Charles S 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:

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.