David C Soo

6465909, Oct 15, 2002

Jul 31, 2000

09/628534

David Henry Soo - Los Altos CA
Robert Loren Reay - Mountain View CA

Linear Technology Corporation - Milpitas CA

H02J 110

307 52, 307 53, 307 62

Circuits and methods for controlling load sharing by multiple power supplies are provided. In preferred embodiments, load share controllers utilize multiple voltage control loops to monitor the output voltages that are being provided by multiple power supplies connected to a load. These voltage control loops each generate a voltage control voltage that is proportional to the difference between the actual output voltage of the corresponding power supply and the desired output voltage. The voltage control loop with the highest voltage control voltage then controls a current control voltage generated in a current control loop for each power supply via a share bus. These current control loops then regulate the current provided by the corresponding power supplies so that those currents are all proportional to the voltage on the share bus. By monitoring the current control voltage in each current control loop, the voltage at the output of each power supply, and the direction of the current flowing between each power supply and the load, the circuits and methods of preferred embodiments of the invention can detect and account for out-of-regulation conditions, over voltage conditions, short circuit conditions, and hot-swapping conditions.

6608402, Aug 19, 2003

Jun 24, 2002

10/180418

David Henry Soo - Los Altos CA
Robert Loren Reay - Mountain View CA

Linear Technology Corporation - Milpitas CA

H02J 110

307 52, 307 53, 307 62

Circuits and methods for controlling load sharing by multiple power supplies are provided. In preferred embodiments, load share controllers utilize multiple voltage control loops to monitor the output voltages that are being provided by multiple power supplies connected to a load. These voltage control loops each generate a voltage control voltage that is proportional to the difference between the actual output voltage of the corresponding power supply and the desired output voltage. The voltage control loop with the highest voltage control voltage then controls a current control voltage generated in a current control loop for each power supply via a share bus. These current control loops then regulate the current provided by the corresponding power supplies so that those currents are all proportional to the voltage on the share bus. By monitoring the current control voltage in each current control loop, the voltage at the output of each power supply, and the direction of the current flowing between each power supply and the load, the circuits and methods of preferred embodiments of the invention can detect and account for out-of-regulation conditions, over voltage conditions, short circuit conditions, and hot-swapping conditions.

6903749, Jun 7, 2005

Nov 5, 2002

10/288745

David Soo - Fremont CA, US
Meng Long - Milpitas CA, US

Chrontel, Inc. - San Jose CA

G09G005/02

345605, 345606, 345609, 345619, 345698, 382299, 382300

A sub-system and method to receive input image pixel amplitude data at an input pixel resolution and to output image pixel amplitude data in one or two dimensions at a higher pixel resolution includes a computer system-executable algorithm with user-programmable coefficients. The programmable coefficients are user-selectable according to the nature and quality of the input image data such that sharpness of the output image data can be at least partially tailored to the image.

8279202, Oct 2, 2012

Apr 10, 2009

12/422064

David Soo - Fremont CA, US

Chrontel International Ltd. - Hamilton

G06F 3/041

345178, 178 1803

The present invention relates to methods of making and using and apparatus for providing touch screen capability using an LCD screen without an extra touch screen layer.

8619400, Dec 31, 2013

Mar 19, 2012

13/424116

Robert Curtis Dobkin - Monte Sereno CA, US
David Henry Soo - Los Altos CA, US

Linear Technology Corporation - Milpitas CA

H02H 9/04

361 911

An overvoltage protection method and circuit includes a positive supply input node, an output node, and a negative supply node. The overvoltage protection circuit further includes a first functional circuit configured to turn ON a MOSFET and maintain it in a low resistance state. A second functional circuit is configured to detect an overvoltage and control the gate of the MOSFET to regulate a voltage at the output node. A third functional circuit is configured to provide a startup wherein the overvoltage protection circuit is not damaged and/or to regulate an operating voltage such that an overvoltage does not appear on the overvoltage protection circuit. The external components include the MOSFET, which has a gate coupled to the output of the charge pump of the overvoltage protection circuit.

20060274977, Dec 7, 2006

Jun 7, 2005

11/147667

David Soo - Fremont CA, US
Meng Long - Milpitas CA, US

G06K 9/32

382300000

A sub-system and method to receive input image pixel amplitude data at an input pixel resolution and to output image pixel amplitude data in one or two dimensions at a higher pixel resolution includes a computer system-executable algorithm with user-programmable coefficients. The programmable coefficients are user-selectable according to the nature and quality of the input image data such that sharpness of the output image data can be at least partially tailored to the image.

20100164289, Jul 1, 2010

Dec 22, 2009

12/645341

Christopher Bruce UMMINGER - Mountain View CA, US
David Henry Soo - Los Altos CA, US
Mitchell Edward Lee - San Jose CA, US
Pinkesh Sachdev - Santa Clara CA, US
Zhipeng Li - Cambridge MA, US

H02J 1/10

307 55

An apparatus and method for load sharing among N current supplies, where N>1. N current supply paths are coupled to corresponding N independent power sources, respectively. A system load is coupled to the outputs of the N current supply paths to receive N current supplies. There is a common current share bus configured to connect to the N current supply paths to provide a common current share signal, used to indicate the current contribution needed from each of the N current supply paths. In this configuration, each of the N current supply paths adjusts an adjustable voltage drop between its power source and the current supply it provides to the system load in accordance with the common current share signal so that the current supplied from each current supply path is consistent with the common current share signal.

54733421, Dec 5, 1995

Oct 19, 1993

8/138954

Lawrence T. Tse - Fremont CA
Tat C. Choi - Milpitas CA
David C. Soo - Fremont CA

Chrontel, Inc. - San Jose CA

G09G 102

345132

A RAMDAC circuit drives a display device so as display multiple modes of color depth and display resolution in a single display frame without sacrificing resolution of the higher-resolution mode, and adjusts the output pixel rate to match that of the display mode being display on a pixel-by-pixel basis. The RAMDAC circuit switches between two graphics modes on-the-fly on a pixel-by-pixel basis in accordance with mode control bits stored in the pixel data. Furthermore, the RAMDAC circuit switches between two output pixel rates such that the amount of video memory used for any predefined screen area remains constant even though the output pixel rate and resolution are dynamically adjusted. In a preferred embodiment a display mode signal is embedded in the display data such that the display data, including the mode signal, comprises one byte of data for each display pixel when the mode signal specifies the first display mode, and comprises two bytes of data for each display pixel when the mode signal specifies the second display mode.