Patents by Inventor Derek Truesdale

Derek Truesdale 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).

  • System and method for measuring passive intermodulation (PIM) in a device under test (DUT)
    Patent number: 9455792
    Abstract: In an embodiment, a method for calculating PIM associated with a DUT comprises obtaining a first measurement of PIM with the DUT connected to the measuring instrument, introducing a shift in a phase offset of PIM produced at the DUT in response to test signals generated by the measuring instrument, obtaining, upon introducing the shift, a second measurement of PIM with the DUT connected to the measuring instrument and calculating the PIM associated with the DUT based on the first measurement and the second measurement.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: September 27, 2016
    Assignee: ANRITSU COMPANY
    Inventors: Derek Truesdale, Wesley Whiteley
  • Method and apparatus to estimate wireless base station signal quality over the air
    Patent number: 8169993
    Abstract: The quality of the signal from a base station is measured and adjusted for distortion due to multipath and due to signals from neighboring co-channel base stations. The signal quality is measured conventionally by determining Rho or EVM and then Rho or EVM are adjusted.
    Type: Grant
    Filed: April 16, 2008
    Date of Patent: May 1, 2012
    Assignee: Anritsu Company
    Inventors: Kee-dyi Huang, Maximilian Maung, Bernard Justus Olshausen, Jeffrey Abramson Heath, Derek Truesdale
  • METHOD AND APPARATUS TO ESTIMATE WIRELESS BASE STATION SIGNAL QUALITY OVER THE AIR
    Publication number: 20090264080
    Abstract: The quality of the signal from a base station is measured and adjusted for distortion due to multipath and due to signals from neighboring co-channel base stations. The signal quality is measured conventionally by determining Rho or EVM and then Rho or EVM are adjusted.
    Type: Application
    Filed: April 16, 2008
    Publication date: October 22, 2009
    Applicant: ANRITSU COMPANY
    Inventors: Kee-dyi Huang, Maximilian Maung, Bernie (Bernard Justus) Olshausen, Jeffrey Abramson Heath, Derek Truesdale
  • Very fast swept spectrum analyzer
    Patent number: 6700366
    Abstract: Analyzing a swept spectrum signal formed by mixing a ramping local oscillator and an input signal to generate an IF signal, the resulting IF signal having a phase change with respect to the input signal, the phase change including a quadratic portion. For analysis, the IF signal is processed such that the quadratic component of the phase change is removed. The quadratic component of the phase change is removed with a complex filter.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: March 2, 2004
    Assignee: Anritsu Company
    Inventor: Derek Truesdale
  • Very fast swept spectrum analyzer
    Publication number: 20030146743
    Abstract: Analyzing a swept spectrum signal formed by mixing a ramping local oscillator and an input signal to generate an IF signal, the resulting IF signal having a phase change with respect to the input signal, the phase change including a quadratic portion. For analysis, the IF signal is processed such that the quadratic component of the phase change is removed. The quadratic component of the phase change is removed with a complex filter.
    Type: Application
    Filed: February 5, 2002
    Publication date: August 7, 2003
    Inventor: Derek Truesdale