公开(公告)号：JP2000057509A

公开(公告)日：2000-02-25

申请号：JP22554899

申请日：1999-08-09

Applicant: INFINEON TECHNOLOGIES CORP

Inventor： CANARIO RONALD A

IPC: G11B5/09 ,  G11B5/02 ,  G11B5/03 ,  G11B19/28 ,  G11B20/00 ,  G11B20/10 ,  G11B20/18 ,  G11B20/22 ,  H01L21/00

Abstract: PROBLEM TO BE SOLVED: To accelerate the rising/falling speed of a current applied to a write head by providing a switch connected to a current source that keeps the current at a prescribed value and by-passing the current source by this switch during the period of changing a current. SOLUTION: The current level of a write head is set by a reference current source 206a, 206b during the time of the unchanging a current (other than the rising/falling time). During the time when the current is changed such as at the rising/falling time, a transistor 214b is turned 'on' by a voltage source 216b, and switched on, and a low resistance pass to the grand is provided, and a current mirror source 212b is shunted. As a result, the transistor 214b receives the control of the current, the current is made to flow through the transistor 214b rather than through the current mirror source 212b. Then, when the current no longer changes essentially, the transistor 214b is turned 'off'.

公开(公告)号：DE69929730T2

公开(公告)日：2006-09-21

申请号：DE69929730

申请日：1999-07-06

Applicant: INFINEON TECHNOLOGIES CORP

Inventor： CANARIO RONALD A

IPC: G11B5/02 ,  G11B5/09 ,  G11B5/03 ,  G11B19/28 ,  G11B20/00 ,  G11B20/10 ,  G11B20/18 ,  G11B20/22 ,  H01L21/00

Abstract: Embodiments of the present invention present preamplifier write circuits for increasing the speed at which a write head (202, 202', 202'') in a disk drive assembly writes to a memory, such as a magnetic disk memory. The embodiments of the present invention increase the speed at which currents through the write head (202, 202', 202'') rise (10a) and fall (10b). According to embodiments of the present invention, a current source (206a, 206b, 212a, 212b, 206a', 206b', 212a', 212b', 206a'', 206b'', 212a'', 212b'') in the write circuit is bypassed during rise (10a) and fall (10b) times. Bypassing the current source (206a, 206b, 212a, 212b, 206a', 206b', 212a', 212b', 206a'', 206b'', 212a'', 212b'') increases the voltage across the write head (202, 202', 202''), increasing in the rise (10a) / fall (10b) speed of the current pulses applied to the write head (202, 202', 202''). The embodiments of the present invention allow data to be written faster than conventional write circuits. Accordingly, the density of the data stored on disk is increased.

公开(公告)号：DE69929730D1

公开(公告)日：2006-04-20

申请号：DE69929730

申请日：1999-07-06

Applicant: INFINEON TECHNOLOGIES CORP

Inventor： CANARIO RONALD A

IPC: G11B5/02 ,  G11B5/09 ,  G11B5/03 ,  G11B19/28 ,  G11B20/00 ,  G11B20/10 ,  G11B20/18 ,  G11B20/22 ,  H01L21/00

Abstract: Embodiments of the present invention present preamplifier write circuits for increasing the speed at which a write head (202, 202', 202'') in a disk drive assembly writes to a memory, such as a magnetic disk memory. The embodiments of the present invention increase the speed at which currents through the write head (202, 202', 202'') rise (10a) and fall (10b). According to embodiments of the present invention, a current source (206a, 206b, 212a, 212b, 206a', 206b', 212a', 212b', 206a'', 206b'', 212a'', 212b'') in the write circuit is bypassed during rise (10a) and fall (10b) times. Bypassing the current source (206a, 206b, 212a, 212b, 206a', 206b', 212a', 212b', 206a'', 206b'', 212a'', 212b'') increases the voltage across the write head (202, 202', 202''), increasing in the rise (10a) / fall (10b) speed of the current pulses applied to the write head (202, 202', 202''). The embodiments of the present invention allow data to be written faster than conventional write circuits. Accordingly, the density of the data stored on disk is increased.

公开(公告)号：SG74153A1

公开(公告)日：2000-07-18

申请号：SG1999003494

申请日：1999-07-21

Applicant: INFINEON TECHNOLOGIES CORP

Inventor： CANARIO RONALD A

IPC: G11B5/09 ,  G11B5/02 ,  G11B5/03 ,  G11B19/28 ,  G11B20/00 ,  G11B20/10 ,  G11B20/18 ,  G11B20/22 ,  H01L21/00

Abstract: Embodiments of the present invention present preamplifier write circuits for increasing the speed at which a write head (202, 202', 202'') in a disk drive assembly writes to a memory, such as a magnetic disk memory. The embodiments of the present invention increase the speed at which currents through the write head (202, 202', 202'') rise (10a) and fall (10b). According to embodiments of the present invention, a current source (206a, 206b, 212a, 212b, 206a', 206b', 212a', 212b', 206a'', 206b'', 212a'', 212b'') in the write circuit is bypassed during rise (10a) and fall (10b) times. Bypassing the current source (206a, 206b, 212a, 212b, 206a', 206b', 212a', 212b', 206a'', 206b'', 212a'', 212b'') increases the voltage across the write head (202, 202', 202''), increasing in the rise (10a) / fall (10b) speed of the current pulses applied to the write head (202, 202', 202''). The embodiments of the present invention allow data to be written faster than conventional write circuits. Accordingly, the density of the data stored on disk is increased.