Patents by Inventor Jason P. Brenden
Jason P. Brenden has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 9715887Abstract: A storage system includes a magnetic write head, a magnetic storage medium, a channel circuit comprising a write data output, wherein the channel circuit is operable to process write data to be recorded on the magnetic storage medium by the magnetic write head, and a preamplifier operable to receive the write data from the channel circuit, wherein the preamplifier comprises a number of register pages configured to store pattern dependent write current characteristics for a variety of magnet lengths, and wherein the preamplifier is operable to retrieve the write current characteristics based on magnet lengths and to record data bits on the magnetic storage medium using the write current characteristics.Type: GrantFiled: December 28, 2015Date of Patent: July 25, 2017Assignee: AVAGO TECHNOLOGIES GENERAL IP (SINGAPORE) PTE. LTD.Inventors: Ross S. Wilson, Peter J. Windler, Bruce A. Wilson, Jaydip Bhaumik, Scott M. O'Brien, Jason P. Brenden, Jeffrey A. Gleason, Cameron C. Rabe
-
Publication number: 20170186448Abstract: A storage system includes a magnetic write head, a magnetic storage medium, a channel circuit comprising a write data output, wherein the channel circuit is operable to process write data to be recorded on the magnetic storage medium by the magnetic write head, and a preamplifier operable to receive the write data from the channel circuit, wherein the preamplifier comprises a number of register pages configured to store pattern dependent write current characteristics for a variety of magnet lengths, and wherein the preamplifier is operable to retrieve the write current characteristics based on magnet lengths and to record data bits on the magnetic storage medium using the write current characteristics.Type: ApplicationFiled: December 28, 2015Publication date: June 29, 2017Inventors: Ross S. Wilson, Peter J. Windler, Bruce A. Wilson, Jaydip Bhaumik, Scott M. O'Brien, Jason P. Brenden, Jeffrey A. Gleason, Cameron C. Rabe
-
Patent number: 9525405Abstract: A method for reducing common-mode disturbances during power-on and power-off modal transitions in a current driver includes providing a programmable current source operative to generate a current having a controllable rise-time and controlling the programmable current source such that a rise-time of the current generated by the current driver is set to a first rise-time value during power-on and power-off modes of operation and is set to a second rise-time value during polarity transitions in a data mode of operation of the current driver, the first rise-time value being greater than the second rise-time value.Type: GrantFiled: January 29, 2015Date of Patent: December 20, 2016Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: Joseph D. Stenger, Cameron C. Rabe, Jason P. Brenden
-
Patent number: 9437219Abstract: An apparatus for two-dimensional magnetic recording includes a storage medium, an array of magnetoresistive read heads disposed adjacent the storage medium and spaced to read a data track, a number of leads connected to the array of magnetoresistive read heads, and number of bias circuits connected to the array of read heads by the leads. The bias circuits can be configured to independently bias each of the array of read heads with the array of read heads connected in series or in parallel.Type: GrantFiled: September 10, 2015Date of Patent: September 6, 2016Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: Ross S. Wilson, Scott M. O'Brien, Jeffrey A. Gleason, Jason P. Brenden, Jaydip Bhaumik, David Fitzgerald
-
Patent number: 9431050Abstract: An apparatus for two-dimensional magnetic recording includes an array reader with a number of magnetoresistive read sensors configured to read data from a storage medium. The magnetoresistive read sensors have a number of connection terminals, with at least one of the connection terminals being shared by more than one of the magnetoresistive read sensors. The apparatus also includes a number of low-noise amplifiers connected to the connection terminals, each configured to amplify a differential signal from a different one of the magnetoresistive read sensors. The apparatus also includes a number of impedance balancing networks connected to a subset of the connection terminals.Type: GrantFiled: October 30, 2015Date of Patent: August 30, 2016Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: Jason P. Brenden, David Fitzgerald, Jeffrey A. Gleason, Scott M. O'Brien, Michael Straub, Ross S. Wilson
-
Publication number: 20160204771Abstract: A method for reducing common-mode disturbances during power-on and power-off modal transitions in a current driver includes providing a programmable current source operative to generate a current having a controllable rise-time and controlling the programmable current source such that a rise-time of the current generated by the current driver is set to a first rise-time value during power-on and power-off modes of operation and is set to a second rise-time value during polarity transitions in a data mode of operation of the current driver, the first rise-time value being greater than the second rise-time value.Type: ApplicationFiled: January 29, 2015Publication date: July 14, 2016Inventors: Joseph D. Stenger, Cameron C. Rabe, Jason P. Brenden
-
Patent number: 9343082Abstract: Various embodiments of the present invention provide systems and methods for determining contact with a storage medium. As an example, a data storage system is disclosed that includes: a head assembly and a data processing circuit. The head includes a head disk interface sensor operable to provide a contact signal indicating contact between the head and a storage medium disposed in relation to the head. The data processing circuit is operable to process the contact signal to yield an indication of a contact between the storage medium and the head.Type: GrantFiled: March 30, 2010Date of Patent: May 17, 2016Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.Inventors: Harley Burger, David Fitzgerald, Jason P. Brenden, Stephen Kuehne
