Patent ID: 6897658
Filing Date: 2005-05-24
Classification: G01R

Abstract:
1. A circuit for selectively enabling and disabling n-coils, said circuit comprising: (a) n-drivers powered by a current source, each of said n-drivers having a pair of transistors disposed such that a control terminal of one of said transistors is connected to a control terminal of an other of said transistors to form a common node thereat, said n-drivers disposed in a totem-pole configuration such that: (b), each of said n-drivers for operating a corresponding one of said n-coils by being responsive at said common node therefor to (i) a coil disable signal by activating said one transistor thereof and deactivating said other transistor thereof thereby not only drawing current away from and thus disabling said corresponding coil but also allowing said current to flow through said one transistor and thus be available as a source of current to a successive one of said n-drivers and (ii) a coil enable signal by deactivating said one transistor thereof and activating said other transistor thereof thereby allowing said current not only to flow serially through said corresponding coil and said other transistor thus enabling said corresponding coil but also to be available as a source of current to said successive one of said n-drivers.