Patents by Inventor Christopher James Wrigley

Christopher James Wrigley 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).

  • Mixed linear/square-root encoded single slope ramp provides a fast, low noise analog to digital converter with very high linearity for focal plane arrays
    Patent number: 8624769
    Abstract: An analog-to-digital converter (ADC) converts pixel voltages from a CMOS image into a digital output. A voltage ramp generator generates a voltage ramp that has a linear first portion and a non-linear second portion. A digital output generator generates a digital output based on the voltage ramp, the pixel voltages, and comparator output from an array of comparators that compare the voltage ramp to the pixel voltages. A return lookup table linearizes the digital output values.
    Type: Grant
    Filed: August 10, 2012
    Date of Patent: January 7, 2014
    Assignee: California Institute of Technology
    Inventors: Christopher James Wrigley, Bruce R. Hancock, Kenneth W. Newton, Thomas J. Cunningham
  • MIXED LINEAR/SQUARE-ROOT ENCODED SINGLE SLOPE RAMP PROVIDES A FAST, LOW NOISE ANALOG TO DIGITAL CONVERTER WITH VERY HIGH LINEARITY FOR FOCAL PLANE ARRAYS
    Publication number: 20130038482
    Abstract: An analog-to-digital converter (ADC) converts pixel voltages from a CMOS image into a digital output. A voltage ramp generator generates a voltage ramp that has a linear first portion and a non-linear second portion. A digital output generator generates a digital output based on the voltage ramp, the pixel voltages, and comparator output from an array of comparators that compare the voltage ramp to the pixel voltages. A return lookup table linearizes the digital output values.
    Type: Application
    Filed: August 10, 2012
    Publication date: February 14, 2013
    Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Christopher James Wrigley, Bruce R. Hancock, Kenneth W. Newton, Thomas J. Cunningham