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公开(公告)号：DE68914744T2
公开(公告)日：1994-11-24
申请号：DE68914744
申请日：1989-06-23
Applicant: IBM
IPC: G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/40 , G11B19/04 , G11B20/00 , G11B20/22 , G11B33/10
Abstract: A method and circuitry are disclosed for suppressing additive transient disturbances in a data channel; e.g., due to thermal transients caused by an MR transducer contacting a moving storage surface. Positive and negative envelope detectors (11, 12) each have their inputs connected to the channel, and provide respective outputs which are summed (13) and contain an envelope component and a residue component. A buffer (14) interconnects the detectors to allow both detectors (11, 12) to follow rapid positive excursions of the data channel signal. A nonlinear signal-adaptive filter (15) is connected to the summed output to further reduce the residue component. The data channel signal (or preferably the output from a delay means connected to the channel) is summed with the output from the filter. The relative amplitudes of these two outputs is set such that the resulting summed output signal is free of additive disturbances.
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公开(公告)号：DE68914744D1
公开(公告)日：1994-05-26
申请号：DE68914744
申请日：1989-06-23
Applicant: IBM
IPC: G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/40 , G11B19/04 , G11B20/00 , G11B20/22 , G11B33/10
Abstract: A method and circuitry are disclosed for suppressing additive transient disturbances in a data channel; e.g., due to thermal transients caused by an MR transducer contacting a moving storage surface. Positive and negative envelope detectors (11, 12) each have their inputs connected to the channel, and provide respective outputs which are summed (13) and contain an envelope component and a residue component. A buffer (14) interconnects the detectors to allow both detectors (11, 12) to follow rapid positive excursions of the data channel signal. A nonlinear signal-adaptive filter (15) is connected to the summed output to further reduce the residue component. The data channel signal (or preferably the output from a delay means connected to the channel) is summed with the output from the filter. The relative amplitudes of these two outputs is set such that the resulting summed output signal is free of additive disturbances.
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公开(公告)号：AT78931T
公开(公告)日：1992-08-15
申请号：AT87104313
申请日：1987-03-24
Applicant: IBM
Inventor： KLAASSEN KLAAS BEREND , JOVE STEPHEN ALAN
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15.发明专利
公开(公告)号：AU617840B2
公开(公告)日：1991-12-05
申请号：AU3915889
申请日：1989-08-01
Applicant: IBM
IPC: G11B5/09 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/40 , G11B19/04 , G11B20/00 , G11B20/22 , G11B33/10 , G11B20/24 , H04B15/00
Abstract: A method and circuitry are disclosed for suppressing additive transient disturbances in a data channel; e.g., due to thermal transients caused by an MR transducer contacting a moving storage surface. Positive and negative envelope detectors (11, 12) each have their inputs connected to the channel, and provide respective outputs which are summed (13) and contain an envelope component and a residue component. A buffer (14) interconnects the detectors to allow both detectors (11, 12) to follow rapid positive excursions of the data channel signal. A nonlinear signal-adaptive filter (15) is connected to the summed output to further reduce the residue component. The data channel signal (or preferably the output from a delay means connected to the channel) is summed with the output from the filter. The relative amplitudes of these two outputs is set such that the resulting summed output signal is free of additive disturbances.
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Patent Agency Ranking
公开(公告)号：DE69317084T2
公开(公告)日：1998-09-17
申请号：DE69317084
申请日：1993-07-14
Applicant: IBM
IPC: G11B5/00 , G11B5/012 , G11B5/02 , G11B5/11 , G11B5/39 , G11B5/40 , G11B5/55 , G11B19/02 , G11B19/04 , G11B23/50 , G11B33/00 , G11B33/14 , H03F3/04 , H03F3/195 , G11B20/24 , G01R33/06
Abstract: Low noise, low power, low voltage amplifier circuits with a single ended input having no common mode rejection for concurrently biasing and amplifying signals generated by magnetoresistive (MR) elements in a disk file. The amplifier circuits comprise a single (grounded) supply voltage source. One terminal of each MR element and the conductive substrate of each MR element and the conductive substrate of each disk in the disk file are grounded to minimize transient conductive asperity currents. The head/disk assembly of the disk file is completely enclosed by a highly conductive electrostatically shielded metallic enclosure that.. operates as a Faraday cage and isolates leads connecting the MR elements with the amplifier circuit from large, fast rise/fall time voltage transients.
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公开(公告)号：DE69317185D1
公开(公告)日：1998-04-09
申请号：DE69317185
申请日：1993-09-16
Applicant: IBM
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公开(公告)号：DE68914075T2
公开(公告)日：1994-10-20
申请号：DE68914075
申请日：1989-09-20
Applicant: IBM
Inventor： JOVE STEPHEN ALAN , KLAASSEN KLAAS BEREND , NOMURA CALVIN SHIZUO , VAN PEPPEN JACOBUS LEONARDUS
Abstract: The invention relates to a protection circuit for a magnetoresistive (MR) element (Rh) having a first terminal and a second terminal in which a first current source is coupled to the first terminal of the MR element to produce a bias current (J1) through the MR element and a second current source is coupled to the second terminal of the MR element to produce a reference current (Iref). According to the invention, circuit means (R,R,B) coupled across the MR element (Rh) senses the centre potential of the MR element substantially midway between the first and second terminals, and a feedback circuit (B) responsive to the sensed centre potential adjusts the current output of the first current source (J1) to maintain the centre potential to a selected reference voltage (Vcentre) to protect the MR element (Rh) from short circuits to a conductive area of the magnetisable recording medium being read by the MR element.
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公开(公告)号：DE68914075D1
公开(公告)日：1994-04-28
申请号：DE68914075
申请日：1989-09-20
Applicant: IBM
Inventor： JOVE STEPHEN ALAN , KLAASSEN KLAAS BEREND , NOMURA CALVIN SHIZUO , VAN PEPPEN JACOBUS LEONARDUS
Abstract: The invention relates to a protection circuit for a magnetoresistive (MR) element (Rh) having a first terminal and a second terminal in which a first current source is coupled to the first terminal of the MR element to produce a bias current (J1) through the MR element and a second current source is coupled to the second terminal of the MR element to produce a reference current (Iref). According to the invention, circuit means (R,R,B) coupled across the MR element (Rh) senses the centre potential of the MR element substantially midway between the first and second terminals, and a feedback circuit (B) responsive to the sensed centre potential adjusts the current output of the first current source (J1) to maintain the centre potential to a selected reference voltage (Vcentre) to protect the MR element (Rh) from short circuits to a conductive area of the magnetisable recording medium being read by the MR element.
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公开(公告)号：DE3781471T2
公开(公告)日：1993-04-08
申请号：DE3781471
申请日：1987-06-16
Applicant: IBM
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