Patents by Inventor William C. Alexander

William C. Alexander has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7138791
    Abstract: Methods and apparatuses for a low EMI power supply. The power supply may include a control circuit, a power switch connected to the control circuit, an anti-parallel diode connected to the power switch, an inductor coupled to the anti-parallel diode, an output diode coupled to the inductor, and an output capacitor connected to the output diode. The power supply may include a series diode and no anti-parallel diode. The power supply provides a controllable and variable high voltage power supply from a small number of devices while, at the same time, producing low EMI. Power conversion is achieved at high efficiencies due to the recycling of energy in parasitic capacitance. Due to its low EMI, the power supply is particularly well suited for driving electronic devices such as avalanche photodiodes.
    Type: Grant
    Filed: June 21, 2005
    Date of Patent: November 21, 2006
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: William C. Alexander
  • Patent number: 6909267
    Abstract: Methods and apparatuses for a low EMI power supply. The power supply may include a control circuit, a power switch connected to the control circuit, an anti-parallel diode connected to the power switch, an inductor coupled to the anti-parallel diode, an output diode coupled to the inductor, and an output capacitor connected to the output diode. The power supply may include a series diode and no anti-parallel diode. The power supply provides a controllable and variable high voltage power supply from a small number of devices while, at the same time, producing low EMI. Power conversion is achieved at high efficiencies due to the recycling of energy in parasitic capacitance. Due to its low EMI, the power supply is particularly well suited for driving electronic devices such as avalanche photodiodes.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: June 21, 2005
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: William C. Alexander
  • Patent number: 6898700
    Abstract: The present invention discloses a method and apparatus for saving and restoring registers. A single instruction is decoded. The single instruction moves contents of a plurality of registers associated with a functional unit in a processor to a memory; the processor operates under a plurality of operational modes and operand sizes. The single instruction arranges the contents in the memory according to a predetermined format into a plurality of groups, each group is aligned at an address boundary which corresponds to a multiple of 2N bytes. The predetermined format is constant for the plurality of operational modes and operand sizes. The single instruction retains the contents of the plurality of registers after moving.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: May 24, 2005
    Assignee: Intel Corporation
    Inventors: William C. Alexander, III, Shreekant S. Thakkar, Patrice L. Roussel, Thomas Huff, Bryant E. Bigbee, Stephen A. Fischer
  • Patent number: 6870358
    Abstract: Digital peak detection among multiple signals, or inputs. In one embodiment, a detection method that includes receiving multiple digitized input signals. For each digitized input signal, the method also includes noting a first data value associated with the digitized input signal at a first time. The method includes comparing the first data values to determine a largest first data value from among the first data values. For each digitized input signal, the method includes noting a second data value associated with the digitized input signal at a second time. The method includes comparing the second data values to determine a largest second data value from among the second data values. The method includes comparing the largest second data value with a threshold data value. The method includes detecting a peak when the largest second data value is greater than the threshold data value, and less than the largest first data value.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: March 22, 2005
    Assignee: BAES Systems Information and Electronic Systems Integration Inc.
    Inventor: William C. Alexander
  • Publication number: 20040176919
    Abstract: Digital peak detection among multiple signals, or inputs. In one embodiment, a detection method that includes receiving multiple digitized input signals. For each digitized input signal, the method also includes noting a first data value associated with the digitized input signal at a first time. The method includes comparing the first data values to determine a largest first data value from among the first data values. For each digitized input signal, the method includes noting a second data value associated with the digitized input signal at a second time. The method includes comparing the second data values to determine a largest second data value from among the second data values. The method includes comparing the largest second data value with a threshold data value. The method includes detecting a peak when the largest second data value is greater than the threshold data value, and less than the largest first data value.
    Type: Application
    Filed: December 31, 2002
    Publication date: September 9, 2004
    Applicant: BAE SYSTEMS Information and Electronic Systems Integration Inc.
    Inventor: William C. Alexander
  • Publication number: 20040156457
    Abstract: In one embodiment, a method that includes detecting a level on each of a plurality of data channels; summing the levels of a subset of data channels to get a summed level, the subset of data channels containing the lowest levels present in the plurality of data channels; comparing the summed level with the highest level present in the plurality of data channels; and rejecting a common mode interference in each of the plurality of data channels if the summed level exceeds the highest level present in the plurality of data channels. In another embodiment, an apparatus that includes a plurality of data channels; an array of input filters coupled to the plurality of data channels; a pulse detection circuit coupled to the array of input filters; a common mode rejection circuit coupled to the pulse detection circuit; and a pulse data queuing and transmission circuit coupled to the common mode rejection circuit. Other methods and apparatuses are disclosed.
