Xi I Chen

US Patent:

6546047, Apr 8, 2003

Filed:

Oct 8, 1999

Appl. No.:

09/415567

Inventors:

Xi Chen - Fremont CA
Bao Lenguyen - San Jose CA
Wen-Chung (Stewart) Wu - Cupertino CA

Assignee:

Altima Communications, Inc. - San Jose CA

International Classification:

H03H 740

US Classification:

375229, 375232, 375233, 333 18

Abstract:

Methods and circuits utilizing a two stage adaptation algorithm to determine the optimal code for an equalizer to compensate a received signal is disclosed. In the first stage, a coarse tuning algorithm is used to choose a range of codes based on the amplitude of the received signal. The chosen codes will be used as reference points in the second stage. In the second stage, a fine tuning algorithm is used to select a code in the range of reference codes determined in stage one. The fine tuning algorithm looks to the status of the data lock signal generated by the clock recovery circuit. If the data lock signal does not indicate a lock, the fine tuning algorithm cycles through the range of reference codes. If the data lock signal indicates a lock, then that particular code is continued to be used for the equalizer.

US Patent:

7079571, Jul 18, 2006

Filed:

Oct 8, 1999

Appl. No.:

09/415679

Inventors:

Xi Chen - Fremont CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 1/38

US Classification:

375219, 375222, 375312, 370247, 370282, 713310, 713323

Abstract:

A transceiver circuit having 10 mb and 100 mb transmit and receive circuitries using the power saving methods allows for power consumption of the transceiver circuit to be significantly reduced. This is accomplished by providing each defined subcircuit with its own power supply and means of activation and deactivation. However, the method for activating and deactivating digital subcircuits and analog subcircuits are different and therefore different types of control signals and methods are provided. Furthermore, there are two general types of power-saving situations. The first type is near total circuit power-down and the second type is partial circuit power-down. In yet another embodiment, a method for minimizing energy usage during the idle period is utilized.

US Patent:

7183300, Feb 27, 2007

Filed:

Nov 10, 2005

Appl. No.:

11/271437

Inventors:

Michael F. Summers - Ellicott City MD, US
Atul Agarwal - Hamden CT, US
Xi Chen - Killingworth CT, US
Milind Deshpande - Madison CT, US

International Classification:

A61K 31/4245
A61K 31/426
A61K 31/341
C07D 271/08
C07D 277/48
C07D 307/54

US Classification:

514364, 514377, 514461, 548125, 548196, 549473

Abstract:

Substituted aryl aminomethyl thiazole ureas and analogues thereof that act as inhibitors of viral capsid formation, including HIV capsid formation, are provided here. Generally the virus capsid formation inhibitors described herein are compounds of Formula I.

US Patent:

7376179, May 20, 2008

Filed:

Mar 10, 2003

Appl. No.:

10/383571

Inventors:

Xi Chen - Fremont CA, US
Bao Lenguyen - San Jose CA, US
Wen-Chung (Stewart) Wu - Cupertino CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H03H 7/30

US Classification:

375229

Abstract:

Methods and circuits utilizing a two stage adaptation algorithm to determine the optimal code for an equalizer to compensate a received signal is disclosed. In the first stage, a coarse tuning algorithm is used to choose a range of codes based on the amplitude of the received signal. The chosen codes will be used as reference points in the second stage. In the second stage, a fine tuning algorithm is used to select a code in the range of reference codes determined in stage one. The fine tuning algorithm looks to the status of the data lock signal generated by the clock recovery circuit. If the data lock signal does not indicate a lock, the fine tuning algorithm cycles through the range of reference codes. If the data lock signal indicates a lock, then that particular code is continued to be used for the equalizer.

US Patent:

7825252, Nov 2, 2010

Filed:

Sep 11, 2007

Appl. No.:

11/853606

Inventors:

Eric Dowdy - Foster City CA, US
Xi Chen - Santa Clara CA, US
Steven Pfeiffer - Pleasanton CA, US

Assignee:

Gilead Sciences, Inc. - Foster City CA

International Classification:

C07D 215/38

US Classification:

546159, 546163

Abstract:

The invention provides synthetic processes and synthetic intermediates that can be used to prepare 4-oxoquinolone compounds having useful integrase inhibiting properties.

US Patent:

7852843, Dec 14, 2010

Filed:

Jul 10, 2007

Appl. No.:

11/775833

Inventors:

Yung-Chung Liu - Taipei, TW
Xi Chen - Fremont CA, US
Yu Chih Tsao - Taipei, TW
Chien Hsiung Chang - Jhubei, TW
Chien-Chih Chen - Toufen, TW
Xiaochong Cao - Fremont CA, US
Chih-Hsien Hsu - Hsinchu, TW

Assignee:

Cortina Systems, Inc. - Sunnyvale CA

International Classification:

H04L 12/28

US Classification:

370392, 370389

Abstract:

High-speed networking application equipments with a layer-2 to layer-7 hardware search engine and method are with flexibility and performance improvement. The multi-layer switches/routers, network address translation (NAT) gateway, firewall/VPN router and network attached storage (NAS) may use the search engine for fast and efficient search requirement.

US Patent:

8116357, Feb 14, 2012

Filed:

May 25, 2006

Appl. No.:

11/440151

Inventors:

Xi Chen - Fremont CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04B 1/38

US Classification:

375219, 375312, 375220, 375222, 375295, 455 132, 4553433, 4553434

Abstract:

A transceiver circuit having 10 mb and 100 mb transmit and receive circuitries using the power saving methods of the present invention is disclosed. The power consumption of the transceiver circuit can be significantly reduced by providing each defined subcircuit with its own power supply and means of activation and deactivation. However, the method for activating and deactivating digital subcircuits and analog subcircuits are different and therefore different types of control signals and methods are provided. Furthermore, there are two general types of power-saving situations. The first type is near total circuit power-down and the second type is partial circuit power-down. The present invention in yet another embodiment discloses a method for minimizing energy usage during idle period.

US Patent:

8324244, Dec 4, 2012

Filed:

Sep 28, 2010

Appl. No.:

12/892682

Inventors:

Eric Dowdy - Foster City CA, US
Xi Chen - Santa Clara CA, US
Steven Pfeiffer - Temecula CA, US

Assignee:

Gilead Sciences, Inc. - Foster City CA

International Classification:

A61K 31/47
A61K 31/4174
A61K 31/216
C07D 215/20
C07D 233/20
C07C 69/773

US Classification:

514312, 546159, 546163, 5483341, 560 57, 514390, 514532

Abstract:

The invention provides synthetic processes and synthetic intermediates that can be used to prepare 4-oxoquinolone compounds having useful integrase inhibiting properties.