Min Chen

US Patent:

7240050, Jul 3, 2007

Filed:

Jan 14, 2004

Appl. No.:

10/758546

Inventors:

Michelle Xue Zhou - Briarcliff Manor NY, US
Min Chen - Belmont CA, US

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 17/30

US Classification:

707 3, 707 6

Abstract:

A technique is provided for generating automated graphics in response to a user request. A measure of similarity between the user request and one or more stored graphics examples is determined. At least one stored graphics example is obtained based on the similarity measure. Graphics are created from the at least one obtained graphics example and the user request.

US Patent:

7589593, Sep 15, 2009

Filed:

Jan 30, 2008

Appl. No.:

12/022159

Inventors:

Jie-Wei Lai - Taipei, TW
Min Chen - Fremont CA, US

Assignee:

Mediatek Inc. - Hsin-Chu

International Classification:

H03F 3/04
H03F 1/22

US Classification:

330295, 330311

Abstract:

An amplifier circuit for amplifying an input signal to generate an output signal is provided. The amplifier circuit has a stacked main amplifier, a parallel sub-amplifier, and a signal combiner. The stacked main amplifier includes a first amplifier unit for outputting a first amplified signal generated from processing the input signal; and a second amplifier unit for outputting a second amplified signal generated from processing the first amplified signal. The first amplifier unit and the second amplifier unit share bias current. The parallel sub-amplifier is coupled to the stacked main amplifier according to a parallel connection fashion, and outputs a third amplified signal generated from processing the input signal. The signal combiner combines the second amplified signal and the third amplified signal to generate the output signal.

US Patent:

7595954, Sep 29, 2009

Filed:

Apr 18, 2006

Appl. No.:

11/406089

Inventors:

Min Chen - San Jose CA, US
Li Yi - Berkeley CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 5/596

US Classification:

360 7708, 360 7704

Abstract:

Disclosed is a method of estimating repeatable runout (RRO) for a disk drive. The method includes: determining a plurality of position error signal (PES) values for a plurality of servo wedges of a track of a disk; and estimating repeatable runout (RRO) in the PES values for the servo wedges of the track by averaging determined PES values over a pre-determined number of revolutions of the disk of the disk drive and scaling the averaged PES values by a pre-determined ratio of the variance of non-repeatable runout (NRRO) to the variance of an optimal estimation of the RRO for the disk drive.

US Patent:

7675707, Mar 9, 2010

Filed:

Nov 21, 2008

Appl. No.:

12/275989

Inventors:

Min Chen - San Leandro CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 21/02

US Classification:

360 75

Abstract:

A disk drive is disclosed comprising a disk, a head actuated over the disk, and control circuitry operable to generate a fly height control signal. A fly height of the head is measured, and the measured fly height is combined with a target fly height and a feedforward signal, wherein the feedforward signal is generated according to:acos(2πnk/N)+bsin(2πnk/N)where aand bare coefficients and 2πnk/N represents a frequency of a repeatable disturbance in the fly height of the head.

US Patent:

7688538, Mar 30, 2010

Filed:

Nov 16, 2007

Appl. No.:

11/941467

Inventors:

Min Chen - San Leandro CA, US
Duc T. Phan - Saratoga CA, US

Assignee:

Western Digital Technologies, Inc. - Lake Forest CA

International Classification:

G11B 21/02

US Classification:

360 75

Abstract:

A disk drive is disclosed comprising a disk surface having a plurality of servo sectors for defining a plurality of servo tracks, and a head actuated radially over the disk surface. A first servo sector defines a first servo track comprising a first track address having a first width, and a second servo sector defines a second servo track comprising a second track address having a second width substantially less than the first width. In one embodiment the servo sectors are written using an external servo writer or media writer, and in another embodiment the servo sectors are self-servo written by the disk drive.

US Patent:

7961422, Jun 14, 2011

Filed:

Feb 19, 2009

Appl. No.:

12/388644

Inventors:

Min Chen - San Leandro CA, US
Li Yi - Mountain View CA, US
Duc T. Phan - Saratoga CA, US

Assignee:

Western Digital Technologies, Inc. - Irvine CA

International Classification:

G11B 5/596

US Classification:

360 7704, 360 7708

Abstract:

A disk drive is disclosed comprising a disk having a plurality of servo tracks that define a plurality of data tracks, and a head actuated over the disk by a voice coil motor (VCM), wherein the head comprises a read element offset radially from a write element. The read element is positioned over a first servo track and the write element is positioned over a second servo track, and a first repeatable runout (RRO) of the first servo track is measured. The read element is positioned over the second servo track, and a second RRO of the second servo track is measured. A data center off-track is computed in response to the first RRO and the second RRO.

US Patent:

8001733, Aug 23, 2011

Filed:

Dec 4, 2009

Appl. No.:

12/592844

Inventors:

Min Chen - Fremont CA, US

International Classification:

B66F 3/08
E21D 15/00

US Classification:

521264, 254 98, 254 92, 254 93 A, 254100, 521266, 52632, 2483543, 405290

Abstract:

A post adjustable in length as required. The post can be adjusted at any time during and after construction. The post can be used as an extension of a column which requires adjustment in length. The post can be used as a jack. The post is capable of withstanding compression, tension, and dynamic loading. The post can be used to provide support to beams and girders in a house frame.

US Patent:

8058810, Nov 15, 2011

Filed:

May 7, 2009

Appl. No.:

12/437273

Inventors:

Min Chen - Milpitas CA, US
Bryan Avery Legates - Los Altos Hills CA, US

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

H05B 39/04

US Classification:

315209R, 315307, 315297, 315224

Abstract:

System and method for a light emitting diode (LED) driver are disclosed. To supply an LED bus voltage to a large array of LEDs organized in multiple channels where one or more LEDs are connected in series in each channel, an LED driver includes a power converter, a feedback generation circuit, and a phase-division based controller. The power converter is configured for providing the LED bus voltage to the multiple LED channels based on a voltage control signal. The feedback generation circuit is configured for generating a feedback signal based on the LED bus voltage supplied to the multiple LED channels. The phase-division based controller is configured for generating the voltage control signal based on the feedback signal and information from the multiple LED channels. The phase-division based controller divides each pulse width modulation (PWM) of each channel into a tracking phase and a pre-charging phase so that the LED bus voltage supplied to the multiple channels changes between the tracking phase and the pre-charging phase.