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Old 24th August 2006, 06:19 PM   #31
Hara is offline Hara  United States
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I am interested in how much phase shift exists for all the class D amps mainly for subwoofer integration. Wouldn't phase shifts have the largest effect in the bass region? IIRC, Nuuk said he had problems with his tripath amp working with his sub amp.
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Old 24th August 2006, 08:18 PM   #32
Pano is offline Pano  United States
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That would be phase shift between input and output. Not the same as between channels.

I think there is a lot of phase shift going on between input and output, and it's not linear with frequency - that's the problem. If I figure out a good way to measure it, I'll let you know.
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Old 24th August 2006, 08:47 PM   #33
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This would only be dependent on the filter used though right? So even with the same chip but with different filters we would have different phase shifts, right?

If the phase is occuring in the chips themselves than I think that would be more difficult problem.
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Old 25th August 2006, 06:19 AM   #34
Pano is offline Pano  United States
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I would depend on the input filter, yes. But as we use rather large input caps, there shouldn't be any real phase problem above 15Hz.

The input/output phase shift (If there really is one) is likely coming from the chip, and/or the output filter. I think it is the modulator on the chip.

Need to test it.
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