Patents Assigned to Agere Systems Guardian Corp.
  • Patent number: 7102732
    Abstract: Various options for improving throughput in an e-beam lithography apparatus are described. A slider lens moves in synchronism with the scanning motion of the electron beam.
    Type: Grant
    Filed: April 28, 2003
    Date of Patent: September 5, 2006
    Assignees: Elith LLC, Agere Systems Guardian Corp.
    Inventors: Pieter Willem Herman de Jager, Pieter Kruit, Arno Jan Bleeker, Karel Diederick van der Mast
  • Publication number: 20040159862
    Abstract: The present invention provides a method of manufacturing an interdigitated semiconductor device. In one embodiment, the method comprises simultaneously forming first electrodes adjacent each other on a substrate, forming a dielectric layer between the first electrodes, and creating a second electrode between the first electrodes, the second electrode contacting the dielectric layer between the first electrodes to thereby form adjacent interdigitated electrodes. An interdigitated capacitor and a method of manufacturing an integrated circuit having an interdigitated capacitor are also disclosed.
    Type: Application
    Filed: February 11, 2004
    Publication date: August 19, 2004
    Applicant: Agere Systems Guardian Corp.
    Inventors: Christopher D.W. Jones, Donald W. Murphy, Yiu-Huen Wong
  • Publication number: 20040070812
    Abstract: A drive circuit for a MEMS device, an integrated circuit having a plurality of MEMS devices and drivers, a method of operating the drive circuit and a method of manufacturing the integrated circuit. In one embodiment, the drive circuit includes: (1) an electrode driver and (2) a switching network, coupled to an output of said electrode driver that: (a) in a first configuration, couples said output to a first electrode of an axis of said MEMS device and grounds an opposing second electrode of said axis of said MEMS device and (b) in a second configuration, couples said output to said second electrode and grounds said first electrode.
    Type: Application
    Filed: December 7, 2001
    Publication date: April 15, 2004
    Applicants: Agere Systems Guardian Corp., Lucent Technologies, Inc.
    Inventors: Marek M. Furyk, Khanh C. Nguyen, Andrew P. Sabol, Xiaoqing Yin
  • Patent number: 6675450
    Abstract: A method of producing and mounting electronic devices to negate the effects of parasitics on device performance. In one aspect, the substrate surface of the device is coated with a thin, etch-resistant film during fabrication that acts as a barrier to allow removal of substrate material beneath the film, creating a suspended structure upon which the remaining layers of circuitry rest. Alternatively the device is made with a film that is integral to the device, and that acts as the supporting membrane. To mount the device on a carrier or package, solder bumps are applied near the ends of the conductors of the device, and the die is then secured to a carrier or package, and positioned so that leads extending from the conductors mate up with bonding strips on the carrier or package. The solder bumps are then reflowed or melted to establish electrical connection between leads of the device and corresponding bonding strips of the carrier.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: January 13, 2004
    Assignee: Agere Systems Guardian Corp.
    Inventors: Linus Albert Fetter, Yiu-Huen Wong, Michael George Zierdt
  • Patent number: 6674291
    Abstract: The effects of electromigration have been shown to lead to damage of metal electrodes of electronic devices such as thin film resonator (TFR) devices in only a few hours, for a test input power that is within the operational range of these devices. It has been determined that this failure is sensitive to the frequency of the input power. The present invention provides a method and apparatus for determining high power reliability in electronic devices, so as to enable an accurate determination of the failure time of the electronic device, and hence projected lifetime. This determination is independent from the frequency of an input power applied to the electronic device as part of the method for testing the device. Based on the above results, a TFR device has been developed, which includes a protective or electromigration-reducing layer such as titanium being deposited atop an electrode of the device.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: January 6, 2004
    Assignee: Agere Systems Guardian Corp.
    Inventors: Bradley Paul Barber, Peter Ledel Gammel, Juan A. Herbsommer, Hugo F. Safar, Yiu-Huen Wong
  • Publication number: 20040002317
    Abstract: A communication system with variable filter bandwidth includes a first mixer circuit configured to receive a communication signal and shift the frequency range of the communication signal to a first frequency range. A second mixer circuit is configured to receive the same communication signal and shift the frequency range of the communication signal to a second frequency range. An activation circuit is coupled to the first and second mixer circuits so as to provide an activation signal that activates at least one of the mixer circuits. A plurality of filter circuits are provided such that each filter circuit is configured to receive a signal from a corresponding mixer circuit, when said corresponding mixer circuit is activated.
    Type: Application
    Filed: June 27, 2003
    Publication date: January 1, 2004
    Applicant: Agere Systems Guardian Corp.
