Patent ID: 6307695
Filing Date: 2001-10-23
Classification: G11B

Abstract:
A device for writing information to a magnetic medium, said device comprising:an inductive head having a first terminal and a second terminal;a write amplifier coupled to the inductive head, said write amplifier receiving an information signal corresponding to said information, amplifying said information signal, and driving a current, corresponding to the amplified information signal, through the inductive head to generate a magnetic flux at the inductive head, said magnetic flux writing a bit of the information on the magnetic medium, the current corresponding to each bit of the information having a rising portion, a peak portion, and a settling portion;a damping network coupled to the inductive head; anda further damping network also coupled to the inductive head, wherein the damping network comprises:a low impedance branch having a first resistive element;means for detecting the current through the inductive head, said detecting means sensing a voltage across the inductive head, said detecting means comprising a high impedance branch having a second resistive element and a capacitive element coupled to said first terminal of said inductive head; andmeans for coupling the low impedance branch to the inductive head and the write amplifier after said detecting means detects that the current has reached the peak portion, said coupling means comprising a switch connected in series with said first resistive element for coupling the low impedance branch to the second terminal of the inductive head, said switch having a control electrode coupled to a node between the second resistive element and the capacitive element of the high impedance branch such that said switch is rendered conductive in response to the voltage across said inductive head,whereby said low impedance branch diverts current from the inductive head for reducing a duration of the settling portion of the current,and wherein the further damping network comprises:a high impedance branch coupled to said second terminal of said inductive head; anda low impedance branch coupled to said first terminal of said inductive head.