Play Rock A electric guitar pickup is essentially similar to a dynamic mike coil. For decades, active microphones have been wired with the voice coil attached to the principal of the microphone's transformer, and maybe not introduced to ground (‘floating'). The microphone's event is usually connected to the cable shield, which is attached to the microphone amplifier's floor (see Rane's website for more discussion).
By and large, energetic microphones are very quiet products as a result of the mix of transformer isolation and healthy, suspended transmission lines for the duration of, in addition to protected, humbucking coils.
So why don't you guitars? Guitars are notoriously plagued by noise. Humbucking pickups are merely a partial (though important!) solution. The most obvious option is to move the guitar pickup to a healthy productivity, just like a microphone. A similar idea was printed this 2001 patent request like this Play Rock?