发明公开
EP0720151A3 Differential high speed inductive driver with a bidirectional current limiting output stage
失效
差动Hochgeschwindigkeitsinduktivitätstreiber用双向电流限制器输出级
- 专利标题： Differential high speed inductive driver with a bidirectional current limiting output stage
- 专利标题（中）： 差动Hochgeschwindigkeitsinduktivitätstreiber用双向电流限制器输出级
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申请号： EP95309393.7申请日： 1995-12-22
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公开(公告)号： EP0720151A3公开(公告)日： 1996-08-28
- 发明人: Cammeron, Scott Warren
- 申请人： SGS-THOMSON MICROELECTRONICS, INC.
- 申请人地址： 1310 Electronics Drive Carrollton Texas 75006-5039 US
- 专利权人： SGS-THOMSON MICROELECTRONICS, INC.
- 当前专利权人： SGS-THOMSON MICROELECTRONICS, INC.
- 当前专利权人地址： 1310 Electronics Drive Carrollton Texas 75006-5039 US
- 代理机构： Palmer, Roger
- 优先权： US366793 19941230
- 主分类号： G11B5/02
- IPC分类号： G11B5/02 ; H03K17/66
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.
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