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AssigneeSTMicroelectronics S.r.l.
InventorsGiuseppe Patti, Gilles Denoyer, Roberto Alini
Estimating the term…
An apparatus (and method) is provided that reduces thermal interference in the read signal of a disk drive. A variable or programmable resistance is used to change the transfer function of a filter in the read channel of the disk drive to filter the read signal. The filter has a first transfer function (first cut-off frequency) related to the programmed resistance during normal operation of the disk drive (i.e. when thermal interference is not detected). When thermal interference is detected in the read signal, the resistance is programmed to another value resulting in the filter having a second transfer function (second cut-off frequency). The resistance element includes a transconductance amplifier whose transconductance is variable or programmable to different values resulting in different programmable transfer functions (or one of a multitude of cut-off frequencies) for the filter. In the preferred embodiment, detection of thermal interference increases the cut-off frequency of the filter thereby filtering, or reducing the effects of, the thermal interference in the read signal.
A thermal event recovery circuit for filtering a read signal from a read head in a disk drive, the circuit comprising:
A thermal event recovery circuit for filtering a read signal from a read head in a disk drive, the circuit comprising:
A circuit for detecting thermal interference and filtering a read signal from a read head in a disk drive, the circuit comprising:
A disk drive comprising:
A method of reducing the affects of a thermal asperity on a read signal in a disk drive, comprising the steps of:
A thermal event recovery circuit for filtering a read signal from a read head in a disk drive, the circuit comprising:
A thermal event recovery circuit for filtering a read signal from a read head in a disk drive, the circuit comprising:
A disk drive comprising:
Dependencies are inferred from the claim text.