Electronics > Beginners
Cutting through the BS of low noise supply design
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ezalys:
Got it! So it's mostly IR drops in the ground plane. That makes sense.

So someone on the diyaudio forums suggested floating the converter and analog frontend by using an isolated power supply on the board itself and then use optoisolators and such to transfer clock and data lines over. Is this a good idea?
T3sl4co1l:
Not just IR drops, but L*dI/dt drops too.  Which in copper, is dominant over about ~10s kHz.

Optos are pretty nice.

Beware that an isolated supply is yet another cut between planes, except even worse than that, you have AC noise directly across it.  And unless it's a special design, there will be significant capacitance along that cut, too.

Tim
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