Patent ID: 7453659

Claim:
A writer circuit for an inductive write head, the writer circuit comprising: a write current circuit coupled to the inductive write head, the write current circuit configured to provide a first current to the inductive write head and comprising four MOS transistors arranged in an H-bridge configuration; wherein each MOS transistor in the write current circuit mirrors a current provided by a current source to produce the first current and is part of a current mirror comprised of the MOS transistor and an additional MOS transistor; and wherein a switch is coupled in between a gate terminal of the MOS transistor and a gate terminal of the additional MOS transistor, and wherein the switch selectively breaks a current path in the current mirror; a metal-oxide semiconductor (MOS) transistor boost circuit coupled to the write current circuit, the MOS transistor boost circuit configured to provide a second current for a specified time period to the inductive write head responsive to a control signal, wherein a sum of the first current and the second current is a write current for the inductive write head; and a matching circuit coupled to the inductive write head, the matching circuit configured to selectively decouple a resistive element from the inductive write head responsive to the control signal.