Charles C Chang

US Patent:

6792211, Sep 14, 2004

Filed:

Mar 15, 2001

Appl. No.:

09/811251

Inventors:

Charles Z. Chang - Milpitas CA
Yuehong Bai - Fremont CA
Suyou He - Fremont CA

Assignee:

Tera FiberOptics - Fremont CA

International Classification:

H04J 1402

US Classification:

398 85, 398 83, 398 82, 398 88, 385 24, 385 33, 385 34

Abstract:

Method and system for selectively adding and dropping selected wavelength components =k and =k (1k k K) in a light signal having a sequence of wavelengths k (k=1, 2,. . . , K), using a dual fiber collimator at each end of an OADM device that contains an optical filter that transmits a selected wavelength k and reflects the other wavelengths k. Connecting two optical communication terminals in a network allows addition and dropping of a selected wavelength. Estimated total optical insertion losses, between the common port and the express port, for 2Ã2 and 3Ã3 add/drop combinations are 0. 4 dB and 0. 8 dB, respectively.

US Patent:

6940514, Sep 6, 2005

Filed:

Apr 26, 2004

Appl. No.:

10/831972

Inventors:

Michael A. Wasserman - Redwood City CA, US
Elena M. Ing - Sunnyvale CA, US
Vannessa M. Nhan - San Jose CA, US
Nandini Ramani - Saratoga CA, US
Charles P. Chang - Sunnyvale CA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06T001/20

US Classification:

345506, 345559

Abstract:

A system and method are disclosed for a rasterization pipeline with a parallel initialization path that may provide an increased rate of triangle processing. The edge walker, span walker, and sample generator modules of a rasterization pipeline may be modified to enable the next primitive in the sequence of primitives to be initialized, while the current primitive is processed. Consequently, these two processes that were done in series may now be done in parallel. Data transmitted between modules may be separated into initialization data (data the module needs to define a primitive) and primitive data (the processed output of each module). The second path is for additional initialization data, which allows each of these modules to receive the initialization data for the next primitive, while processing the primitive data for the current primitive.

US Patent:

7443241, Oct 28, 2008

Filed:

Jul 28, 2006

Appl. No.:

11/494849

Inventors:

Neric Fong - Fremont CA, US
Charles Chang - Fremont CA, US

Assignee:

VIA Technologies Inc. - Taipei

International Classification:

H03F 3/45

US Classification:

330254

Abstract:

A RF variable gain amplifier with an extended linear tuning range is disclosed. The variable gain amplifier employs a wide swing cascode mirror formed by two cascode transistors and two gain transistors. The two cascode transistors track each other, so are the two gain transistor. The gain transistors operate on the saturation region.

US Patent:

7813381, Oct 12, 2010

Filed:

May 7, 2004

Appl. No.:

10/841762

Inventors:

Charles E. Chang - Coto de Caza CA, US
Wim F. Cops - Newport Beach CA, US
Brian Hostetter - Mission Viejo CA, US

Assignee:

Mindspeed Technologies, Inc. - Newport Beach CA

International Classification:

H04J 3/06

US Classification:

370503

Abstract:

Various systems and methods for automatic data rate detection are provided. In one embodiment, a system is provided that includes a clock and data recovery circuit embodied in a first integrated circuit, the clock and data recovery circuit being configured to re-clock a data stream. The system also includes an automatic rate detection system embodied in a second integrated circuit, where the first integrated circuit is in data communication with the second integrated circuit. Also, the automatic rate detection system is configured to determine a data rate of the data stream upon identifying a transition in the data rate of the data stream based upon the state of the at least one status flag received from the clock and data recovery circuit.

US Patent:

8358489, Jan 22, 2013

Filed:

Aug 27, 2010

Appl. No.:

12/807082

Inventors:

Charles Chang - Coto De Caza CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

H02J 7/00

US Classification:

361 18, 307150

Abstract:

According to one embodiment, a smart photovoltaic (PV) panel comprises a plurality of PV cell groups each including at least one PV cell. The smart PV panel also includes at least one serial boost combiner circuit (SBCC) configured to receive an output from the plurality of PV cell groups as inputs. Each SBCC comprises several boost blocks connected in parallel, each of the boost blocks including a switching device and a respective boost block output directly connected to an output node of the SBCC. In addition a corresponding power terminal of each of the switching devices is directly connected to a common ground node of the SBCC. In one embodiment, the smart PV panel also includes a power inverter coupled to the one or more SBCCs and a communication unit interfaced with a local controller.

US Patent:

20070014572, Jan 18, 2007

Filed:

Apr 13, 2005

Appl. No.:

11/106274

Inventors:

Gilberto Sada - Irvine CA, US
Keith Jones - Irvine CA, US
Charles Chang - Coto de Caza CA, US

International Classification:

H04B 10/08

US Classification:

398027000

Abstract:

A method and system for a bit error rate (BER) contour-based optimum decision threshold and sampling phase selection in optical communication systems is disclosed. According to one aspect of the invention, for a selected sampling phase and a decision threshold, high BER values are measured. Low BER values are approximated from the high BER values using error functions. The procedures are repeated for all selected sampling phases and decision thresholds and corresponding BER values are calculated. The sampling phases and decision thresholds for each specific BER value are plotted to create the BER contour diagrams. The optimum decision threshold for a sampling phase is calculated by equating the BER due to marks (“s”) and the BER due to spaces (“s”). In one aspect of the invention, a BER test module resides in the receiver. The BER test module calculates the BERs and the optimum decision threshold and sampling phase.

US Patent:

20090009252, Jan 8, 2009

Filed:

Sep 17, 2008

Appl. No.:

12/212443

Inventors:

Neric Fong - Fremont CA, US
Charles Chang - Fremont CA, US

Assignee:

VIA TECHNOLOGIES INC. - Hsin-Tien

International Classification:

H03G 3/30

US Classification:

330279, 330277

Abstract:

A RF variable gain amplifier with an extended linear tuning range is disclosed. The variable gain amplifier employs a wide swing cascode mirror formed by two cascode transistors and two gain transistors. The two cascode transistors track each others so are the two gain transistor. The gain transistors operate on the saturation region.

US Patent:

20120049801, Mar 1, 2012

Filed:

Aug 27, 2010

Appl. No.:

12/807081

Inventors:

Charles Chang - Coto De Caza CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

H02J 7/00
H02J 7/04

US Classification:

320132, 320136

Abstract:

According to one embodiment, a system configured to provide dynamic power management for a plurality of energy cells comprises an array of energy cells for providing a primary current path to a load, and a respective power stage for each energy cell. The power stages are configured to transfer power to and from each respective energy cell. The system further comprises a temporary energy storage node enabling energy transfer from a first plurality of energy cells comprised by the array of energy cells to a second plurality of energy cells comprised by the array of energy cells. In one embodiment, the system further comprises a feedback system for maintaining the to temporary energy storage node at a constant average power.