Fender Paramount Series A guitar pickup is basically much like a powerful microphone coil. For decades, active microphones have now been wired with the voice coil attached to the principal of the microphone's transformer, and not recommended to surface (‘floating'). The microphone's event is usually linked to the cable shield, which is connected to the microphone amplifier's soil (see Rane's site for more discussion).
By and large, energetic microphones are very calm devices as a result of the mixture of transformer solitude and balanced, hanging sign lines during, along with guarded, humbucking coils.
So why not instruments? Guitars are notoriously plagued by noise. Humbucking pickups are merely an incomplete (though important!) solution. Well-known answer would be to move your guitar collection to a balanced output, as being a microphone. A similar idea was published this 2001 patent application like this Fender Paramount Series?