jitter is an important element in any pulse-current waveform. Timing is critical---err, more than that, it's essential.
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Old 10th July 2012, 06:57 PM   #4783
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Now this is funny ....

Class-D amplifier - Wikipedia, the free encyclopedia

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"The term "class D" is sometimes misunderstood as meaning a "digital" amplifier."
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Old 10th July 2012, 07:16 PM   #4784
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Originally Posted by StigErik View Post
Now this is funny ....

Class-D amplifier - Wikipedia, the free encyclopedia

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"The term "class D" is sometimes misunderstood as meaning a "digital" amplifier."
The terminology is irrelevant, Stig. Here's what I'm saying: the timing of the pulses is important, essential.
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Old 10th July 2012, 07:21 PM   #4785
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Yes of course, but that does not make Class D digital.
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Old 10th July 2012, 07:31 PM   #4786
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I'm not saying it does because I don't care about semantic games. What's important here is that the amp renders the input waveform a PWM version of that waveform where the timing of those pulses is essential to the amp's operational fidelity.

The best term I can find to describe variation in the timing of those pulses is jitter. Have you a better?
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Old 10th July 2012, 07:34 PM   #4787
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There is an abstraction, a CODING that makes digital what it is. The pulse width, an analog attribute, is what defines the signal output, a repeating 0 1 0 1 0 1 0 1 train ad inifinitum cannot contain an abstract variable coding, since the discrete on/off cycle is in a constant order.
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Old 10th July 2012, 07:36 PM   #4788
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A change in the timing of the PWM carrier will result in a non-reversible change in the analog audio output.

Jitter on a digital signal will not. The audio data remains the same, and can be successfully reclocked.
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Old 10th July 2012, 07:37 PM   #4789
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Quote:
Originally Posted by StigErik View Post
A change in the timing of the PWM carrier will result in a non-reversible change in the analog audio output.

Jitter on a digital signal will not. The audio data remains the same, and can be successfully reclocked.
Yes, a non-reversible change in the analogue output. So get the timing right, yes?
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Old 10th July 2012, 07:39 PM   #4790
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When we see the measured performance of Ncore, I suspect they did get it right....
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