Texas Instruments Corporation

Taras Vasylyovych Dudar

Rajarshi Mukhopadhyay

Bryan E Bloodworth

Reza Sharifi

Ashish Manjrekar

Pankaj Pandey

Rajkumar Jayaraman

Seungwoo Jung

Matthew Ghaleb Sunna

Glauco Rizzo

A device for setting a bias for a magneto-resistive (MR) head can include a counter configured to provide a count value that varies incrementally from a first count value to a maximum count value. Logic is configured to determine at least one of whether the bias for the MR head has reached a predetermined threshold and whether the counter has reached the maximum count value. The logic provides a bias output signal corresponding to the count value for setting the bias of the MR head according to the determination by the logic.

System and method for setting bias for MR head

A current switching system is described. This system includes first and second mirrored devices coupled to each other and a coupled terminal, and the first and second mirrored devices are coupled to an input terminal and an output terminal; a storage element in element in parallel with the first mirrored device and the first degeneration device; a variable impedance device coupled between the coupled terminal and a low voltage device; and a current mirroring accuracy enhancing circuit coupled between the coupled terminal and a high voltage device, wherein the variable impedance device dynamically changes a current at the coupled terminal to a second level depending when a threshold is met, and an impedance on the coupled terminal remains low both before switching and during switching.

Current switching system

Methods and apparatus for proximity detection of hard disk drive read heads are disclosed. A disclosed method comprises forming a first signal having a frequency, a first amplitude, and a first offset voltage, forming a second offset voltage substantially equal to the first offset voltage from the first signal, amplifying the amplitude of the first signal to cause the resonant signal to have a second amplitude greater than the first, and forming a second signal having a frequency indicative of the location of a read head relative to a platter of a hard disk drive.

Methods and apparatus for proximity detection of hard disk drive read heads

Growing community of inventors

Plano, TX, United States of America

Taras Vasylyovych Dudar