Patents Represented by Attorney, Agent or Law Firm Gary J. Edwards
  • Patent number: 6533907
    Abstract: A specialized physical vapor deposition process provides dense amorphous semiconducting material with exceptionally smooth morphology. In particular, the process provides dense, smooth amorphous silicon useful as a hard mask for etching optical and semiconductor devices and as a high refractive index material in optical devices. DC sputtering of a planar target of intrinsic crystalline semiconducting material in the presence of a sputtering gas under a condition of uniform target erosion is used to deposit amorphous semiconducting material on a substrate. DC power that is modulated by AC power is applied to the target. The process provides dense, smooth amorphous silicon at high deposition rates. A method of patterning a material layer including forming a hard mask layer of amorphous silicon on a material layer according to the present DC sputtering process is also provided.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: March 18, 2003
    Assignee: Symmorphix, Inc.
    Inventors: Richard E. Demaray, Jesse Shan, Kai-An Wang, Ravi B. Mullapudi
  • Patent number: 6506289
    Abstract: Physical vapor deposition processes provide optical materials with controlled and uniform refractive index that meet the requirements for active and passive planar optical devices. All processes use radio frequency (RF) sputtering with a wide area target, larger in area than the substrate on which material is deposited, and uniform plasma conditions which provide uniform target erosion. In addition, a second RF frequency can be applied to the sputtering target and RF power can be applied to the substrate producing substrate bias. Multiple approaches for controlling refractive index are provided. The present RF sputtering methods for material deposition and refractive index control are combined with processes commonly used in semiconductor fabrication to produce planar optical devices such surface ridge devices, buried ridge devices and buried trench devices. A method for forming composite wide area targets from multiple tiles is also provided.
    Type: Grant
    Filed: July 10, 2001
    Date of Patent: January 14, 2003
    Assignee: Symmorphix, Inc.
    Inventors: Richard E. Demaray, Kai-An Wang, Ravi B. Mullapudi, Douglas P. Stadtler, Hongmei Zhang, Rajiv Pethe
  • Patent number: 6459097
    Abstract: A solid-state quantum computing structure includes a set of islands that Josephson junctions separate from a first superconducting bank. A d-wave superconductor is on one side of the Josephson junctions (either the islands' side or the bank's side), and an s-wave superconductor forms the other side of the Josephson junctions. The d-wave superconductor causes the ground state for the supercurrent at each junction to be doubly degenerate, with two supercurrent ground states having distinct magnetic moments. These quantum states of the supercurrents at the junctions create qubits for quantum computing. The quantum states can be uniformly initialized from the bank, and the crystal orientations of the islands relative to the bank influence the initial quantum state and tunneling probabilities between the ground states.
    Type: Grant
    Filed: January 7, 2000
    Date of Patent: October 1, 2002
    Assignee: D-Wave Systems Inc.
    Inventor: Alexandre M. Zagoskin
  • Patent number: 6438163
    Abstract: A receiver that calculates the length of the transmission channel cable based on the receiver parameters is presented. The cable length is calculated based on the gain of an automatic gain control circuit or is based on the multiplier coefficients of an equalizer of the receiver. A comparison between a cable length calculated using the gain from the automatic gain control circuit and a cable length calculated using the multiplier coefficients of the equalizer indicates the quality of the cable.
    Type: Grant
    Filed: September 25, 1998
    Date of Patent: August 20, 2002
    Assignee: National Semiconductor Corporation
    Inventors: Sreen A. Raghavan, Doug J Easton
  • Patent number: 6421381
    Abstract: A 100Base-TX detection system is presented which takes advantage of the form of the frequency response of the channel to provide a simplified filter for producing an output signal with reduced distortion. Utilizing the nature of the frequency response function of category-5 twisted pair cabling, a finite impulse response linear equalizer or an infinite impulse response decision feedback equalizer having as few as two multipliers is implemented.
