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1.发明公开MAGNETIC MEDIUM RECORDING APPARATUS WITH A READ CHANNEL COMPRISING A PROGRAMMABLE WRITE-TO-READ TRANSITION NOISE SUPPRESSING CIRCUIT 审中-公开磁记录装置，其中：HARVEST CHANNEL FOR，当切换为从写在读取操作发生噪音，可编程STÖRSIGNALUNTERDRÜCKUNGSSCHALTUNGHAVING
公开(公告)号：EP1141955A1
公开(公告)日：2001-10-10
申请号：EP00977407.6
申请日：2000-09-21
CPC分类号： G11B20/10009 , G11B5/012 , G11B5/035 , G11B2005/001
摘要： A magnetic storage apparatus includes first and second control devices to effectively reduce a disturbance which occurs in a read channel (7A1, 7A2; 7B1, 7B2) of the apparatus upon transition from a write mode to a read mode. The first control device (5B) is in a first gain stage coupled to a read sensor. The second control device is a back-end circuit (5C) and, in addition to reducing the duration of the write-to-read disturbance, is effective to significantly reduce offset of the apparatus. A user interface in the form of a serial interface allows user programmability of both of the first and second control devices. The serial interface and the read channel with the first and second control devices are embodied in a pre-amplifier integrated circuit. The programmability affords flexibility to the IC manufacturer as well as to the manufacturer of the magnetic storage device in optimizing the read channel to account for model-to-model and unit-to-unit variations in the write-to-read disturbance.
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2.发明授权CIRCUIT FOR REDUCTION AND OPTIMIZATION OF WRITE-TO-READ SETTLING TIMES IN MAGNETIC MEDIUM STORAGE DEVICES 有权电路，以减少和写读的过渡时间优化磁记录DEVICES
公开(公告)号：EP1135769B1
公开(公告)日：2004-12-01
申请号：EP00967792.3
申请日：2000-09-25
CPC分类号： H03F3/45179 , G11B20/10009 , G11B2005/001 , H03F3/45098 , H03F3/45941 , H03F2203/45466 , H03F2203/45506 , H03F2203/45631 , H03F2203/45634 , H03F2203/45646 , H03F2203/45702 , H03F2203/45726 , H03H11/1291
摘要： A preamplifier integrated circuit for a magnetic storage device includes a filter (155) in a forward signal path which has a low corner frequency (LCF) which varies in a time dependent manner related to the duration of a write-to-read disturbance induced by a transition from a write mode to a read mode. Favorably, the filter (155) in the forward signal path is formed by a unity gain differential emitter-follower in the forward path and a low pass filter (LPF) in a feedback path around the differential emitter-follower, the pole of the LPF being moved to achieve the movement of the LCF in the forward path. In the steady-state read mode, the filter arrangement also significant reduces DC offset in the read channel. A capacitance in the LPF is variable or made up of several switchable capacitors. The values of the capacitance may be programmed through a serial interface.
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公开(公告)号：EP1092221B1
公开(公告)日：2006-08-16
申请号：EP00920726.7
申请日：2000-04-17
CPC分类号： H03F3/4508 , G11B5/012 , G11B5/035 , G11B5/09 , G11B19/02 , G11B20/10009 , G11B33/122 , G11B2005/0013 , G11B2005/0016 , H03F2203/45458 , H03F2203/45612 , H03F2203/45648
摘要： A feedback system includes an emitter-follower as a gain stage in the forward path. The emitter-follower has a very wide band width and does not, by itself, effectively narrow the bandwidth of an information channel in which it is used. According to the invention, the feedback system includes a differentiator with a programmable zero in the feedback path. The zero in the feedback path creates a pole in the forward path and the programmed location of the zero influences the pole and controls the bandwidth of the forward path. Using a switch in the feedback path enables the differentiator to be turned off or switched out of the loop so that the forward path is not effected when bandwidth reduction is not required. With appropriate switching, the same differentiator is used to create a zero in the forward path as well as pole in the forward path.
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4.发明公开CIRCUIT FOR REDUCTION AND OPTIMIZATION OF WRITE-TO-READ SETTLING TIMES IN MAGNETIC MEDIUM STORAGE DEVICES 有权电路，以减少和写读的过渡时间优化磁记录DEVICES
公开(公告)号：EP1135769A1
公开(公告)日：2001-09-26
申请号：EP00967792.3
申请日：2000-09-25
CPC分类号： H03F3/45179 , G11B20/10009 , G11B2005/001 , H03F3/45098 , H03F3/45941 , H03F2203/45466 , H03F2203/45506 , H03F2203/45631 , H03F2203/45634 , H03F2203/45646 , H03F2203/45702 , H03F2203/45726 , H03H11/1291
摘要： A preamplifier integrated circuit for a magnetic storage device includes a filter (155) in a forward signal path which has a low corner frequency (LCF) which varies in a time dependent manner related to the duration of a write-to-read disturbance induced by a transition from a write mode to a read mode. Favorably, the filter (155) in the forward signal path is formed by a unity gain differential emitter-follower in the forward path and a low pass filter (LPF) in a feedback path around the differential emitter-follower, the pole of the LPF being moved to achieve the movement of the LCF in the forward path. In the steady-state read mode, the filter arrangement also significant reduces DC offset in the read channel. A capacitance in the LPF is variable or made up of several switchable capacitors. The values of the capacitance may be programmed through a serial interface.
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公开(公告)号：EP1092221A1
公开(公告)日：2001-04-18
申请号：EP00920726.7
申请日：2000-04-17
CPC分类号： H03F3/4508 , G11B5/012 , G11B5/035 , G11B5/09 , G11B19/02 , G11B20/10009 , G11B33/122 , G11B2005/0013 , G11B2005/0016 , H03F2203/45458 , H03F2203/45612 , H03F2203/45648
摘要： A feedback system includes an emitter-follower as a gain stage in the forward path. The emitter-follower has a very wide band width and does not, by itself, effectively narrow the bandwidth of an information channel in which it is used. According to the invention, the feedback system includes a differentiator with a programmable zero in the feedback path. The zero in the feedback path creates a pole in the forward path and the programmed location of the zero influences the pole and controls the bandwidth of the forward path. Using a switch in the feedback path enables the differentiator to be turned off or switched out of the loop so that the forward path is not effected when bandwidth reduction is not required. With appropriate switching, the same differentiator is used to create a zero in the forward path as well as pole in the forward path.
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