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| Number | Title | Issue Date |
| 8149531 | Electrostatic discharge protection circuit for magneto-resistive read elements A read head circuit includes a read element configured to read data stored magnetically on a platter. The read element includes a first terminal and a second terminal. A normally-ON transistor includes a first terminal, a second terminal and a control terminal. The ... | 04/03/2012 |
| 8107182 | Systems and methods for accessing read channel registers using commands on data lines A system and method for providing an interface an interface between a read channel and a disk controller. The interface includes a plurality of differential pair signal lines operable to communicate data and control signals between the read channel and the hard disk... | 01/31/2012 |
| 7982998 | Communications channel with programmable coupling A communications circuit includes a first filter having a corner frequency that is adjustable. A data type identifier that tracks first and second types of data flowing through the communications circuit. A control module that adjusts the corner frequency of the fir... | 07/19/2011 |
| 7940488 | Storage device and gain adjusting device An amplifier amplifies, according to a first gain value, a first input signal acquired by reproducing first information from first areas having the first information recorded therein area by area in order. The amplifier also amplifies, according to a second gain val... | 05/10/2011 |
| 7929241 | Signal conversion system and method A signal conversion circuit includes: an input circuit that rejects common mode inputs and is configured to receive a differential input signal and shift a first bias of the differential input signal to produce a single ended intermediate signal with a second bias; ... | 04/19/2011 |
| 7881000 | Method of setting up a pre-amplifier for hard disk drive and hard disk drive incorporating the same A method of setting up a pre-amplifier for a hard disk drive and a hard disk drive incorporating the method. A serial interfacing mode of the pre-amplifier is checked by writing and reading data to/from the pre-amplifier. A chip ID of the pre-amplifier is checked an... | 02/01/2011 |
| 7881001 | Method and system for canceling feedback current in an amplifier system A method for providing feedback current cancellation comprises providing an amplifier with an input, an output, and at least one stage, feeding back a first current based on the output of the amplifier to the input of the amplifier, and substantially cancelling the ... | 02/01/2011 |
| 7876520 | Programmable high pass amplifier for perpendicular recording systems A system comprises a read element, a first differential amplifier, and a second differential amplifier including inputs that communicate with outputs of the first differential amplifier. First and second resistances communicate with the inputs of the first different... | 01/25/2011 |
| 7872825 | Data storage drive with reduced power consumption A data storage drive comprises a storage disk, a read/write head, and signal processing circuitry in signal communication with the read/write head. The read/write head is operative to read data from and write data to the storage disk at a plurality of data transfer ... | 01/18/2011 |
| 7869153 | Self servo write tune feature for preamps A system includes N channels and a control module. Each of the N channels includes a latch and a signal generator module, where N is an integer greater than 1. The latch selectively latches a B-bit codeword, where B is an integer greater than 1. The signal generator... | 01/11/2011 |
| 7864477 | Circuits, architectures, apparatuses, systems, algorithms and methods and software for automatic gain calibration of a burst signal stream Apparatuses, circuitry, architectures, systems, methods, algorithms and software for performing automatic gain calibration on an input signal. The apparatuses and/or circuits generally include an amplifier, a filter, a comparator, and a controller. The amplifier is ... | 01/04/2011 |
| 7855849 | Methods and apparatus for temperature compensation for hard disk drive write overshoot current Methods and apparatus for temperature compensation for hard disk drive writer overshoot current are disclosed. A disclosed system comprises creating a first delay based on the temperature of the hard disk drive, creating a second delay based on the temperature of th... | 12/21/2010 |
| 7852591 | Electrostatic discharge protection circuit for magneto-resistive read elements A read head circuit comprises a read element including first and second terminals. A shunting device comprises a transistor including a first terminal that is connected to the first terminal of the read element, a second terminal that is connected to the second term... | 12/14/2010 |
| 7848044 | VCM driver and PWM amplifier The present invention provides a VCM driver realizing low power consumption and high accuracy and a PWM amplifier compensating a dead time distortion. A phase compensator, a ΔΣ modulator receiving an output signal of the phase compensator and converting the output... | 12/07/2010 |
| 7830633 | Amplitude level controller for head IC, read circuit and media storage device A head IC adjusts an amplitude level of a read signal of a head and outputs to a read channel having an AGC amplifier, includes an AGC amplifier. The AGC amplifier has a feedback loop control type first amplifier and a feed-forward control type second amplifier. The... | 11/09/2010 |
| 7821734 | Head IC, read circuit and medium storage device A head IC adjusts an amplitude level of a read signal of a head to adjust dispersion of the output characteristic of the head and to adjust the read signal within the input dynamic range of the AGC of a read channel. An AGC amplifier is installed in a head IC connec... | 10/26/2010 |
| 7787206 | Systems and methods for accessing preamp registers using commands via read channel/hard disk controller interface A system and method for providing an interface between a read channel and a disk controller. The interface includes a plurality of differential pair signal lines operable o communicate data and control signals between the read channel and the hard disk controller. T... | 08/31/2010 |
| 7773332 | Long hold time sample and hold circuits A sample and hold circuit is disclosed that provides longer hold times. The sample and hold circuit can be used in a disc drive to provide improved read-to-write and write-to-read mode transitions. The sample and hold circuit has an input and an output, and includes... | 08/10/2010 |
| 7751140 | TMR/GMR amplifier with input current compensation A system includes an amplifier and a feedback network that includes a first resistance having one end that communicates with an input of the amplifier and an opposite end that communicates with an output of the amplifier. A first replica circuit provides a replica o... | 07/06/2010 |
| 7746590 | Current mirrors having fast turn-on time A current mirror circuit providing a fast turn on time. A node within the circuit is held at a first voltage when the current mirror is off to permit the node voltage to quickly reach a necessary value when the current mirror circuit is turned on. ... | 06/29/2010 |
