公开(公告)号：SG87807A1

公开(公告)日：2002-04-16

申请号：SG1999002459

申请日：1999-05-17

Applicant: IBM

Inventor： PEPPEN VAN JACOBUS ,  CONTRERAS JOHN THOMAS ,  KLAASSEN KLAAS BEREND

IPC: G11B5/00 ,  G11B5/012 ,  G11B5/52 ,  G11B5/02 ,  G11B5/09

Abstract: A magnetic-head write-driver circuit includes a write-driver circuit and a by-pass driver circuit coupled in parallel to a signal path between the input and the output of the magnetic-head write-driver circuit. The write-driver circuit receives an input signal having transitions and outputs a first write signal related to the input signal. The by-pass driver circuit outputs an assist signal that is coupled to the first write signal to form an output write signal. The assist signal is related to transitions of the first write signal and assists in shortening reversal time of the transitions of a write signal by producing "overshoots" in the write signal at the time of the transitions. Additionally, the assist signal assists in charging and discharging a parasitic capacitance associated with an output of the magnetic-head write-driver circuit. The assist signal can add a current to, and/or enforce a voltage on, the first write signal to form the output write signal.

公开(公告)号：SG54541A1

公开(公告)日：1998-11-16

申请号：SG1997002859

申请日：1997-08-08

Applicant: IBM

Inventor： KLAASSEN KLAAS BEREND ,  PEPPEN VAN JACOBUS

IPC: G01R33/035 ,  G01R33/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/03 ,  G11B5/39 ,  G11B5/40 ,  G11B5/48 ,  G11B5/596 ,  G11B33/12

Abstract: A circuit for producing a predetermined effective magnetic bias of the sensor portion having a sensor resistance (RS) of an MR transducer including a sensor lead portion and a front-lead portion having respective lead resistances (RL,RF), by generating a controlled bias current (IB) through the MR transducer; a magnetoresistive head/arm electronics (AE) device comprising a magnetoresistive transducer and its magnetic bias circuit.