Seagate Technology Incorporated

Michael Dickeson

Brian Dean Boling

Tuan Van Tran

David Finamore

David Michael Freson

Frank P Domingo, Jr

Naveen Viswanath

Methods of tuning a notch filter to remove resonant frequency components from an output signal of a vibration sensor. Some methods according to the invention include exciting the vibration sensor with an excitation signal including energy in a frequency band that may include a resonant frequency of the vibration sensor, measuring the output signal of the vibration sensor in response to the excitation signal, detecting a frequency component of the output signal that corresponds to the resonant frequency of the vibration sensor, and configuring the notch filter to attenuate the detected frequency component. Related disk drives are also disclosed.

Sensor resonant frequency identification and filter tuning

A controller includes a hysteretic circuit that provides a first ON level pulse when a corresponding first negative regulated voltage rises above a respective first voltage threshold. Similarly, a second ON level pulse is provided when a corresponding second positive regulated voltage falls below a respective second voltage threshold. The hysteretic circuit provides an OFF level pulse when one of first and second switch currents increases above a current threshold. A switch control circuit receives the first and second ON level pulses and the OFF level pulse, and provides first and second switch control outputs to separately regulate the first and second regulated voltages.

Quasi-continuous voltage regulator with dual polarity outputs

A clamping circuit is included in a phased motor control circuit, particularly on an electrical connection connected to at least one electrostatic discharge cell and/or the driver control electronics of the phased motor control circuit. The clamping circuit triggers when a voltage that exceeds a clamping turn-on threshold occurs on the electrical connector, sourcing or sinking the discharge current so as to protect the electrostatic discharge cells and/or driver control electronics from destruction by said discharge current.

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Westminster, CO, United States of America

Michael Dickeson