Dustin M Cvancara

6341048, Jan 22, 2002

Jan 20, 2000

09/488377

John C. Morris - Minneapolis MN
Dustin M. Cvancara - Minneapolis MN

Seagate Technology LLC - Scotts Valley CA

G11B 2110

360 7708, 360 75

A method and apparatus are provided for positioning a head based on a control signal and a cancellation signal. In the method and apparatus, a sensor located in the disc drive is capable of generating sensor data samples at a sensor data rate that is different from a servo data rate. A data enlarger inserts additional data samples between the sensor data samples to produce enlarged data that is filtered to produce filtered data, which is decimated to form decimated sensor data at the servo data rate. A cancellation component converts the decimated sensor data into a cancellation signal that may be combined with a control signal to control the actuator. A sensor chip is also provided that includes a sensing element and a sigma-delta circuit that cooperate to generate sensor samples at a sensor data rate and a buffer that stores sensor samples at the sensor data rate.

63111403, Oct 30, 2001

Nov 27, 2000

9/723358

John C. Morris - Minneapolis MN
Dustin M. Cvancara - Minneapolis MN

Seagate Technology LLC - Scotts Valley CA

G01P 1508

702141

A sensor chip is provided that includes a sensing element and a sigma-delta circuit that cooperate to generate sensor samples at a sensor data rate and a buffer that stores sensor samples at the sensor data rate. Although the buffer stores the samples at the sensor data rate, it is capable of providing the samples to an external circuit at a higher data rate. In one embodiment, the sensor chip is able to provide the stored sensor samples to an off-chip component at a rate set by the off-chip component.