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US 12,183,376 B1Granted
Data read synchronization from phase modulated synchronization fields in a data storage device
AssigneeWestern Digital Technologies, Inc.
InventorsRichard Galbraith, Jonas Goode, Niranjay Ravindran, Iouri Oboukhov
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Abstract
Example channel circuits, data storage devices, and methods for data read synchronization from phase modulated synchronization fields are described. A data synchronization detector may receive an oversampled digital read signal read from a synchronization field that uses a single written pattern to encode the start of data position, phase, and gain for the read channel. The write pattern may use a phase modulated carrier signal to encode a pseudo-random binary sequence indicating the start of data position.
Claims20
A channel circuit, comprising:
- a data synchronization detector circuit comprising at least one correlator circuit and configured to:
- receive a digital read signal comprising a plurality of samples from a synchronization field, wherein the synchronization field comprises a written pattern for a phase modulated carrier signal;
- determine, using the at least one correlator circuit, a start of data position from the plurality of samples;
- determine, using the at least one correlator circuit, a phase value from the plurality of samples;
- and
- determine, using the at least one correlator circuit, a gain value from the plurality of samples.
3 more elements
A channel circuit, comprising:
- a data synchronization detector circuit configured to:
- receive a digital read signal comprising a plurality of samples from a synchronization field, wherein:
- the synchronization field comprises a written pattern for a phase modulated carrier signal;
- and
- the written pattern comprises a pseudo random binary sequence;
- determine a start of data position from the pseudo random binary sequence;
- determine a phase value from the plurality of samples;
- and
- determine a gain value from the plurality of samples.
6 more elements
A channel circuit, comprising:
- a data synchronization detector circuit configured to:
- receive a digital read signal comprising a plurality of samples from a synchronization field, wherein:
- the synchronization field comprises a written pattern for a phase modulated carrier signal;
- the phase modulated carrier signal is based on a series of sets of magnetic domains having a segment length;
- the sets of magnetic domains comprise a field polarity transition;
- and
- a direction of offset of the field polarity transition from a center of the segment length determines a bit value in the write pattern;
- determine a start of data position from the plurality of samples;
- determine a phase value from the plurality of samples;
- and
- determine a gain value from the plurality of samples.
8 more elements
A method comprising:
- generating, from a non-volatile storage medium, an analog read signal;
- and
- determining, by an analog-to-digital converter, a digital read signal from the analog read signal by oversampling the analog read signal at a multiple of a baud rate of a channel circuit, wherein:
- an oversample rate of the analog-to-digital converter is at least two times the baud rate;
- the digital read signal comprises a plurality of samples from a synchronization field;
- and
- the synchronization field comprises a written pattern for a phase modulated carrier signal;
- determining a start of data position from the plurality of samples;
- determining a phase value from the plurality of samples;
- and
- determining a gain value from the plurality of samples.
8 more elements
A data storage device comprising:
- a non-volatile storage medium;
- a channel circuit;
- means for receiving a digital read signal comprising a plurality of samples from a synchronization field, wherein the synchronization field comprises a written pattern for a phase modulated carrier signal;
- means for determining a start of data position from the plurality of samples;
- means for determining a phase value from the plurality of samples;
- means for determining a gain value from the plurality of samples;
- and
- means for detecting, responsive to the start of data signal, data encoded in data samples in the digital read signal following the plurality of samples from the synchronization field, wherein the data samples are based on the phase value and the gain value.
5 more elements
Dependencies are inferred from the claim text.