What shielding techniques would be best suited for a digital sensor (3 wires – Pwr, Gnd, Sig) in a noisy environment (specifically fluorescent lighting)?
Twisted pair (trio in this case) works well for differential voltages, but I suspect it won't be effective here even though the current in the wires is balanced.
Does shielded wire require a separate ground wire, or is it acceptable to use the shielding as ground? Should the shielding be ground at both ends, or only at the PCB?
Edit: Sensor is connected to PCB via ~1m of cable.
Best Answer
I suggest you purchase / check out a copy of Henry Ott's "Noise Reduction Techniques in Electronic Systems". It talks about these things.
Don't ground the shield at both ends, as this creates a ground loop. The PCB end is probably the best place to ground the shield.