Asymmetry correction circuit
AssigneeIBM Corporation
InventorsSudhir M. Gowda, Scott K. Reynolds
Life of this patent
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Abstract
A technique for converting asymmetric waveforms into symmetric ones. The technique is used in disk drive read channels which receive asymmetric waveforms from magnetoresistive heads. Conversion of these waveforms into symmetric ones results in improved bit error rate of the read channel. The correction technique can be used for any general asymmetry transfer function, and in any general application where the correction of asymmetric waveforms is needed. The technique involves splitting the input signal into two rectified paths and applying correction independently on each of the paths.
Claims20
An apparatus for correcting asymmetric waveforms, said apparatus comprising:
- an input arrangement which accepts an input signal, the input signal having an associated waveform;
- a splitting arrangement which splits the input signal into at least two paths;
- a first altering arrangement, associated with a first of said two signal paths, which alters a first portion of the split signal;
- a second altering arrangement, associated with a second of said two signal paths, which alters a second portion of the split signal;
- and
- an output arrangement which recombines the altered split signals into an output signal;
- whereby the output signal exhibits a substantially symmetric waveform.
A method of correcting asymmetric waveforms, said method comprising the steps of:
- accepting an input signal, the input signal having an associated waveform;
- splitting the input signal into at least two portions;
- altering a first portion of the split signal;
- altering a second portion of the split signal;
- and
- recombining the altered split signals into an output signal;
- whereby the output signal exhibits a substantially symmetric waveform.
Dependencies are inferred from the claim text.