David D Leung

US Patent:

6980020, Dec 27, 2005

Filed:

Dec 19, 2003

Appl. No.:

10/741172

Inventors:

Scott C. Best - Palo Alto CA, US
Anthony Koon Wong - Daly City CA, US
David Leung - Cupertino CA, US

Assignee:

Rambus Inc. - Los Altos CA

International Classification:

H03K019/003
H03K017/16

US Classification:

326 30, 326 86, 327108

Abstract:

Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a transmitter die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains the termination resistances for the signal transmission lines. The ODT control system derives a number of calibration currents from precision voltage and resistance references and distributes the reference currents to a number of transmitters. Each transmitter then derives an ODT calibration signal using the respective reference current and another precision resistor, and then employs the calibration signal to calibrate local termination elements. Distributing calibrated currents provides excellent noise immunity, while limiting the requisite number of external voltage references reduces cost.

US Patent:

7408378, Aug 5, 2008

Filed:

Nov 23, 2005

Appl. No.:

11/286229

Inventors:

Scott C. Best - Palo Alto CA, US
Anthony Koon Wong - Daly City CA, US
David Leung - Cupertino CA, US

Assignee:

Rambus Inc. - Los Altos CA

International Classification:

H03K 17/16

US Classification:

326 30, 326 87

Abstract:

Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a transmitter die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains the termination resistances for the signal transmission lines. The ODT control system derives a number of calibration currents from precision voltage and resistance references and distributes the reference currents to a number of transmitters. Each transmitter then derives an ODT calibration signal using the respective reference current and another precision resistor, and then employs the calibration signal to calibrate local termination elements. Distributing calibrated currents provides excellent noise immunity, while limiting the requisite number of external voltage references reduces cost.

US Patent:

20100052613, Mar 4, 2010

Filed:

Aug 29, 2008

Appl. No.:

12/201446

Inventors:

David Leung - San Mateo CA, US
Yasuhiro Yamamoto - Los Angeles CA, US

Assignee:

Monster Cable Products, Inc. - Brisbane CA

International Classification:

H02J 7/00

US Classification:

320114

Abstract:

A battery charger having an integral cable management means is adapted to receive power from a vehicle electrical system and provide power to a portable personal electronic device, for recharging the portable personal electronic device battery while allowing the audio and/or video output of the device to simultaneously be provided for listening or viewing by the user.

US Patent:

20100056073, Mar 4, 2010

Filed:

Aug 29, 2008

Appl. No.:

12/201645

Inventors:

David Leung - San Mateo CA, US
Yasuhiro Yamamoto - Los Angeles CA, US

Assignee:

Monster Cable Products, Inc. - Brisbane CA

International Classification:

H04B 1/40

US Classification:

455 77

Abstract:

A connecting cable with a built-in FM tuner and transmitter for connecting a portable entertainment device with an external entertainment system for wireless playback from the device to the system over preset frequencies, and which the user can operate without needing to look at the apparatus in order to select a different FM frequency for playback operation if the need arises.

US Patent:

61113972, Aug 29, 2000

Filed:

Jul 22, 1998

Appl. No.:

9/120622

Inventors:

David Leung - Cupertino CA

Assignee:

LSI Logic Corporation - Milpitas CA

International Classification:

G05F 316

US Classification:

323315

Abstract:

A reference voltage generator for producing a regulated, temperature-compensated output voltage from an unregulated power supply voltage is provided herein. The reference voltage generator includes a pre-regulating circuit and a temperature-compensating circuit. The temperature compensating circuit includes a first series path comprising a first cascode current sources and a first resistor; a second series path comprising a second cascode current source, a first field effect transistor and a first diode; and a third series path comprising a third cascode current source, a second field effect transistor, a second resistor and a second diode. The first series path being connected to the second series path between the first field resistor and the first diode. The current produced by the first current source, develops a voltage across the first resistor, which varies at least as a function of the ratio of the first and second resistors, the ratio of the diode junction areas, the dimensions of the first and second field effect transistors, and the first diode thermal voltage which has a positive temperature coefficient. The voltage across the first diode has a negative temperature coefficient.

US Patent:

56887639, Nov 18, 1997

Filed:

May 25, 1994

Appl. No.:

8/248832

Inventors:

R. Glenn Hammonds - Oakland CA
David W. Leung - Mercer Island WA
Steven A. Spencer - San Mateo CA
William I. Wood - San Mateo CA
Peter Cameron Colosi - Belmont CA

International Classification:

A61K 3827
A61K 3818
A61K 3817
C07K 1472

US Classification:

514 12

Abstract:

Growth hormone receptor and growth hormone binding protein are purified enabling amino acid sequence and DNA isolates coding for growth hormone receptor and growth hormone binding protein and methods of obtaining such DNA are provided, together with expression systems for recombinant production of growth hormone receptor and growth hormone binding protein. Therapeutically useful forms of the growth hormone receptor and growth hormone binding protein and anti-receptor antibodies are described.