Data storage device using windowed delta-sigma analog-to-digital converter in digital current control loop
AssigneeWestern Digital Technologies, Inc.
InventorsJaesoo Byoun, Naoyuki Kagami, Gaku Ikedo
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Abstract
A data storage device is disclosed comprising a voice coil motor (VCM) configured to actuate a head over a disk. The data storage device further comprises control circuitry comprising a digital current control loop including a windowed delta-sigma analog-to-digital converter (ADC) configured to control the VCM. A vibration of the data storage device is measured, and at least one of a gain or a window of the windowed delta-sigma ADC is configured based on the measured vibration.
Claims20
A data storage device comprising:
- a disk;
- a head;
- a voice coil motor (VCM) configured to actuate the head over the disk;
- control circuitry comprising a digital current control loop including a windowed delta-sigma analog-to-digital converter (ADC) configured to control the VCM, wherein the control circuitry is configured to:
- measure a vibration of the data storage device;
- and
- configure at least one of a gain or a window of the windowed delta-sigma ADC based on the measured vibration.
A windowed delta-sigma analog-to-digital converter (ADC) comprising:
- a plurality of comparators configured to compare an input value to respective thresholds;
- a plurality of resistors configured to generate the thresholds, wherein the resistors define a window of the windowed delta-sigma ADC;
- a plurality of registers each configured to store a multibit value corresponding to one of the thresholds, wherein the multibit values define a gain of the windowed delta-sigma ADC;
- and
- a low pass filter configured to filter the multibit values.
A data storage device comprising:
- a disk;
- a head;
- a voice coil motor (VCM) configured to actuate the head over the disk;
- a digital current control loop including a windowed delta-sigma analog-to-digital converter (ADC) configured to control the VCM;
- a means for measuring a vibration of the data storage device;
- and
- a means for configuring at least one of a gain or a window of the windowed delta-sigma ADC based on the measured vibration.
Dependencies are inferred from the claim text.