Weng Cho Chew, 71Lafayette, IN

7707527, Apr 27, 2010

Sep 27, 2007

11/862434

Lijun Jiang - Poughquag NY, US
Jason D. Morsey - Hopewell Junction NY, US
Barry J. Rubin - Croton-on-Hudson NY, US
Weng C. Chew - Champaign IL, US
Yuan Liu - Champaign IL, US

International Business Machines Corporation - Armonk NY
University of Illinois at Urbana—Champaign - Urbana IL

G06F 17/50

716 4, 716 5, 716 6, 703 13, 708446

A method for performing a signal integrity analysis on an integrated circuit (IC) that includes a plurality of scatterers by dividing the scatterers into subgroups using a nested Huygens' equivalence principle algorithm and solving a set of equations realized thereby with a reduced coupling matrix. The method includes decomposing the IC design into a plurality of small non-overlapping circuit sub-domains, wherein each of the sub-domains is formed as a small, enclosed region. Each sub-domain is analyzed independently of the other sub-domains using only electric fields to represent the interactions of each sub-domains with the other sub-domains as equivalent currents on equivalent surfaces of the plurality of sub-domains. Neighboring equivalent sub-domains are grouped together to form larger sub-domains using equivalent currents on equivalent surfaces to represent the interactions of the sub-domains. The steps of analyzing and grouping the sub-domains are repeated until the grouping approaches a box comprising the entire domain, and that the domain interactions between every sub-domain have been analyzed.

8146043, Mar 27, 2012

Mar 5, 2010

12/718309

Lijun Jiang - Poughquag NY, US
Jason D. Morsey - Hopewell Junction NY, US
Barry J. Rubin - Croton-On-Hudson NY, US
Weng C. Chew - Champaign IL, US
Yuan Liu - Champaign IL, US

International Business Machines Corporation - Armonk NY

G06F 17/50

716125, 716124, 716131, 716136, 703 13

A method for performing a signal integrity analysis on an integrated circuit (IC) that includes a plurality of scatterers by dividing the scatterers into subgroups using a nested Huygens' equivalence principle algorithm and solving a set of equations realized thereby with a reduced coupling matrix. The method includes decomposing the IC design into a plurality of small non-overlapping circuit sub-domains, wherein each of the sub-domains is formed as a small, enclosed region. Each sub-domain is analyzed independently of the other sub-domains using only electric fields to represent the interactions of each sub-domains with the other sub-domains as equivalent currents on equivalent surfaces of the plurality of sub-domains. Neighboring equivalent sub-domains are grouped together to form larger sub-domains using equivalent currents on equivalent surfaces to represent the interactions of the sub-domains. The steps of analyzing and grouping the sub-domains are repeated until the grouping approaches a box comprising the entire domain, and that the domain interactions between every sub-domain have been analyzed.

4857852, Aug 15, 1989

Apr 27, 1988

7/186986

Robert L. Kleinberg - Ridgefield CT
Brian Clark - Missouri City TX
Weng C. Chew - Champaign IL
David Mariani - Darien CT

Schlumberger Technology Corp. - New York NY

G01V 318
G01V 328

324339

A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated antenna probes and a logging apparatus with an improved means for generating and applying a reference signal used in phase detection.

4933638, Jun 12, 1990

Jun 19, 1989

7/368916

Robert L. Kleinberg - Ridgefield CT
Douglas D. Griffin - Bethel CT
Masafumi Fukuhara - Ridgefield CT
Weng C. Chew - Champaign IL
William E. Kenyon - Ridgefield CT
Peter I. Day - Ridgefield CT
Max Lipsicas - Redding CT

Schlumber Technology Corp. - New York NY

G01R 3320

324303

Borehole NMR logging apparatus and methods, and methods for the interpretation thereof. A logging tool is provided which produces a strong, static and homogeneous magnetic field B. sub. 0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focussed oscillating magnetic fields B. sub. 1 at said Volume to polarize or tip the magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B. sub. 1. Extremely rapid damping of the antenna between the transmitting and receiving modes of operation is accomplished by a Q-switch disclosed herein. The invention provides for the direct measurement of NMR decay having transverse relaxation time T. sub.

4766384, Aug 23, 1988

Jun 20, 1986

6/876514

Robert L. Kleinberg - Ridgefield CT
Brian Clark - Missouri City TX
Weng C. Chew - Champaign IL
David Mariani - Darien CT

Schlumberger Technology Corp. - New York NY

G01V 318
G01V 328
H01Q 1310

324339

A well logging apparatus is disclosed which employs slot antennas having a plurality of conductive probes traversing the slot. Also disclosed are a logging apparatus having electrically isolated antenna probes and a logging apparatus with an improved circuit for generating and applying a reference signal used in phase detection.

5055787, Oct 8, 1991

Dec 5, 1989

7/431368

Robert L. Kleinberg - Ridgefield CT
Douglas D. Griffin - Bethel CT
Masafumi Fukuhara - Ridgefield CT
Abdurrahman Sezginer - Ridgefield CT
Weng C. Chew - Champaign IL

Schlumberger Technology Corporation - New York NY

G01R 3320

324303

Borehole NMR logging apparatus and methods, and methods for the interpretation thereof. A logging tool is provided which produces a strong, static and homogeneous magnetic field B. sub. 0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focussed oscillating magnetic fields B. sub. 1 at said Volume to polarize or tip the magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B. sub. 1. Extremely rapid damping of the antenna between the transmitting and receiving modes of operation is accomplished by a Q-switch disclosed herein. The invention provides for the direct measurement of NMR decay having transverse relaxation time T. sub.

4851781, Jul 25, 1989

Apr 22, 1986

6/855119

Thomas L. Marzetta - Bethel CT
Weng C. Chew - Champaign IL

Schlumberger Technology Corporation - Ridgefield CT

G01V 320

324371

A method and apparatus investigating a circumferential segment of a borehole with an array of elements, which in effect spatially samples the segment, is described whereby, with a single circumferentially oriented array of spaced-apart elements sufficient overlap can be synthesized so as to reduce artifacts attributable to the spatial sampling. Measurements derived from circumferentially successive elements are combined, such as by summing to establish a desired overlap. In the described embodiment to a single lateral array of small electrodes is used to inject survey currents into the borehole wall and each current is measured. Measurements derived from pairs of successive survey currents are then summed to provide the desired overlap.