I'm designing a circuit that involves a digital compass and I'm worried about effects from a ground plane directly under it.
The digital compass can pick up Earth's weak magnetic field . . . so can current going through the ground plane under the digital compass affect readings?
Average current is maximum 20mA at 3.3V, but with 1 amp current spikes for a few milliseconds about 20 times per second. Proper capacitors are placed between power and ground.
Should I keep the ground plane far away, or am I'm being over careful? If not for potential interference, there are specific benefits to the ground plane, so I don't want to 'just play it safe'.
I'd want to design around the problem *before* spending time/money prototyping, so experimentation is ruled out for now :?
edit: corrected spelling errors