-
Patent number: 9099137Abstract: Amplifier architectures are provided for current sensing applications. An amplifier includes a load device, an operational amplifier, a current source, and a bipolar transistor. The operational amplifier has a first input terminal connected to a first input node that receives an input current, and a second input terminal connected to a second input node that receives a reference voltage. The current source is connected to an output of the operational amplifier. The operational amplifier, the current source, and the bipolar transistor form a feedback loop that generates and maintains a bias voltage on the first input node based on the reference voltage applied to the second input node. The bipolar transistor amplifies the input current received on the first input node, and generates an amplified input current. The load device converts the amplified input current to an output voltage, wherein the output voltage is used to sense the input current.Type: GrantFiled: May 8, 2014Date of Patent: August 4, 2015Assignee: Avago Technologies General IP (Singapore) PTE. LTDInventors: Brad A. Natzke, Cameron C. Rabe, Hong Jiang, Andrew P. Krebs, Jason P. Brenden
-
Patent number: 9064539Abstract: The present inventions are related to systems and methods for data processing, and more particularly to systems and methods for synchronizing operations in a data storage system.Type: GrantFiled: October 2, 2014Date of Patent: June 23, 2015Assignee: LSI CorporationInventors: Scott M. O'Brien, Jason P. Brenden, Cameron C. Rabe, Peter J. Windler, Joseph D. Stenger, David W. Kelly
-
Patent number: 8929013Abstract: A storage system with pattern dependent write includes a magnetic write head, a magnetic storage medium, a read channel operable to process write data to be recorded on the magnetic storage medium by the magnetic write head, and a preamplifier operable to receive the write data and an associated clock from the read channel, to generate a pattern dependent write control signal based on a pattern in the write data and on the clock, and to set a write current level through the magnetic write head to a number of different current levels based on the pattern dependent write control signal.Type: GrantFiled: November 21, 2013Date of Patent: January 6, 2015Assignee: LSI CorporationInventors: Angelo R. Mastrocola, David W. Kelly, Ross S. Wilson, Jason P. Brenden
-
Patent number: 8908730Abstract: A laser driver apparatus, system, and method include a single laser driver. One or more threshold levels and one or more undershoot levels can be digitally combined into a single output with respect to the single laser driver to reduce the output capacitance of the single laser driver and minimize circuit power, resulting in a faster and higher fidelity signal thereof. A decoder (e.g., thermometer decoding) can also be provided, wherein the threshold level(s) and the undershoot level(s) are thermometer decoded via the decoder.Type: GrantFiled: August 1, 2012Date of Patent: December 9, 2014Assignee: LSI CorporationInventors: Cameron C. Rabe, Jason P. Brenden
-
Patent number: 8824085Abstract: A heat-assisted magnetic recording system may include, but is not limited to: at least one magnetic recording read/write head; at least one laser diode configured to illuminate at least a portion of at least one magnetic recording medium; at least one laser power level sensor configured to detect a power level of the at least one laser diode; and a controller configured to modify one or more power level settings associated with the at least one laser diode in response to one or more output signals of the at least one laser power level sensor.Type: GrantFiled: November 1, 2012Date of Patent: September 2, 2014Assignee: LSI CorporationInventors: Ross S. Wilson, Jason P. Brenden, Toan V. Tran
-
Publication number: 20140240870Abstract: Amplifier architectures are provided for current sensing applications. An amplifier includes a load device, an operational amplifier, a current source, and a bipolar transistor. The operational amplifier has a first input terminal connected to a first input node that receives an input current, and a second input terminal connected to a second input node that receives a reference voltage. The current source is connected to an output of the operational amplifier. The operational amplifier, the current source, and the bipolar transistor form a feedback loop that generates and maintains a bias voltage on the first input node based on the reference voltage applied to the second input node. The bipolar transistor amplifies the input current received on the first input node, and generates an amplified input current. The load device converts the amplified input current to an output voltage, wherein the output voltage is used to sense the input current.Type: ApplicationFiled: May 8, 2014Publication date: August 28, 2014Applicant: LSI CorporationInventors: Brad A. Natzke, Cameron C. Rabe, Hong Jiang, Andrew P. Krebs, Jason P. Brenden
-
Patent number: 8792197Abstract: A hard disk drive or other storage device comprises a storage medium, a write head, and control circuitry coupled to the write head. The control circuitry comprises a write driver configured to generate a write signal comprising write pulses responsive to write data, and a driver controller configured to adjust overshoot amplitudes of respective ones of the write pulses utilizing a segmented digital-to-analog converter. The overshoot amplitudes are adjusted by detecting patterns in the write data, decoding a first portion of a base overshoot value to identify a corresponding number of base overshoot segments, combining the base overshoot value and a differential overshoot value, decoding a first portion of the combined base overshoot and differential overshoot values to identify a corresponding number of enhanced overshoot segments, and selecting between the number of base overshoot segments and the number of enhanced overshoot segments responsive to detection of a particular pattern.Type: GrantFiled: November 7, 2013Date of Patent: July 29, 2014Assignee: LSI CorporationInventors: Ross S. Wilson, Jason P. Brenden, Paul Mazur, Cameron C. Rabe, Gang Chen
