John E Larson

US Patent:

7275292, Oct 2, 2007

Filed:

Mar 7, 2003

Appl. No.:

10/384199

Inventors:

Richard C. Ruby - Menlo Park CA, US
John D. Larson - Palo Alto CA, US
Paul D. Bradley - Mountain View CA, US

Assignee:

Avago Technologies Wireless IP (Singapore) Pte. Ltd. - Singapore

International Classification:

H04R 17/00
H01L 41/00
B05D 5/12

US Classification:

29 2535, 29594, 29846, 29947, 310321, 427100

Abstract:

Method for fabricating an acoustical resonator on a substrate having a top surface. First, a depression in said top surface is generated. Next, the depression is filled with a sacrificial material. The filled depression has an upper surface level with said top surface of said substrate. Next, a first electrode is deposited on said upper surface. Then, a layer of piezoelectric material is deposited on said first electrode. A second electrode is deposited on the layer of piezoelectric material using a mass load lift-off process.

US Patent:

7802349, Sep 28, 2010

Filed:

May 15, 2007

Appl. No.:

11/748970

Inventors:

Richard C. Ruby - Menlo Park CA, US
John D. Larson - Palo Alto CA, US
Paul D. Bradley - Mountain View CA, US

Assignee:

Avago Technologies Wireless IP (Singapore) Pte. Ltd. - Singapore

International Classification:

H01L 41/22
H01L 41/00

US Classification:

29 2535, 29594, 29846, 29847, 310321

Abstract:

Method for fabricating an acoustical resonator on a substrate having a top surface. First, a depression in said top surface is generated. Next, the depression is filled with a sacrificial material. The filled depression has an upper surface level with said top surface of said substrate. Next, a first electrode is deposited on said upper surface. Then, a layer of piezoelectric material is deposited on said first electrode. A second electrode is deposited on the layer of piezoelectric material using a mass load lift-off process.

US Patent:

8060086, Nov 15, 2011

Filed:

Nov 2, 2007

Appl. No.:

11/934408

Inventors:

Kosol Jintaseranee - Sunnyvale CA, US
Qiu Jin - Cupertino CA, US
Travis E. Dawson - San Francisco CA, US
Jing Jong Yea - Hillsborough CA, US
John N. Larson - Pacifica CA, US
Linda Chau - Fremont CA, US

Assignee:

Sprint Spectrum L.P. - Overland Park KS

International Classification:

H04W 4/00

US Classification:

455433, 455436, 370331

Abstract:

A method and apparatus for processing mobile-IP registration messages. Upon receipt of a mobile-IP registration request (RRQ) message that designates a care-of address matching the mobile-IP home agent's IP address, the RRQ would be dropped. Alternatively, before deciding to drop such an RRQ, the invention may further involve determining whether the home agent is currently functioning as a foreign agent for the requesting mobile node, which would justify the care-of address matching the home agent's IP address. If the home agent is not currently functioning as a foreign agent for the mobile node, then the RRQ would be dropped. On the other hand, if the home agent is currently functioning as a foreign agent for the mobile node, then RRQ processing would proceed as normal.

US Patent:

20020038989, Apr 4, 2002

Filed:

Nov 8, 2001

Appl. No.:

10/008838

Inventors:

John Larson - Palo Alto CA, US

International Classification:

H01L041/04

US Classification:

310/330000, 310/332000, 310/364000

Abstract:

An acoustic resonator includes a ferromagnetic compensator which at least partially offsets temperature-induced effects introduced by an electrode-piezoelectric stack. The compensator has a positive temperature coefficient of frequency, while the stack has a negative temperature coefficient of frequency. By properly selecting the thickness of the compensator, temperature-induced effects on resonance may be neutralized. Alternatively, the thickness can be selected to provide a target positive or negative composite temperature coefficient of frequency. In the preferred embodiment, the compensator is formed of a nickel-iron alloy, with the most preferred embodiment being one in which the alloy is approximately 35% nickel and approximately 65% iron. In order to prevent undue electromagnetic losses in the ferromagnetic compensator, a metallic flashing layer may be added to at least partially enclose the compensator.