| 7724460 | Magneto-resistive head resistance sensor A recording system employing a magneto-resistive (MR) element senses a resistance value of the MR element and generates one or more MR resistance (MRR) signal values based on the sensed MR element resistance value. The MRR signal values might be, for example, curren... | 05/25/2010 |
| 7710678 | VCM driver and PWM amplifier The present invention provides a VCM driver realizing low power consumption and high accuracy and a PWM amplifier compensating a dead time distortion. A phase compensator, a ΔS modulator receiving an output signal of the phase compensator and converting the output ... | 05/04/2010 |
| 7710679 | Communications channel with programmable coupling A communications circuit includes a first filter having a corner frequency that is adjustable. A data type identifier that tracks first and second types of data flowing through the communications circuit. A control module that adjusts the corner frequency of the fir... | 05/04/2010 |
| 7675704 | Magnetoresistive head preamplifier circuit with programmable input impedance A preamplifier circuit for a disk drive system is disclosed. The preamplifier circuit has first and second inputs that sense the voltage on either side of a magnetoresistive (MR) head element, which presents a varying resistance according to the localized magnetic f... | 03/09/2010 |
| 7667916 | Signal conversion system and method Apparatus, systems, and methods implementing techniques for converting a signal. In an apparatus form, an input circuit receives a differential input signal and produces a single-ended intermediate signal. An amplifier circuit receives the intermediate signal and pr... | 02/23/2010 |
| 7633699 | CPP reader with phase detection of magnetic resonance for read-back An apparatus includes a magnetically biased multilayer structure having a reference layer and a free layer separated by a spacer layer; a DC current source connected to the multilayer structure; an AC current source connected to the multilayer structure; and a phase... | 12/15/2009 |
| 7605993 | Write current boosted head amplifier Embodiments in accordance with the present invention provide a disk drive and a control method in the disk drive which can obtain good recording performance by amplifying the write current according to the recording method and the recording frequency. A HDD in accor... | 10/20/2009 |
| 7564638 | Preamplifier circuit and method for a disk drive device An amplifying circuit and method are disclosed for amplifying electrical signals, such as electrical signals generated by the read head of a disk drive. The circuit includes a pair of cross-coupled differential amplifier circuits. Each differential amplifier circuit... | 07/21/2009 |
| 7558014 | Programmable high pass amplifier for perpendicular recording systems A high pass amplifier comprises a first amplifier including an input and an output. A second amplifier includes an input that communicates with the output of the first amplifier and an output. A first resistance includes a first end that communicates with the input ... | 07/07/2009 |
| 7551384 | Systems and methods for calibrating a read/write channel of a hard disk drive A read/write channel for a hard disk drive comprising at least one analog read component and a fly height control system. The fly height control system controls fly height based on a current fly height value generated based on a fly height measurement signal that pa... | 06/23/2009 |
| 7551383 | Adjusting voltage delivered to disk drive circuitry based on a selected zone A disk drive includes a disk comprising a plurality of zones, a clock for generating a timing signal having a timing frequency, a voltage controller for providing a supply voltage, and circuitry coupled to the supply voltage and responsive to the timing frequency. P... | 06/23/2009 |
| 7551382 | Digital device configuration and method A digital Storage Element is described. A device is configured including a Storage Element for access by a user responsive to a native control code. A processing arrangement executes a control program for controlling the overall device and executing at least a porti... | 06/23/2009 |
| 7532427 | TMR/GMR amplifier with input current compensation An amplifier system with feedback current cancellation comprises an amplifier with at least one stage, a feedback network, first and second replica circuits, a buffer, second and third resistances, an operational amplifier (op-amp), a transistor, and a current mirro... | 05/12/2009 |
| 7529053 | TMR/GMR amplifier with input current compensation An amplifier system with feedback current cancellation comprises an amplifier, a feedback network, an operational amplifier (op-amp), and second, third, and fourth resistances. The amplifier includes an input, an output, and at least one stage. The feedback network ... | 05/05/2009 |
| 7522368 | Differential voice coil motor control A disk drive controller including a differential voice coil motor control function is disclosed. The differential voice coil motor control function includes an on-chip compensation network for the inner control loop, including a resistor formed of one or more MOS tr... | 04/21/2009 |
| 7508613 | Method and apparatus for balanced shield shunts, leads and pads for electrical noise reduction in read heads A symmetrical read element circuit for reducing electrical and magnetic noise using signal processing, such as a differential preamplifier. The circuits are symmetrically created on both sides of the read element so that the noise is balanced on both sides of the re... | 03/24/2009 |
| 7417817 | Write driver circuit for magnetic data storage systems A write driver circuit for a magnetic storage medium includes a first write driver sub-circuit that has an output that communicates with a first node of a write head. The first write driver circuit includes a first driver circuit and a first feedback path between th... | 08/26/2008 |
| 7414804 | TMR/GMR amplifier with input current compensation An amplifier system with feedback current cancellation comprises an amplifier with an input, an output, and at least one stage. A feedback network communicates with the input and output of the amplifier. A feedback current cancellation module that provides a first c... | 08/19/2008 |
| 7394605 | Broadband transmission path apparatus, suspension assembly and storage medium apparatus A broadband transmission path apparatus connects a head IC and a head in a suspension. Either one of the head IC and the head is assumed as a transmission terminal and the other is assumed as a reception terminal to divide a required transmission frequency band into... | 07/01/2008 |
| 7375909 | Write driver with power optimization and interconnect impedance matching A write driver for driving a write current through a write head connected to the write head by an interconnect or flexible transmission line. The write driver includes a circuit matching an output impedance of the write driver to the odd characteristic impedance of ... | 05/20/2008 |
