[sdiy] How to design out "usb noise"?

[Mike Bryant]

Agreed.  I've got PCBs with a RaspberryPi CM4 running at 1.8GHz, a couple of other processors running at 200MHz, switchmode regulators, USB and MIDI connectors, then a PCM5102 DAC and balanced analogue output stages and all the various sockets (some on the backside) all on a PCB 100mm * 100mm.  It's how you do the grounding that matters, very little else.

In fact the prototype used 2 layers as well, but now 4 layers are so cheap at JLCPCB just go straight to that - makes life so much easier :-)
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Mattias Rickardsson <mr at analogue.org>
Sent: 03 February 2024 13:18
To: cheater cheater <cheater00social at gmail.com>
Cc: Synth DIY <synth-diy at synth-diy.org>
Subject: Re: [sdiy] How to design out "usb noise"?

Den lör 3 feb. 2024 12:32cheater cheater <cheater00social at gmail.com<mailto:cheater00social at gmail.com>> skrev:
it makes sense to put the digital stuff on a separate pcb that's at
least 1cm away from the analog stuff. (or at least, strip off a huge
chunk of copper between them). This to prevent capacitive coupling.

It's the grounds that need to be galvanically isolated. Signals disturbing signals are not the issue here afaik.

/mr
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