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Old 28th August 2007, 02:01 AM   #31
panson_hk is offline panson_hk  Hong Kong
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a useful reference http://www.hottconsultants.com/pdf_f...ixedsignal.pdf
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Old 28th August 2007, 02:11 AM   #32
panson_hk is offline panson_hk  Hong Kong
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Originally posted by ilimzn

Even though we are talking audio frequencies here, some of the things that happen in an amp are way above that band - in particular half-wave rectification in output stages of class AB amps, correction signals for NFB loops, etc. At these frequencies, you need to consider the full current loop, not just the ground line part of it. A ground plane (properly implemented) has the advantage that return paths tend to form a shadow of he outgoing path on the ground plane, hence keeping impedances at a minimum,
I agree with your point.
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Old 28th August 2007, 03:56 AM   #33
banana is offline banana  Hong Kong
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Originally posted by panson_hk
a useful reference http://www.hottconsultants.com/pdf_f...ixedsignal.pdf
This is very true.

I've worked with an OEM project, which is a DAC board designed with the ground plane jointed at power supply only (like the Burr-Brown EVM approach). It radiates very badly around 700MHz, clearly the harmonics of I2S MCK. Later I solved the problem by adding wide junction across AGnd/DGnd plane, just underneath the I2S bus.
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Old 3rd September 2007, 04:00 PM   #34
h_a is offline h_a  Europe
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@panson_hk: thanks a lot for the article! It's a pity that interesting information like this can only be found scarcely!

Anyway, it mainly argues against the isolation of ground planes and recommends physically separated layouting (and a common ground plane in general).

However there's no hint of the usefullness or potential disadvantages of using ground planes per se. Oh dear.

All the best, Hannes
High Octane phono preamp Wiki
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Old 3rd September 2007, 10:08 PM   #35
audioDIYer is offline audioDIYer  Europe
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