-
Patent number: 8774643Abstract: A driver circuit configured to generate a drive signal for an optical source comprises an overshoot controller that provides an amount of overshoot for a given logic state of the drive signal as a function of a duration of at least one previous logic state of the drive signal. The drive signal may alternate between a first logic state associated with a first operating mode of the optical source and a second logic state associated with a second operating mode of the optical source. The overshoot controller may be configured to provide amounts of overshoot for respective instances of the first logic state that are proportional to the durations of their respective immediately preceding second logic states. The driver circuit may be implemented in a heat-assisted magnetic recording system in which the optical source alternates between on and off states associated with respective magnetic write and magnetic read modes.Type: GrantFiled: June 18, 2012Date of Patent: July 8, 2014Assignee: LSI CorporationInventors: Jason P. Brenden, Xuemin Yang, Cameron C. Rabe
-
Patent number: 8760790Abstract: Amplifier architectures are provided for current sensing applications. An amplifier includes a load device, an operational amplifier, a current source, and a bipolar transistor. The operational amplifier has a first input terminal connected to a first input node that receives an input current, and a second input terminal connected to a second input node that receives a reference voltage. The current source is connected to an output of the operational amplifier. The operational amplifier, the current source, and the bipolar transistor form a feedback loop that generates and maintains a bias voltage on the first input node based on the reference voltage applied to the second input node. The bipolar transistor amplifies the input current received on the first input node, and generates an amplified input current. The load device converts the amplified input current to an output voltage, wherein the output voltage is used to sense the input current.Type: GrantFiled: November 12, 2012Date of Patent: June 24, 2014Assignee: LSI CorporationInventors: Brad A. Natzke, Cameron C. Rabe, Hong Jiang, Andrew P. Krebs, Jason P. Brenden
-
Publication number: 20140119164Abstract: A heat-assisted magnetic recording system may include, but is not limited to: at least one magnetic recording read/write head; at least one laser diode configured to illuminate at least a portion of at least one magnetic recording medium; at least one laser power level sensor configured to detect a power level of the at least one laser diode; and a controller configured to modify one or more power level settings associated with the at least one laser diode in response to one or more output signals of the at least one laser power level sensor.Type: ApplicationFiled: November 1, 2012Publication date: May 1, 2014Applicant: LSI CORPORATIONInventors: Ross S. Wilson, Jason P. Brenden, Toan V. Tran
-
Publication number: 20140036945Abstract: A laser driver apparatus, system, and method include a single laser driver. One or more threshold levels and one or more undershoot levels can be digitally combined into a single output with respect to the single laser driver to reduce the output capacitance of the single laser driver and minimize circuit power, resulting in a faster and higher fidelity signal thereof. A decoder (e.g., thermometer decoding) can also be provided, wherein the threshold level(s) and the undershoot level(s) are thermometer decoded via the decoder.Type: ApplicationFiled: August 1, 2012Publication date: February 6, 2014Inventors: Cameron C. Rabe, Jason P. Brenden
-
Publication number: 20130336663Abstract: A driver circuit configured to generate a drive signal for an optical source comprises an overshoot controller that provides an amount of overshoot for a given logic state of the drive signal as a function of a duration of at least one previous logic state of the drive signal. The drive signal may alternate between a first logic state associated with a first operating mode of the optical source and a second logic state associated with a second operating mode of the optical source. The overshoot controller may be configured to provide amounts of overshoot for respective instances of the first logic state that are proportional to the durations of their respective immediately preceding second logic states. The driver circuit may be implemented in a heat-assisted magnetic recording system in which the optical source alternates between on and off states associated with respective magnetic write and magnetic read modes.Type: ApplicationFiled: June 18, 2012Publication date: December 19, 2013Applicant: LSI CorporationInventors: Jason P. Brenden, Xuemin Yang, Cameron C. Rabe
-
Patent number: 8611385Abstract: A driver circuit for a laser diode or other optical source comprises a controllable termination for a transmission line coupled between the driver circuit and the optical source, with the controllable termination being switchable between at least first and second termination configurations. The transmission line comprises a first conductor coupled to a first terminal of the optical source and a second conductor coupled to a second terminal of the optical source, and the driver circuit comprises a first current source configured to drive the first conductor, and a second current source configured to drive the second conductor. By way of example, the first termination configuration may comprise an alternating current (AC) termination configuration and the second termination configuration may comprise a direct current (DC) termination configuration.Type: GrantFiled: May 17, 2012Date of Patent: December 17, 2013Assignee: LSI CorporationInventor: Jason P. Brenden