Andrew K Davidson

Address:

3321 Octavia St, San Francisco, CA 94123

Phone:

5304489948

VIN:

WVGEK9BPXCD010929

Make:

VOLKSWAGEN

Model:

TOUAREG

Year:

2012

Address:

3321 Octavia St, San Francisco, CA 94123

Phone:

5304489948

VIN:

WAUFFAFL3AN054717

Make:

AUDI

Model:

A4

Year:

2010

Address:

337 Newton St UNIT 2, Waltham, MA 02453

Phone:

6177773206

VIN:

WDDGF81X99R070764

Make:

MERCEDES-BENZ

Model:

C-CLASS

Year:

2009

US Patent:

6559946, May 6, 2003

Filed:

Oct 15, 2001

Appl. No.:

09/978747

Inventors:

Andrew Davidson - Mountain View CA
Jan-Willem Pieterse - San Jose CA

Assignee:

New Focus, Inc. - San Jose CA

International Classification:

G01B 902

US Classification:

356450, 356477

Abstract:

A method and apparatus for minimizing the effects of noise when measuring a response of a device under test to laser light. Laser light provided from a laser source is provided to an interferometer, which splits the source laser light into a first laser light portion and a second laser light portion and then interferometrically combines the first laser light and the second laser light, resulting in a time-varying interference modulated test laser light and a time-varying interference modulated reference laser light. The time-varying interference modulated test laser light is propagated to a device under test so as to cause the device under test to propagate responsive time-varying interference modulated test laser light. The responsive time-varying interference modulated test laser light is converted to an responsive amplitude modulated electrical test signal, which is high pass filtered. The high pass filtered signal is then demodulated so as to produce a time-varying electrical signal that represents the responsive time-varying interference modulated test laser light propagated by the device under test in response to the time varying interference modulated test laser light.

US Patent:

6608847, Aug 19, 2003

Filed:

Sep 28, 2001

Appl. No.:

09/967885

Inventors:

Guangzhi Z. Zhang - San Jose CA
Andrew Davidson - Mountain View CA
David Robinson - Cupertino CA
Carter Hand - Los Altos CA
Mark Wippich - Campbell CA
Murray Reed - Menlo Park CA
Weizhi Wang - San Jose CA

Assignee:

New Focus, Inc. - San Jose CA

International Classification:

H01S 310

US Classification:

372 20, 372 98, 372 92, 372 99, 372 9

Abstract:

A laser apparatus and method with compact cavity design that provides suppression of source spontaneous emission (SSE) and amplified spontaneous emission (ASE) light with minimal loss. The laser comprises a gain medium emitting a light beam along an optical path, a tuning element positioned in the optical path and configured feed back light of a selected wavelength to the gain medium and configured to define a first output beam directed along a first output path, a partial reflector located in the optical path and positioned to create a second output beam directed along a second output path substantially parallel to the first output path; and having a spontaneous emission component that is spatially separated from the selected wavelength. The second output beam can be coupled into optical fiber and produce a coherent light source with high spectral purity and tunable wavelengths.

US Patent:

6754197, Jun 22, 2004

Filed:

Sep 15, 2000

Appl. No.:

09/663102

Inventors:

Andrew M. Davidson - San Jose CA
Jeffrey Scott Kuskin - Mountain View CA
Deepak Prabhakar Dhamdhere - San Jose CA
Fiona J. Cain - San Jose CA

Assignee:

Atheros, Inc. - Sunnyvale CA

International Classification:

H04Q 724

US Classification:

370338, 370394

Abstract:

Systems and methods to provide ordered transmission of data packets to multiple destinations are presented. A transmission device includes a transmitter, a data packet ordering unit, a state table, and a transmit management interface such as a hardware/software unit. The state table stores a transmit block status of each destination. The transmit management interface is coupled to the transmitter and analyzes data packets. The transmit management interface determines whether to transmit a data packet targeted to a particular destination or to block transmission of data packets to the particular destination by examining the transmit block status of the particular destination from the state table.

US Patent:

6940865, Sep 6, 2005

Filed:

Aug 9, 2001

Appl. No.:

09/925978

Inventors:

Jeffrey Scott Kuskin - Mountain View CA, US
Andrew M. Davidson - San Jose CA, US

Assignee:

Atheros Communications, Inc. - Sunnyvale CA

International Classification:

H04L012/28

US Classification:

370412, 709232

Abstract:

A method of queue management includes: adding entries having a first priority to a first software queue; adding entries having a second priority to a second software queue; reading entries from the first software queue to a physical queue; at a threshold time, flushing entries from the physical queue; after the act of flushing the physical queue, reading entries from the second software queue to the physical queue until a termination criterion is satisfied; after the termination criterion is satisfied, reading entries from the first software queue to the physical queue; and transmitting entries from the physical queue to a network.

