Texas Instruments Corporation

William Martin Torres Escajadillo

Reza Sharifi

Rida Shawky Assaad

Mark A Wolfe

Pankaj Pandey

A system and method for Flex Over or On Suspension (FOS) fault detection under a write gate for magnetic disk drives may employ a flex over suspension fault comparator that compares a predetermined reference threshold to a positive delta of a disk drive write head data stream and outputs a positive or negative FOS fault indication. A max/min buffer detects polarity of a disk drive read/write head and applies a positive buffered delta to the fault comparator. A transition-free window detector triggers the fault comparator to output the fault indication when a transition-free window of zero-value data bits of a predetermined length is detected from the disk drive head, and the transition-free window detector provides a fault validation signal to validate output of the fault comparator when the transition-free window of zero-value data bits of the predetermined length is detected from the disk drive head.

Flex over suspension fault detection under a write gate for magnetic disk drives

Systems and methods are disclosed that can be used to control an output signal, such as for controlling a heater for a hard disk drive. A system can include a pre-driver configured to provide a pulse-width modulated (PWM) signal to an output system in response to a control signal and a feedback signal, the output system being configured to provide an output signal for driving a load, the pre-driver comprising a modulator that provides the PWM signal in response to the control signal and a filtered feedback signal. A low pass filter is configured to receive a feedback signal with a voltage corresponding to a voltage of the output signal, wherein the low pass filter provides the filtered feedback signal that controls a frequency of the PWM signal to the modulator, the low pass filter having a bulk driven operational transconductance amplifier.

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Dallas, TX, United States of America

William Martin Torres Escajadillo