    Type: Grant
    Filed: July 20, 2000
    Date of Patent: July 16, 2002
    Assignee: National Semiconductor Corporation
    Inventor: Sreen A. Raghavan
  • Patent number: 6418172
    Abstract: A Nearest Neighbors Look-Ahead Maximum Likelihood Estimation Sequence (LA-MLSE) algorithm for decoding data in a digital communications system forms the following three vectors to decode data: (1) a vector of the encoder input bit signals A=A{k, k+1, k+2}, (2) a vector of the noise-free encoder channel output signals Y=Y{A(k), A(k+1), A(k+2)}; and (3) a vector of the received signals R=R(A(k), A(k+1), A(k+2)). If the distance between the received signal R and at least one of the channel output vectors which are of the form Y{1, A(k+1), A(k+2)} is shorter than the distance between the received signal R and the Nearest Neighbor of the signal Y{1, A(k+1), A(k+2)}, then A(k) is decoded as 1.
    Type: Grant
    Filed: April 21, 1999
    Date of Patent: July 9, 2002
    Assignee: National Semiconductor Corporation
    Inventors: Sreen A. Raghavan, Hari Thirumoorthy
  • Patent number: 6415003
    Abstract: In a data communications system, a digitally implemented correction for baseline wander and the receipt of killer packets resulting from coupling transformers in the transmission channel is presented. The baseline wander correction is accomplished in a feedback loop that does not depend on models of the coupling transformers between the transmitter and the transport media and the receiver and the transport media. Additionally, a digital response to killer packets is presented that does not require the use of higher resolution analog-to-digital converters and does not require the use of a lower resolution in the analog-to-digital converter of the receiver. Instead, the reference voltage of the analog-to-digital converter is adjusted for short cables, where killer packets are a problem.
    Type: Grant
    Filed: September 11, 1998
    Date of Patent: July 2, 2002
    Assignee: National Semiconductor Corporation
    Inventor: Sreen A. Raghavan
  • Patent number: 6411073
    Abstract: A line locating device and method that is capable of determining the location of a line even when a significant amount of transmitted signal is coupled to neighboring lines. A device according to this invention includes a transmitter that couples a transmitted signal onto a metal line where the transmitted signal is a first signal having a carrier frequency modulated with second signal of a lower frequency. The device also includes a receiver that receives a received signal from the metal line and evaluates the signal in terms of period and polarity to determine an incoming signal or an outgoing signal. The receiver addresses an appropriate signaling unit in response to the incoming signal or the outgoing signal.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: June 25, 2002
    Assignee: Hagenuk KMT Kabelmesstechnik GmbH
    Inventors: Gerhard Fischer, Volker Fraedrich, Christoph Wendel
  • Patent number: 6407550
    Abstract: A line locator having the capability of determining the horizontal position with respect to a line is described. The line locator includes a left sensor and a right sensor of any orientation. The left sensor and the right sensor are coupled to a convolution amplifier that amplifies the sum of the output signals from the left sensor and the right sensor. The detection circuitry includes automatic gain control amplification where the automatic gain control signal is obtained digitally from a digital controller. In addition, the detection circuitry includes phase detection circuitry where the phase reference signal is obtained from an external transmitter that is coupled to the line. In addition, the AGC signal and the phase reference signal may both be obtained by processing output signals from magnetic field detectors in the line locator.
    Type: Grant
    Filed: August 19, 1998
    Date of Patent: June 18, 2002
    Assignee: Metrotech Corporation
    Inventors: Gopalakrishnan R. Parakulam, Stevan Polak
  • Patent number: 6398424
    Abstract: A multi-channel optical connector that includes a multi channel optical fiber block including at least one optical fiber capable of being optically coupled to at least one optical device. The multi-channel optical fiber block is incorporated in a plastic molding that is complimentary in shape to that of an optical device array block, and thus can be plugged into the optical device array block. The close tolerances maintained in manufacturing of the connector results in accurate alignment of the fibers captured in the multi-channel optical fiber block with the optical devices in the optical device array block. The close tolerances can be achieved by using MEMS (Micro Electro Mechanical System) processing techniques to manufacture the V-grooves in a silicon V-block, which is part of the multi-channel optical fiber block. Alternatively, V-grooves can be produced in the multi-channel optical fiber block by plastic molding.
    Type: Grant
    Filed: June 30, 2000
    Date of Patent: June 4, 2002
    Assignee: PhotonAge, Inc.
    Inventors: Yong-Sung Jin, Hyung-Jae Lee, Yung-Sung Son
  • Patent number: 6332176
    Abstract: A device controller for interfacing a host computer with an external storage device has an autohost controller. The device controller, at the end of a read operation, fills a memory buffer with data blocks contiguous with the read operation. On a subsequent read operation, the autohost controller checks the subsequent read operation and, if the requested data is within the memory buffer, directs the device controller to transfer the data from the memory buffer without intervention from an external microprocessor. If the autohost controller does not intervene, the device controller operates under the control of the microprocessor, as normal.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: December 18, 2001
    Assignees: Integrated Memory Logic, Inc.
