Here is a series of very interesting articles on how to handle grounding in a PCB design, to avoid hum and EMI, especially when working with both analog and digital (mixed signal) chips.
- Part 1 – Principles of current flow
- Part 2 – Design to minimize signal path crosstalk
- Part 3 – Power currents and multiple mixed signal chips
Other articles in the same topic:
If you’re into electronics and PCB design, check out EDN.com where these articles come from, it’s a real gold mine of information and tips!