Xin J Wang

US Patent:

6696854, Feb 24, 2004

Filed:

Sep 17, 2001

Appl. No.:

09/956374

Inventors:

Afshin Momtaz - Irvine CA
Xin Wang - Irvine CA
Jun Cao - Irvine CA
Armond Hairapetian - Glendale CA
David Chung - Newport Beach CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G11C 700

US Classification:

326 37, 326 40, 365221

Abstract:

Methods and circuitry for implementing high speed first-in first-out (FIFO) structures. In one embodiment, a FIFO is disclosed that allows the frequency of one clock, e. g. , the write clock, to be different than (e. g. , half) that of the other (read) clock. In another embodiment a FIFO is presented that can be set and/or reset asynchronously. Other embodiments are disclosed wherein the read and write pointers are effectively monitored to ensure proper timing relationship, to detect loss of clock as well as to detect other abnormal FIFO conditions.

US Patent:

6760353, Jul 6, 2004

Filed:

Jul 30, 2002

Appl. No.:

10/209293

Inventors:

Xin Wang - Irvine CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H01S 300

US Classification:

372 3802, 372 3807

Abstract:

Driver circuits of the present invention provide current to drive laser diodes. The output current of the driver circuit includes a data signal and a low frequency tone signal. The low frequency tone signal is within the bandwidth of a power control feedback loop. The tone signal introduces low frequency noise into the output signal of the driver circuit. The low frequency noise causes jitter at the zero crossing points of the driver circuit output signal. A laser driver circuit of the present invention provides a compensation current to a laser diode. The compensation current is out of phase with the tone signal. The compensation current eliminates the low frequency noise in the output signal of the laser driver circuit.

US Patent:

6931545, Aug 16, 2005

Filed:

Aug 28, 2000

Appl. No.:

09/649838

Inventors:

Thanh Ta - Huntington Beach CA, US
Xin Wang - Los Angeles CA, US

Assignee:

ContentGuard Holdings, Inc. - Wilmington DE

International Classification:

G06F011/30
G06F012/14
H04L009/32
H04L009/00

US Classification:

713200, 713156, 713187

Abstract:

A content provider, such as a document publisher or distributor, provides, for example, protected content to a user, for consumption within a trusted user environment. By providing integrity certification and verification services, the authenticity of the content consumption environments can be verified. The content provider forwards to the user a protected version of the digital content which includes, for example, a license agreement and an integrity profile identification. The profile includes, for example, the applications and system components that are allowed to be used in conjunction with the protected content. Additionally, the content provider initiates a request for an integrity profile. This request for the integrity profile is forwarded to an integrity certification and verification device. The integrity certification and verification device can, for example, if an integrity profile does not already exist for the requested applications and/or systems components, query a content consumption system/application provider, who, for example, has supplied the system components to the user.

US Patent:

6940306, Sep 6, 2005

Filed:

Dec 31, 2003

Appl. No.:

10/750098

Inventors:

Afshin Momtaz - Laguna Hills CA, US
Xin Wang - Irvine CA, US
Jun Cao - Irvine CA, US
Armond Hairapetian - Glendale CA, US
David Chung - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G11C007/00

US Classification:

326 37, 326 40, 365221

Abstract:

Methods and circuitry for implementing high speed first-in first-out (FIFO) structures. In one embodiment, a FIFO is disclosed that allows the frequency of one clock, e. g. , the write clock, to be different than (e. g. , half) that of the other (read) clock. In another embodiment a FIFO is presented that can be set and/or reset asynchronously. Other embodiments are disclosed wherein the read and write pointers are effectively monitored to ensure proper timing relationship, to detect loss of clock as well as to detect other abnormal FIFO conditions.

US Patent:

6963220, Nov 8, 2005

Filed:

Dec 31, 2003

Appl. No.:

10/749965

Inventors:

Afshin Momtaz - Laguna Hills CA, US
Xin Wang - Irvine CA, US
Jun Cao - Irvine CA, US
Armond Hairapetian - Glendale CA, US
David Chung - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G11C007/00

US Classification:

326 37, 326 40, 365221

Abstract:

Methods and circuitry for implementing high speed first-in first-out (FIFO) structures. In one embodiment, a FIFO is disclosed that allows the frequency of one clock, e. g. , the write clock, to be different than (e. g. , half) that of the other (read) clock. In another embodiment a FIFO is presented that can be set and/or reset asynchronously. Other embodiments are disclosed wherein the read and write pointers are effectively monitored to ensure proper timing relationship, to detect loss of clock as well as to detect other abnormal FIFO conditions.

US Patent:

6963221, Nov 8, 2005

Filed:

Dec 30, 2004

Appl. No.:

11/027193

Inventors:

Afshin Momtaz - Irvine CA, US
Xin Wang - Irvine CA, US
Jun Cao - Irvine CA, US
Armond Hairapetian - Glendale CA, US
David Chung - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G11C007/00

US Classification:

326 37, 326 40, 365221

Abstract:

Methods and circuitry for implementing high speed first-in first-out (FIFO) structures. In one embodiment, a FIFO is disclosed that allows the frequency of one clock, e. g. , the write clock, to be different than (e. g. , half) that of the other (read) clock. In another embodiment a FIFO is presented that can be set and/or reset asynchronously. Other embodiments are disclosed wherein the read and write pointers are effectively monitored to ensure proper timing relationship, to detect loss of clock as well as to detect other abnormal FIFO conditions.

US Patent:

7035303, Apr 25, 2006

Filed:

Jun 23, 2004

Appl. No.:

10/874519

Inventors:

Xin Wang - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H01S 3/00

US Classification:

372 3802, 372 3807

Abstract:

Driver circuits of the present invention provide current to drive laser diodes. The output current of the driver circuit includes a data signal and a low frequency tone signal. The low frequency tone signal is within the bandwidth of a power control feedback loop. The tone signal introduces low frequency noise into the output signal of the driver circuit. The low frequency noise causes jitter at the zero crossing points of the driver circuit output signal. A laser driver circuit of the present invention provides a compensation current to a laser diode. The compensation current is out of phase with the tone signal. The compensation current eliminates the low frequency noise in the output signal of the laser driver circuit.

US Patent:

7068787, Jun 27, 2006

Filed:

Mar 24, 2000

Appl. No.:

09/534756

Inventors:

Thanh T. Ta - Huntington Beach CA, US
Prasad Ram - Manhattan Beach CA, US
Robert E. Schuler - Hermosa Beach CA, US
Arun Ramanujapuram - Redondo Beach CA, US
Guillermo Lao - Torrance CA, US
Xin Wang - Los Angeles CA, US

Assignee:

Contentguard Holdings, Inc. - Wilmington DE

International Classification:

G06F 7/167

US Classification:

380240, 380200, 380201, 713193, 705 57

Abstract:

A digital work and a system context (or resource information or system resource) are polarized enabling trusted rendering or replay of the digital work without depolarization of the digital content. The digital work includes digital content and resource information. Resource information may include information used by a replay application to format or process the digital content. The digital work and system context are polarized using a polarization scheme which relies on a polarization seed to initialize and customize the polarization. Different types of polarization seeds may be used, including a random number, a user's system's state or characteristic and a dynamic state-based polarization seed based on a dynamic system state or characteristic.