David M Mcdonald

US Patent:

7966722, Jun 28, 2011

Filed:

Jul 11, 2008

Appl. No.:

12/172079

Inventors:

David Hart - Cornelius OR, US
David McDonald - Hillsboro OR, US
Guillaume Bouche - Beaverton OR, US
Sudarsan Uppili - Portland OR, US

Assignee:

TriQuint Semiconductor, Inc. - Hillsboro OR

International Classification:

H05K 3/02

US Classification:

29847, 29832, 29831, 29852, 29846, 29 2535

Abstract:

Planarization methods for maintaining planar surfaces in the fabrication of such devices as BAW devices and capacitors on a planar or planarized substrate are described. In accordance with the method, a metal layer is deposited and patterned, and an oxide layer is deposited using a high density plasma chemical vapor deposition (HDP CVD) process to a thickness equal to the thickness of the metal layer. The HDP CVD process provides an oxide layer on the patterned metal tapering upward from the edge of the patterned metal layer. Then, after masking and etching the oxide layer from the patterned metal layer, the patterned metal layer and surrounding oxide layer form a substantially planar layer, interrupted by small remaining oxide protrusions at the edges of the patterned layer. These small remaining oxide protrusions may be too small to significantly disturb the flatness of a further oxide or other layer or they may be further mitigated by the application of another HDP CVD oxide film.

US Patent:

6140778, Oct 31, 2000

Filed:

Jun 6, 1995

Appl. No.:

8/466101

Inventors:

David A. Pringle - Pacific Palisades CA
David McDonald - Canyon Country CA
Zhong Fang Yan - Shangai, CN
George Johnson - Hollywood CA

International Classification:

H05B 3700

US Classification:

315289

Abstract:

Disclosed is a lower pressure xenon lamp (12) and the driver circuitry therefor for producing relatively short bursts of intense light from the lamp (12). The lamp (12), including its associated driver circuitry (50) can be used in theatrical, stage, movie and/or video production to simulate, among other things, bursts of lighting. The lamp (12) is installed in a fixture together with a power supply (20) and a control system (50) is provided for controlling when the lamp (12) is turned on and off. Preferably, the control system (50) includes manually operated switches (53, 57, 54) and preferably one or more controllers (50) can be coupled together in a series fashion, should it be desired to control the lamp (12) for a greater number of time cycles then permitted by a single controller (50). Alternative power supplies (20) are disclosed. One power supply (20) permits the intensity of the flashes of light (12) to be controlled.

US Patent:

59821124, Nov 9, 1999

Filed:

Mar 22, 1994

Appl. No.:

8/157119

Inventors:

David A. Pringle - Pacific Palisades CA
David McDonald - Canyon Country CA
Zhong Fang Yan - Shangai, CN
George Johnson - Hollywood CA

Assignee:

David A. Pringle - Pacific Palisades CA

International Classification:

H05B 3702

US Classification:

315289

Abstract:

Disclosed is a low pressure xenon lamp (12) and the driver circuitry therefor for producing relatively short bursts of intense light from the lamp (12). The lamp (12), including its associated driver circuitry (50) can be used in theatrical, stage, movie and/or video production to simulate, among other things, bursts of lighting. The lamp (12) is installed in a fixture together with a power supply (20) and a control system (50) is provided for controlling when the lamp (12) is turned on and off. Preferably, the control system (50) includes manually operated switches (53, 57, 54) and preferably one or more controllers (50) can be coupled together in a series fashion, should it be desired to control the lamp (12) for a greater number of time cycles then permitted by a single controller (50). Alternative power supplies (20) are disclosed. One power supply (20) permits the intensity of the flashes of light (12) to be controlled.

US Patent:

51500124, Sep 22, 1992

Filed:

Jun 7, 1991

Appl. No.:

7/712868

Inventors:

David A. Pringle - Pacific Palisades CA
David McDonald - Canyon Country CA
Zhong F. Yan - Shanghai, CN

International Classification:

H05B 4136

US Classification:

315200A

Abstract:

Disclosed is a low pressure xenon lamp and the driver circuitry therefore for producing relatively short bursts of intense light from the lamp. The lamp, including its associated driver circuitry, can be used in theatrical, stage, movie and/or video productions to simulate, among other things, bursts of lightning. The lamp is installed in a fixture together with a power supply and a control system is provided for controlling when the lamp is turned on and off. Preferably, the control system includes manually operated switches and preferably one or more controllers can be coupled together in a series fashion, should it be desired to control the lamp for a greater number of time cycles then permitted by a single controller.