Eugene C Cheung

US Patent:

7714550, May 11, 2010

Filed:

Oct 20, 2005

Appl. No.:

11/253697

Inventors:

Talbott M. Houk - Monte Sereno CA, US
Joseph Duncan - Palo Alto CA, US
Eugene L. Cheung - Fremont CA, US

Assignee:

Linear Technology Corporation - Milipitas CA

International Classification:

G05F 1/44

US Classification:

323272, 323906, 307 51

Abstract:

An analog control circuit is coupled to an apparatus having a variable characteristic over an operating range. A sensing circuit is coupled to the apparatus and the control circuit during the range of operation of the apparatus and is operative to sense the variable characteristic. The operating parameter of the apparatus is controlled to be set at a level corresponding to a prescribed criterion, which may be a maximum or minimum, of the characteristic sensed over the range of operation.

US Patent:

8525438, Sep 3, 2013

Filed:

May 18, 2011

Appl. No.:

13/110724

Inventors:

Eugene L Cheung - Fremont CA, US
David J Chen - San Jose CA, US

Assignee:

Jade Sky Technologies, Inc. - San Jose CA

International Classification:

H05B 37/02

US Classification:

315291, 315297, 315307

Abstract:

Methods and apparati for forcing the current through a load () in a variable DC electrical circuit to be proportional to the input voltage (V(in)). A circuit embodiment of the present invention comprises a source () of input AC; a rectifier () coupled to the input AC source (), said rectifier () producing a variable DC input voltage; coupled to the rectifier (), a load () having a variable direct current flowing therethrough; and means (-) for forcing the current through the load () to be proportional to the variable DC input voltage.

US Patent:

8581498, Nov 12, 2013

Filed:

Feb 10, 2012

Appl. No.:

13/370884

Inventors:

Eugene L. Cheung - Fremont CA, US
David J. Chen - San Jose CA, US
David C. Tournatory - San Francisco CA, US

Assignee:

Jade Sky Technologies, Inc. - San Jose CA

International Classification:

H05B 37/00
H05B 41/00

US Classification:

315121, 315119, 315224, 315291, 315297

Abstract:

Methods and apparati for controlling bleed current (IBLEED) in a driver circuit () for a lighting device (). A method embodiment of the present invention comprises the steps of coupling a dimmer () to an input of the driver circuit (), and forcing the bleed current (IBLEED) to be inversely proportional to the time-averaged voltage (VLEDP) at said lighting device (). The dimmer () consumes power even when the lighting device () is not emitting light.

US Patent:

20060097705, May 11, 2006

Filed:

Nov 5, 2004

Appl. No.:

10/981488

Inventors:

Eugene Cheung - Fremont CA, US
Talbott Houk - Monte Sereno CA, US

International Classification:

G05F 1/656

US Classification:

323222000

Abstract:

Pulse width modulation of the connection of a load output terminal to a power supply terminal is effected. In response to a first level of the pulse width modulated signal, the load is disconnected from the power supply terminal, steady-state load voltage is preserved on a capacitor connected between a load output terminal and a power supply terminal, and steady-state load current information is held on a capacitor within the feedback loop. In response to a second level of the pulse width modulated signal, the load is reconnected to the power supply terminal, and load voltage and current instantaneously resume at their correct steady-state values.

US Patent:

20140078412, Mar 20, 2014

Filed:

Mar 15, 2013

Appl. No.:

13/843426

Inventors:

Ming Leong - Saratoga CA, US
Kristina A. Babiarz - San Jose CA, US
Amy Qian - San Jose CA, US
Kevin David Gibbs - San Carlos CA, US
Eugene C. Cheung - San Francisco CA, US

Assignee:

APPLE INC. - Cupertino CA

International Classification:

G06F 1/16
C03C 17/00
C03C 21/00

US Classification:

349 12, 427 58, 427108

Abstract:

Transparent articles for use as outer surfaces of electronic devices and methods therefor are disclosed. A transparent cover can be provided over a display of portable electronic device to provide a protective outer cover over the display. The transparent cover can include material to mark, mask or color a portion of the transparent cover, such portion thereupon becoming opaque. The material can be provided in a recessed portion of an inner surface of the transparent cover, such portion being a portion of the transparent cover that is not over a usable portion of the display. The electronic device can, for example, be a portable electronic device.

