Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1998-03-04
2000-11-14
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 67, G11B 5035, G11B 502
Patent
active
061478288
ABSTRACT:
A hard disk drive system (10) includes a read/write head (21) for reading and writing data to and from a rotating magnetic disk (12). The read/write head includes a portion which is a magneto-resistive read head (36), the output of which is supplied through a preamplifier (26) to a read channel circuit (27). The read head has a nonlinear transfer function. The read channel circuit includes an asymmetry compensation circuit (62), which generates an analog compensation signal by squaring an output signal from the read head and scaling by an asymmetry factor (.alpha.'). The analog compensation signal is combined with the analog output signal in order to obtain a corrected analog signal, which is substantially free of the distortion introduced by the read head.
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Wilson, et al., "Linearizing the Read Process for Write Nonlinearity Measurements", 3 unnumbered pages, 1997.
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Bloodworth Bryan E.
Choi Davy H.
De Veirman Geert A.
Siniscalchi Patrick P.
Brady III Wade James
Kim W. Chris
Swayze, Jr. W. Daniel
Telecky Jr. Frederick J.
Texas Instruments Incorporated
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