公开(公告)号：EP1310955A3

公开(公告)日：2007-02-21

申请号：EP02257758.9

申请日：2002-11-08

Applicant: STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Posat, Baris ,  Ozanoglu, Kemal ,  Alini, Roberto

IPC: G11B19/02 ,  G11B5/012 ,  G11B5/02

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013

Abstract: A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally provide drive voltage signals to the write head that have no common mode voltage levels during transitions between steady state current levels in the write head. In other words, the drive voltage signals applied to the write head are substantially entirely differential during write head current transitions. In an exemplary embodiment of the present invention, a driver circuit (100) includes switching circuitry (111,112,113,114,116,117,118,119) connected between the terminals (42A,42B) of the write head (42) and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry (125) that generates control signals for controlling the switching circuitry.

公开(公告)号：EP1310955A2

公开(公告)日：2003-05-14

申请号：EP02257758.9

申请日：2002-11-08

Applicant: STMicroelectronics, Inc.

Inventor： Venca, Alessandro ,  Posat, Baris ,  Ozanoglu, Kemal ,  Alini, Roberto

IPC: G11B19/02 ,  G11B5/012 ,  G11B5/02

CPC classification number: G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B2005/0013

Abstract: A circuit and method are disclosed for relatively rapidly causing the current flowing through a write head to transition between steady states without generating an appreciable amount of capacitively-coupled noise. Embodiments of the present invention generally provide drive voltage signals to the write head that have no common mode voltage levels during transitions between steady state current levels in the write head. In other words, the drive voltage signals applied to the write head are substantially entirely differential during write head current transitions. In an exemplary embodiment of the present invention, a driver circuit (100) includes switching circuitry (111,112,113,114,116,117,118,119) connected between the terminals (42A,42B) of the write head (42) and reference voltage supplies, such as positive and negative voltage supplies. The driver circuit further includes timing circuitry (125) that generates control signals for controlling the switching circuitry.

Abstract translation: 公开了一种电路和方法，用于相对快速地使流过写入头的电流在稳定状态之间转变而不产生可观量的电容耦合噪声。 本发明的实施例通常在写入头中的稳态电流电平之间的转换期间向写入头提供不具有共模电压电平的驱动电压信号。 换句话说，施加到写入头的驱动电压信号在写入头电流转换期间基本上完全不同。 在本发明的示例性实施例中，驱动器电路（100）包括连接在写入头（42）的端子（42A，42B）之间的开关电路（111,112,113,114,116,117,118,119）和诸如正和负电压源的参考电压源。 驱动器电路还包括产生用于控制开关电路的控制信号的定时电路（125）。