US Patent:

20230074849, Mar 9, 2023

Filed:

Sep 8, 2021

Appl. No.:

17/469673

Inventors:

- Cupertino CA, US
Brian S. Pearson - San Fransisco CA, US
Dong Zheng - Los Altos CA, US
Eugene C. Cheung - Redwood City CA, US
Kenneth J. Vampola - Los Altos CA, US

International Classification:

G06K 19/077
G09F 3/00
G06K 7/12

Abstract:

An electronic device may be attached to an external item. The electronic device may include an optical identification sensor configured to sense a color-encoded tag in the external item when the item is attached to the device. The optical identification sensor may include a board layer, a protective filter layer, wall structures for supporting the protective filter layer on the board layer, a linear array of photodetectors disposed between the board layer and the protective filter layer, a field-of-view restriction filter interposed between the photodetectors and the protective filter layer, and a light source having multiple emitters for illuminating the color-encoded tag. The emitters may be activated sequentially to produce multiple images that are combined to reconstruct an accurate reading of the color-encoded tag, which can then be used to identify the type of external item currently attached to the electronic device.

US Patent:

20210089168, Mar 25, 2021

Filed:

Dec 9, 2020

Appl. No.:

17/116907

Inventors:

- Cupertino CA, US
Eugene C. Cheung - Redwood City CA, US
Pey-Jiun Ko - Redwood City CA, US
Po-Jui Chen - Taipei City, TW
Robert W. Rumford - Santa Clara CA, US
Steve L. Terry - Cupertino CA, US
Wei Lin - Santa Clara CA, US
Xiaofan Niu - Campbell CA, US
Xiaoqi Zhou - Cupertino CA, US
Yi Gu - Palto Alto CA, US
Rasmi R. Das - Sunnyvale CA, US
Steven M. Scardato - Sunnyvale CA, US
Se Hyun Ahn - Cupertino CA, US
Victor H. Yin - Cupertino CA, US
Wookyung Bae - San Jose CA, US
Christopher L. Boitnott - Cupertino CA, US
Chun-Hao Tung - San Jose CA, US
Mookyung Son - Cupertino CA, US
Sunggu Kang - San Jose CA, US
Nathan K. Gupta - San Francisco CA, US
John Z. Zhong - Saratoga CA, US

International Classification:

G06F 3/044
G06F 3/041

Abstract:

An electronic device with a force sensing device is disclosed. The electronic device comprises a user input surface defining an exterior surface of the electronic device, a first capacitive sensing element, and a second capacitive sensing element capacitively coupled to the first capacitive sensing element. The electronic device also comprises a first spacing layer between the first and second capacitive sensing elements, and a second spacing layer between the first and second capacitive sensing elements. The first and second spacing layers have different compositions. The electronic device also comprises sensing circuitry coupled to the first and second capacitive sensing elements configured to determine an amount of applied force on the user input surface. The first spacing layer is configured to collapse if the applied force is below a force threshold, and the second spacing layer is configured to collapse if the applied force is above the force threshold.

US Patent:

20210091734, Mar 25, 2021

Filed:

Apr 23, 2020

Appl. No.:

16/856103

Inventors:

- Limerick, IE
Jeremy WONG - Sunnyvale CA, US
Eugene CHEUNG - Fremont CA, US
Brian HAMILTON - Menlo Park CA, US
Gregory FUNG - Fremont CA, US

Assignee:

Analog Devices International Unlimited Company - Limerick

International Classification:

H03F 3/45
H03F 3/68
H03F 1/02
H03M 1/12

Abstract:

A multi-stage transimpedance amplifier (TIA) with an adjustable input linear range is disclosed. The TIA includes a first stage, configured to convert a single-ended current signal from an optical sensor of a receiver signal chain to a single-ended voltage signal, and a second stage, configured to convert the single-ended voltage signal provided by the first stage to a differential signal. In such a TIA, the input linear range may be adjusted using a clamp that is programmable with an output offset current to keep the second stage of the TIA from overloading and to maintain a linear transfer function without compression.