Patents by Inventor Sam E. Alexander

Sam E. 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).

  • Publication number: 20010010474
    Abstract: An improved master-slave flip-flop that is characterized by a novel clock generator. The improved flip-flop preserves the true master-slave relationship by ensuring a two step latching process is executed by non-overlapping clocks. The clock generator features an inverter in combination with a current limiter. The current limiter has the effect of shifting the trip point of the inverter such that non-overlapping clocks may be derived from a single master clock signal or a master clock signal and its complement.
    Type: Application
    Filed: March 19, 2001
    Publication date: August 2, 2001
    Inventor: Sam E. Alexander
  • Patent number: 6208500
    Abstract: An improved high quality factor capacitive device is implemented on a single, monolithic integrated circuit. The new layout techniques improve the quality factor (Q) of the capacitor by reducing intrinsic resistance of the capacitor by reducing the distance between the metal contacts of the top and bottom conductive plates. The layout techniques require laying out the top conductive plate of the capacitor in strips such that metal contacts from the bottom conductive plate pass in between the strips and through the dielectric layer. Alternatively, the apertures may be etched into the top conductive plate so that metal contacts pass through the apertures and connect to the bottom conductive plate.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: March 27, 2001
    Assignee: Microchip Technology Incorporated
    Inventors: Sam E. Alexander, Randy L. Yach, Roger St. Amand
  • Patent number: 6208191
    Abstract: An improved voltage clamp for operating with wireless communication input circuits over the RF band. The clamp provides for symmetrical clamping for excessive positive and negative input voltage excursions. The clamp does not exact a current penalty when operating in the non-excessive positive and negative input voltage regimes. The clamp is comprised of an input node, a capacitor, a MOS transistor, a diode and a ground potential node.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: March 27, 2001
    Assignee: Microchip Technology Incorporated
    Inventor: Sam E. Alexander
  • Patent number: 6204708
    Abstract: An improved master-slave flip-flop that is characterized by a novel clock generator. The improved flip-flop preserves the true master-slave relationship by ensuring a two step latching process is executed by non-overlapping clocks. The clock generator features an inverter in combination with a current limiter. The current limiter has the effect of shifting the trip point of the inverter such that non-overlapping clocks may be derived from a single master clock signal or a master clock signal and its complement.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: March 20, 2001
    Assignee: Microchip Technology Incorporated
    Inventor: Sam E. Alexander