    Type: Application
    Filed: July 25, 2003
    Publication date: August 12, 2004
    Inventor: William C. Alexander
  • Publication number: 20040125119
    Abstract: In one embodiment, a method that includes creating a filter structure using a parameter of a periodic pulse train, the filter structure having a plurality of time slots, each time slot being associated with a memory value; receiving a pulse at a time; incrementing the memory value associated with the time slot corresponding to the time the pulse was received; filtering the pulse if the memory value exceeds a threshold; and transmitting the pulse to a processor if the memory value does not exceed the threshold. In another embodiment, an apparatus that includes an input filter; a pulse detection circuit coupled to the input filter; a periodic pulse filter coupled to the pulse detection circuit; and a pulse queuing and transmission circuit coupled to the periodic pulse filter. Other embodiments are disclosed.
    Type: Application
    Filed: July 25, 2003
    Publication date: July 1, 2004
    Inventor: William C. Alexander
  • Publication number: 20030160596
    Abstract: Methods and apparatuses for a low EMI power supply. In one embodiment, the power supply includes a control circuit, a power switch connected to the control circuit, an anti-parallel diode connected to the power switch, an inductor coupled to the anti-parallel diode, an output diode coupled to the inductor, and an output capacitor connected to the output diode. In another embodiment, the power supply includes a series diode and no anti-parallel diode. The power supply provides a controllable and variable high voltage power supply from a small number of devices while, at the same time, producing low EMI. Power conversion is achieved at high efficiencies due to the recycling of energy in parasitic capacitance. Due to its low EMI, the power supply is particularly well suited for driving electronic devices such as avalanche photodiodes.
    Type: Application
    Filed: December 20, 2002
    Publication date: August 28, 2003
    Applicant: BAE SYSTEMS Information
    Inventor: William C. Alexander
  • Patent number: 5721857
    Abstract: A method is provided for recovering the effective address of memory instructions in an out-of-order microprocessor for use by an exception handler upon the occurrence of one of an exception and a systems management interrupt. The microprocessor comprises at least one execution unit for executing a plurality of instructions out-of-order and a re-order buffer having storage locations for buffering result data produced from the execution of the plurality of instructions. Each instruction is associated with a location designator to identify a unique storage location within the re-order buffer in which the result data for an executed instruction is written. The microprocessor further comprises a memory order buffer having storage locations for buffering memory instructions waiting for access to memory for execution, these storage locations also being identified by corresponding location designators.
    Type: Grant
    Filed: May 22, 1996
    Date of Patent: February 24, 1998
    Assignee: Intel Corporation
    Inventors: Andrew F. Glew, Jeffrey M. Abramson, Kris G. Konigsfeld, Atiq Bajwa, Warren R. Morrow, William C. Alexander, III
  • Patent number: 4716515
    Abstract: A switched capacitor, induction motor drive circuit is provided wherein a switched capacitor in parallel with the inductive motor load at each output terminal is provided for commutation or switching of the main output inverter elements thereby protecting the switching elements from excessive voltage during switching or commutation operation in combination with a unique switching control circuit which enables minimal voltage switching elements to be used and which eliminates the need for anti-parallel rectifiers in the inverter output stage. Alternate forms of the switching control circuit are disclosed. Regeneration induced power control circuits for dissipating or returning the power to the input lines are disclosed.
    Type: Grant
    Filed: June 18, 1986
    Date of Patent: December 29, 1987
    Assignee: Solar Refining, Inc.
    Inventor: William C. Alexander
  • Patent number: 4597039
    Abstract: A switched capacitor, induction motor drive circuit is provided wherein a switched capacitor in parallel with the inductive motor load at each output terminal is provided for commutation or switching of the main output inverter elements thereby protecting the switching elements from excessive voltage during switching or commutation operation in combination with a unique switching control circuit which enables minimal voltage switching elements to be used and which eliminates the need for anti-parallel rectifiers in the inverter output stage.
    Type: Grant
    Filed: June 4, 1984
    Date of Patent: June 24, 1986
    Assignee: Solar Refining, Inc.
    Inventor: William C. Alexander
  • Patent number: 4318394
    Abstract: A solar energy concentrator is provided which includes a flexible reflective surface to focus solar flux on absorber tubes. The surface is mounted above a plurality of partially evacuated chambers. As the relative position between the sun and the concentrator change, the position of the absorber tubes and curvature of the reflective surface are changed to maintain an optimum reflective surface curvature for solar energy concentration.
    Type: Grant
    Filed: January 11, 1980
    Date of Patent: March 9, 1982
    Inventor: William C. Alexander
  • Patent number: 4275376
    Abstract: A signal communicator for transmitting an electrical signal from one member rotating relative to another member is in the configuration of a journal bearing and comprises at least one conically shaped annular graphite ring supported by inner and outer electrically conductive races. While one race is insulatively mounted on the rotating member and electrically connected to a condition sensor, the other race is insulatively mounted on the relatively stationary member and electrically connected to a signal detector, and the graphite ring is an electrical conductor interconnecting the sensor and detector via the two races. Alternatively, two opposing and contacting graphite rings are mounted in nonconducting carriers, one of the carriers keyed for rotation with the sensor while the other is mounted on the relatively stationary member.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: June 23, 1981
    Assignee: Goodyear Aerospace Corporation
    Inventors: William C. Alexander, Richard L. Kirk, Kenneth A. Thomsen