Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Reexamination Certificate
2007-04-24
2007-04-24
Korzuch, William (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
Reexamination Certificate
active
10402063
ABSTRACT:
A variable read output impedance control circuit of the present invention includes a variable impedance circuit as the output impedance of a magnetic media storage system. Preferably, the variable impedance circuit includes one or more diodes. The diodes are preferably coupled in series, to provide the output impedance of the magnetic media storage system. The impedance of the diodes is variable based on the amount of bias current that is provided to the diodes. The bias current is provided to the diodes from a current source preferably controlled by a controller circuit. By varying the amount of current provided to the diodes, the impedance of the diodes is adjusted. Accordingly, the read output impedance of the magnetic media storage system is controlled by controlling the bias current provided to the diodes. The range of impedance values provided by the read output impedance control circuit of the present invention is varied by including an appropriate number of diodes within the variable impedance circuit. Preferably, the magnetic media storage system is a hard disk drive.
REFERENCES:
patent: 4021749 (1977-05-01), Ishigaki et al.
patent: 4523238 (1985-06-01), Keel et al.
patent: 5060089 (1991-10-01), Cleveland
patent: 5101117 (1992-03-01), Johnson et al.
patent: 5282094 (1994-01-01), Ngo
patent: 5287231 (1994-02-01), Shier et al.
patent: 5386328 (1995-01-01), Chiou et al.
patent: 5392172 (1995-02-01), Yoshinaga et al.
patent: 5612828 (1997-03-01), Brannon et al.
patent: 5841603 (1998-11-01), Ramalho et al.
patent: 5867334 (1999-02-01), Soichi et al.
patent: 5956281 (1999-09-01), Nakai et al.
patent: 6128146 (2000-10-01), Ngo
patent: 6211709 (2001-04-01), Kim
patent: 6246269 (2001-06-01), Schuler et al.
patent: 6256157 (2001-07-01), Biskeborn et al.
patent: 6271978 (2001-08-01), Block et al.
patent: 6519103 (2003-02-01), Cyrusian
patent: 6696896 (2004-02-01), Kuehlwein et al.
patent: 6697205 (2004-02-01), Cyrusian et al.
patent: 0 758 782 (1997-02-01), None
patent: 3-187006 (1991-08-01), None
patent: 5-290309 (1993-11-01), None
Sedra/Smith, “Microelectronics Circuits”, 1998, Oxford University Press, 4 th. Edition, pp. 122, 155-157, 163-167, 221-229-233.
Patent Abstracts of Japan, Pub. No. 62183006, Nov. 8, 1987.
Haverstock & Owens LLP
Korzuch William
Negrón Daniell L.
Sony Corporation
Sony Electronics Inc.
LandOfFree
Variable read output impedance control circuit for a... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable read output impedance control circuit for a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable read output impedance control circuit for a... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3723572