    Inventor: Erik Busking
  • Patent number: 6639710
    Abstract: An adaptive optics system is disclosed whereby at least one mirror in the system is manipulated using electrostatic force to selectively attract or repel a portion of the mirror to or from a particular electrode, respectively. This attraction or repulsion is accomplished by mechanically coupling a bound charge layer of dielectric material to at least one surface of the mirror and then placing a voltage across an electrode in an array of electrodes positioned near that mirror. The charge in the dielectric material combined with a suitable electric field makes it possible to attract portions of the mirror in one instant and then, by changing the sign on the voltage placed across the electrode, to repel those same portions in the next instant.
    Type: Grant
    Filed: September 29, 2001
    Date of Patent: October 28, 2003
    Assignees: Lucent Technologies Inc., Agere Systems Guardian Corp.
    Inventors: Peter Kurczynski, John Anthony Tyson
  • Publication number: 20030179973
    Abstract: The present invention provides an optical modulator, a method of manufacture therefore, and an optical communications system including the optical modulator. The optical modulator may include a substrate, a waveguide located within the substrate and electrodes located over the substrate. Additionally, the waveguide includes a first doped region and a second doped region that overlaps the first doped region and is located adjacent an outer surface of the substrate and the electrodes.
    Type: Application
    Filed: March 19, 2002
    Publication date: September 25, 2003
    Applicant: Agere Systems Guardian Corp.
    Inventors: Shinichi Shimotsu, Rangaraj Madabhushi
  • Publication number: 20030179431
    Abstract: The invention addresses a micro-electro-mechanical (MEMS) device, or an array of such devices, for use in an optical communication system and a method of manufacture therefore. An embodiment of the device includes a moveable element support structure, a moveable element and torsional members that couple the moveable element support structure and the moveable element and allow the moveable element to gimbal with respect to the support structure. The inventive device includes torsional members that are substantially free of corrosion thereby producing a device with improved response characteristics. The method includes using an etchant that substantially inhibits corrosion of the torsional members.
    Type: Application
    Filed: March 21, 2002
    Publication date: September 25, 2003
    Applicants: Lucent Technologies, Inc., Agere Systems Guardian Corp.
    Inventors: Vladimir A. Aksyuk, Arman Gasparyan, Mark A. Paczkowski
  • Patent number: 6625278
    Abstract: An AC impedance matching architecture which provides programmable AC impedance matching in a given range using a digital filter to filter a signal fed back from the impedance matched line to generate an AC impedance emulation control signal. The AC impedance emulation control signal is combined with a transmit signal (if desired) and drives a voltage controlled current source, which is in parallel with a reference impedance. A voltage is developed across the reference impedance to drive, e.g., the telephone line. The reference impedance is chosen based on a desired maximum AC impedance. The gain of the digital filter, a first order sigma delta filter in the disclosed embodiment, is chosen based on the desired value of the AC impedance. The transfer function of the digital filter is derived based on a desired AC impedance.
    Type: Grant
    Filed: August 24, 1999
    Date of Patent: September 23, 2003
    Assignee: Agere Systems Guardian Corp.
    Inventors: Paul D. Hendricks, Donald R. Laturell, Lane A. Smith, Steven B. Witmer
  • Publication number: 20030163675
    Abstract: A context switching system for a multi-thread execution pipeline loop having a pipeline latency and a method of operation thereof. In one embodiment, the context switching system includes a context switch requesting subsystem configured to: (1) detect a device request from a thread executing within the multi-thread execution pipeline loop for access to a device having a fulfillment latency exceeding the pipeline latency, and (2) generate a context switch request for the thread. The context switching system further includes a context controller subsystem configured to receive the context switch request and prevent the thread from executing until the device request is fulfilled.
    Type: Application
    Filed: February 25, 2002
    Publication date: August 28, 2003
    Applicant: Agere Systems Guardian Corp.
    Inventors: Victor A. Bennett, Sean W. McGee
  • Publication number: 20030141566
    Abstract: The present invention provides a method of manufacturing a semiconductor device. The method may include forming first and second adjacent tubs in an epitaxial layer, and simultaneously forming a base region in the first tub and lightly doped drain (LDD) regions in the second tub adjacent a first gate located over the second tub. The method may also include simultaneously forming a base contact region and a source/drain contact region.
    Type: Application
    Filed: January 25, 2002
    Publication date: July 31, 2003
    Applicant: Agere Systems Guardian Corp.
    Inventors: John C. Desko, Chung-Ming Hsieh, Bailey Jones, Thomas J. Krutsick, Brian E. Thompson, Steve Wallace
  • Publication number: 20030141876
    Abstract: A circuit for, and method of, measuring an extinction ratio of a laser diode and a laser diode transmitter incorporating the circuit or the method. In one embodiment, the circuit includes: (1) an RF power detector, optically couplable to an output of the laser diode, for producing a varying voltage that is a function of an AC portion of modulated power generated by the laser diode and (2) an error signal generator, coupled to the power detector, for integrating the varying voltage over time to yield an integrated DC voltage that is a function of the extinction ratio.