US Patent:

20020070262, Jun 13, 2002

Filed:

Dec 9, 2000

Appl. No.:

09/733704

Inventors:

Paul Bradley - Mountain View CA, US
John Larson - Palo Alto CA, US
Richard Ruby - Menlo Park CA, US

International Classification:

H01L021/44
B23K035/12

US Classification:

228/179100, 228/180220, 029/025350, 438/118000

Abstract:

A device includes a die that contains a filter circuit. The filter is implemented using film bulk acoustic resonators. A package contains the die. The package includes a base portion. Signal paths are incorporated in the base portion. Solder joints attach the die to the base portion. The solder joints electrically connect pads on the die to the signal paths in the base portion. The solder joints do not include, and are used instead of, wire bonds.

US Patent:

20020079986, Jun 27, 2002

Filed:

Dec 21, 2000

Appl. No.:

09/746525

Inventors:

Richard Ruby - Menlo Park CA, US
John Larson - Palo Alto CA, US
Paul Bradley - Mountain View CA, US

International Classification:

H03H009/58

US Classification:

333/187000, 333/191000, 310/324000

Abstract:

A bulk acoustic resonator having a high quality factor is formed on a substrate having a depression formed in a top surface of the substrate. The resonator includes a first electrode, a piezoelectric material and a second electrode. The first electrode is disposed on the top surface of the substrate and extends beyond the edges of the depression by a first distance to define a first region therebetween. The piezoelectric material is disposed on the top surface of the substrate and over the first electrode, and the second electrode is disposed on the piezoelectric material. The second electrode includes a portion that is located above the depression. The portion of the second electrode that is located over the depression has at least one edge that is offset from a corresponding edge of the depression by a second distance to define a second region therebetween. The first and second regions have different impedances, as a result of the different materials located in the two regions. In addition, the first and second distances are approximately equal to a quarter-wavelength of a sound wave travelling laterally across the respective region, such that reflections off of the edges of the regions constructively interfere to maximize the reflectivity of the resonator.

US Patent:

20020121498, Sep 5, 2002

Filed:

Mar 5, 2001

Appl. No.:

09/799202

Inventors:

Paul Bradley - Mountain View CA, US
Richard Ruby - Menlo Park CA, US
John Larson - Palo Alto CA, US

International Classification:

C23C014/34

US Classification:

216/013000, 204/192180

Abstract:

A method for fabricating a resonator, and in particular, a thin film bulk acoustic resonator (FBAR), and a resonator embodying the method are disclosed. The resonator is fabricated on a substrate by fabricating a bottom electrode layer and a piezoelectric (PZ) layer over the bottom electrode layer. A selected portion of the PZ layer is partially etched. Then, a top electrode is fabricated over the selected portion of the PZ layer.

US Patent:

20020121499, Sep 5, 2002

Filed:

Mar 5, 2001

Appl. No.:

09/799205

Inventors:

Paul Bradley - Mountain View CA, US
John Larson - Palo Alto CA, US
Richard Ruby - Menlo Park CA, US

International Classification:

H01L021/302
H01B013/00
B23P015/00
G03C005/00
H01L021/02

US Classification:

216/013000, 216/017000, 204/192340, 204/192350, 430/318000, 438/584000, 438/754000

Abstract:

A method for fabricating a resonator, and in particular, a thin film bulk acoustic resonator (FBAR), and a resonator embodying the method are disclosed. An FBAR is fabricated on a substrate by reducing mass from a top electrode layer. For a substrate having multiple resonators, mass is reduced from only selected resonator to provide resonators having different resonance frequencies on the same substrate.

Address:

2308 S Riv Rock Dr, Papillion, NE 68046

VIN:

1YVHZ8BH1A5M40463

Make:

MAZDA

Model:

MAZDA6

Year:

2010