    Inventors: Cheng-Chi Fang, Chao-I Chang, Ka Kit Ling
  • Patent number: 6327642
    Abstract: A memory system having a main memory which is coupled to a plurality of parallel virtual access channels. Each of the virtual access channels provides a set of memory access resources for controlling the main memory. These memory access resources include, interfaces, cache resources (including cache chaining), burst mode operation control and precharge operation control. A plurality of the virtual access channels are cacheable virtual access channels, each of which includes a channel row cache memory for storing one or more cache entries and a channel row address register for storing corresponding cache address entries. One or more non-cacheable virtual access channels are provided by a bus bypass circuit. Each virtual access channel is independently addressable, such that particular memory masters can be assigned to access particular virtual access channels.
    Type: Grant
    Filed: November 10, 1999
    Date of Patent: December 4, 2001
    Assignee: NEC Electronics, Inc.
    Inventors: Jeffery H. Lee, Manabu Ando
  • Patent number: 6288782
    Abstract: A method is described for characterizing defects on a test surface of a semiconductor wafer using a confocal-microscope-based automatic defect characterization (ADC) system. The surface to be tested and a reference surface are scanned using a confocal microscope to obtain three-dimensional images of the test and reference surfaces. The test and reference images are converted into sets of geometric constructs, or “primitives,” that are used to approximate features of the images. Next, the sets of test and reference primitives are compared to determine whether the set of test primitives is different from the set of reference primitives. If such a difference a exists, then the difference data is used to generate defect parameters, which are then compared to a knowledge base of defect reference data. Based on this comparison, the ADC system characterizes the defect and estimates a degree of confidence in the characterization.
    Type: Grant
    Filed: May 5, 1999
    Date of Patent: September 11, 2001
    Assignee: Ultrapointe Corporation
    Inventors: Bruce W. Worster, Ken K. Lee
  • Patent number: 6278864
    Abstract: A compact low-power radio frequency (RF) transceiver with a built-in antenna provides wireless communication between a computer and another device. A direct conversion receiver together with a voltage controlled oscillator, phase lock loop circuits, digitally controlled divider circuits and a patch antenna are packaged into a compact enclosure, having dimensions within the PCMCIA format. In some embodiments, the transceiver enters a sleep mode whenever it is idle in order to further conserve power. In other embodiments, a signature detector enables the transceiver to distinguish between noise and valid messages by recognizing a signature word embedded in the data packet.
    Type: Grant
    Filed: September 21, 1999
    Date of Patent: August 21, 2001
    Assignee: Fujitsu Limited (Japan)
    Inventors: James D. Cummins, Bradley E. Thomson, William F. Kern, Duong X. Dinh
  • Patent number: 6176265
    Abstract: Pick-up tools and other devices for handling semiconductor wafers are require to be capable of withstanding corrosive chemical substances and extreme temperatures, and the valve unit for use in such devices must meet these requirements. The valve unit is also desired to be free from electrostatic charging. To this end, the valve unit comprises a valve main body, having a valve seat defined therein, which is made of relatively electroconductive and self-lubricating material such as PTFE, and a valve case which is injection molded around the valve unit and made of a material having some electroconductivity and a high resistance against deformation such as PEEK mixed with carbon fibers. Provision of annular grooves on the outer surface of the valve main body improves the attachment between the valve main body and the valve case so as to improve both the sealing performance and the mechanical integrity of the valve unit.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: January 23, 2001
    Inventors: Kiyoshi Takahashi, Kazuo Takahashi
  • Patent number: 6014397
    Abstract: A coated ceramic insulator in a laser chamber that is exposed to a gaseous environment where impurities in the ceramic insulator are prevented from detrimentally contaminating the laser chamber by a high-purity insulating coating. The insulating coating prevents chemical interactions between the ceramic insulator and the gaseous environment. In particular, the coating prevents contamination, by impurities in the ceramic insulator, of the lasing gas.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: January 11, 2000
    Assignee: Cymer, Inc.
    Inventors: Toshihiko Ishihara, Richard G. Morton