    Type: Application
    Filed: January 29, 2002
    Publication date: July 31, 2003
    Applicant: Agere Systems Guardian Corp.
    Inventors: Daniel Mahgerefteh, Eva Peral
  • Patent number: 6599837
    Abstract: The present invention provides a chemical mechanical planarization (CMP) polishing composition that polishes metal layers at a good removal rate and that provides good planarization of metal layers in a process that can be readily controlled. The CMP polishing composition of the present composition includes a plurality of abrasive particles, a triazole or a triazole derivative, a ferricyanide salt oxidizing agent and water and has a pH of from about 1 to about 6. In addition, the present invention includes a method for removing at least a portion of a metallization layer by polishing a metallization layer using the CMP polishing composition of the invention.
    Type: Grant
    Filed: February 29, 2000
    Date of Patent: July 29, 2003
    Assignee: Agere Systems Guardian Corp.
    Inventors: Sailesh Mansinh Merchant, Sudhanshu Misra, Pradip Kumar Roy
  • Publication number: 20030133525
    Abstract: A method and apparatus for determining frame alignment in a discrete multitone transceiver by determining a rotation of the coefficients of the shortening channel impulse response for which inter symbol interference (ISI) is minimal. The ISI is determined by multiplying the average value of a transmitted discrete multitone symbol and multiplying it by the coefficients of the shortening channel impulse response in a given rotation.
    Type: Application
    Filed: January 15, 2002
    Publication date: July 17, 2003
    Applicant: Agere Systems Guardian Corp.
    Inventor: Yhean-Sen Lai
  • Patent number: 6569690
    Abstract: Method for fabricating a structure. According to an exemplary embodiment, a structure is made by forming a layer of removable material with a first surface spaced a part from a second surface. The first surface is formed along a first region from which the material is removable. The first surface is altered by removal of material from the layer. Removed material from the first surface is monitored to detect fluctuations in a variable of composition in the layer, and removal of material from the first surface is terminated when the composition of monitored material meets a predetermined criterion. In an alternate embodiment a variable characteristic is imparted to a layer of material as a function of layer thickness and an operation is performed on the layer resulting in removal of material. Samples of removed material are monitored for variation in the characteristic and the operation is modified when a variation conforms with a criterion.
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: May 27, 2003
    Assignee: Agere Systems Guardian Corp
    Inventors: Erik Cho Houge, Isik C. Kizilyalli, John Martin McIntosh, Fred Anthony Stevie, Catherine Vartuli
  • Publication number: 20030095001
    Abstract: A balancing circuit and method of operation thereof for use with a circuit having first and second complementary drivers exhibiting different current gain characteristics. In one embodiment, the balancing circuit includes a sensing subcircuit that provides a correction signal indicating a first current gain characteristic of the first driver. The balancing circuit also includes a compensation subcircuit that generates a current gain compensation signal to the first driver to substantially match a second current gain characteristic of the second driver based on the correction signal.
    Type: Application
    Filed: November 16, 2001
    Publication date: May 22, 2003
    Applicant: Agere Systems Guardian Corp.
    Inventors: Paul C. Davis, Irving G. Post
  • Patent number: 6550280
    Abstract: The invention involves fabricating a ceramic tube, e.g., a silica overcladding tube, with very little bow, e.g., about 0.3 mm per meter or less. In particular, the invention involves securing the tube by a handle that both allows the tube to hang plumb during treatment, and also is capable of deforming during such heat treatment to maintain the plumb arrangement.
    Type: Grant
    Filed: December 13, 1999
    Date of Patent: April 22, 2003
    Assignee: Agere Systems Guardian Corp.
    Inventors: Eric M Monberg, Frederick W. Walz, Jr.
  • Patent number: 6552844
    Abstract: An optical amplifier and communications system for amplifying an input signal and providing an output signal includes a nonlinear light absorber for passively controlling the level of the output signal. The nonlinear light absorber provides an approximately constant output signal level independent of the level of the input signal.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: April 22, 2003
    Assignee: Agere Systems Guardian Corp.
    Inventor: Jin Hong Lim
  • Publication number: 20030072380
    Abstract: A method and apparatus for reducing cross-talk in a communication system propagating respective sets of in-phase and quadrature signals by processing at least one set of I and Q signals according to a respective pre-coding matrix and adapting the pre-coding matrix in response to differences between expected received signals and actual received signals.
    Type: Application
    Filed: October 11, 2001
    Publication date: April 17, 2003
    Applicant: Agere Systems Guardian Corp.
    Inventor: Gang Huang