US Patent:

6999443, Feb 14, 2006

Filed:

Sep 15, 2000

Appl. No.:

09/663045

Inventors:

Jeffrey Scott Kuskin - Mountain View CA, US
Andrew M. Davidson - San Jose CA, US

Assignee:

Atheros Communications, Inc. - Sunnyvale CA

International Classification:

H04Q 7/24

US Classification:

370338, 370463

Abstract:

A Hardware MAC (Media Access Control) unit implements time-critical functions according the 802. 11 standard for telecommunications, thereby enhancing system performance. The MAC layer includes three sub-layers: MLME (MAC Sublayer Management Entity), which connects the MAC unit with the host CPU, FTM (Frame Transition Manager), which connects the MAC unit with the network, and FLPM (Frame Level Protocol Manager), which internally connects the MLME sub-layer with the FTM sub-layer. In particular, the FLPM manager includes time-critical and non-time-critical functions that are customarily implemented in software on the MAC by a MAC CPU (Central Processing Unit). The hardware MAC implements time-critical FLPM functions in hardware on the MAC and implements non-time-critical FLPM functions in software on the host CPU so that requirements for processing software on the MAC preferably may be altogether eliminated or alternatively may be substantially reduced.

US Patent:

7092644, Aug 15, 2006

Filed:

Sep 28, 2001

Appl. No.:

09/967415

Inventors:

Andrew Davidson - Mountain View CA, US

Assignee:

New Focus, Inc. - San Jose CA

International Classification:

H04B 10/06

US Classification:

398202, 398210, 398213

Abstract:

An optical receiver may include a photodetector that is configured to generate an electrical signal in response to detecting an optical signal, a first gain path coupled to receive and amplify the electrical signal generated by the photodetector, and a second gain path coupled to receive and amplify the electrical signal generated by the photodetector. The second gain path may have a higher gain than the first gain path. The two gain paths may be configured to amplify the electrical signal independently of each other. The optical receiver may also include a switch that selectably outputs an amplified electrical signal from one of the gain paths based on a magnitude of a signal corresponding to the optical signal.

US Patent:

7185196, Feb 27, 2007

Filed:

Sep 15, 2000

Appl. No.:

09/662991

Inventors:

Jeffrey Scott Kuskin - Mountain View CA, US
Deepak Prabhakar Dhamdhere - San Jose CA, US
Fiona J. Cain - San Jose CA, US
Andrew M. Davidson - San Jose CA, US

Assignee:

Atheros Communications, Inc. - Sunnyvale CA

International Classification:

H04L 9/00
H04L 29/06
H04L 29/00

US Classification:

713162, 380 28, 380270, 709225, 709227

Abstract:

A key-caching system retrieves actively used keys from a relatively fast cache memory for fast processing of wireless communications. Additional keys are stored in relatively slow system memory that has high storage capacity. As keys become needed for active use, the keys are retrieved from the system memory and stored in the cache memory. By using active memory for keys actively being used, system performance is enhanced. By using system memory for keys not being used, a greater number of keys are available for transfer to the cache and subsequent active use.

US Patent:

7330657, Feb 12, 2008

Filed:

Apr 1, 2004

Appl. No.:

10/816255

Inventors:

Andrew C. Davidson - Mountain View CA, US

Assignee:

Bookham Technology PLC - Abington

International Classification:

H04J 14/02

US Classification:

398 79, 398202, 398 77, 398 82, 398 75, 398 76, 398 91, 398204, 398212, 398214, 398182, 398183, 398203, 398140, 398141, 385 24, 385 37, 359 9, 359 15, 359556, 359559, 359569, 359237

Abstract:

An apparatus and method for demultiplexing multiple wavelengths of light. In one embodiment, an optical signal having a plurality of wavelengths is provided to an optical-to-electrical (OE) circuit configured to convert optical signals into electrical signals. The optical signal may include a plurality of wavelengths. The OE circuit converts the optical signal into a first electrical signal. The first electrical signal is received by a demodulating circuit, which also receives a demodulating signal. The demodulating circuit combines both the first electrical signal and the demodulating signal in order to produce a second electrical signal. Both the second electrical signal and the demodulating signal correspond to one of the wavelengths in the optical signal.