公开(公告)号：EP0720151A2

公开(公告)日：1996-07-03

申请号：EP95309393.7

申请日：1995-12-22

申请人： SGS-THOMSON MICROELECTRONICS, INC.

发明人： Cammeron, Scott Warren

IPC分类号： G11B5/02 ,  H03K17/66

CPC分类号： G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B2005/0013 ,  G11B2005/0016 ,  H03K17/662

摘要： An innovative circuit for driving the write head. All of the driving transistors (QN3...8) are NPN, and are prevented from saturation. This is achieved by shifting and scaling down (SSA,SSB) the differential drive current applied to the pull-up transistors (QN3,QN4), to drive the pull-down transistors (QN8,QN7) with levels such that the pull-down transistors cannot reach saturation. This provides a very simple circuit in which all four of the drive transistors are NPN, and all are kept out of saturation. Moreover, the peak write current applied to the head is precisely limited.

摘要翻译： 用于驱动写入头的创新电路。 所有的驱动晶体管（QN3 ... 8）均为NPN，防止饱和。 这通过将施加到上拉晶体管（QN3，QN4）的差分驱动电流移位和缩小（SSA，SSB）来实现，以驱动下拉晶体管（QN8，QN7），使得下拉 晶体管不能达到饱和。 这提供了一个非常简单的电路，其中所有四个驱动晶体管都是NPN，并且全部都保持在饱和状态。 此外，施加到头部的峰值写入电流被精确地限制。

公开(公告)号：EP0720151A3

公开(公告)日：1996-08-28

申请号：EP95309393.7

申请日：1995-12-22

申请人： SGS-THOMSON MICROELECTRONICS, INC.

发明人： Cammeron, Scott Warren

IPC分类号： G11B5/02 ,  H03K17/66

CPC分类号： G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B2005/0013 ,  G11B2005/0016 ,  H03K17/662

摘要： An innovative circuit for driving the write head. All of the driving transistors (QN3...8) are NPN, and are prevented from saturation. This is achieved by shifting and scaling down (SSA,SSB) the differential drive current applied to the pull-up transistors (QN3,QN4), to drive the pull-down transistors (QN8,QN7) with levels such that the pull-down transistors cannot reach saturation. This provides a very simple circuit in which all four of the drive transistors are NPN, and all are kept out of saturation. Moreover, the peak write current applied to the head is precisely limited.