Patents by Inventor Richard W. Randlett

Richard W. Randlett 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).

  • Gray code current mode analog-to-digital converter
    Patent number: 7911366
    Abstract: One embodiment of the present invention is a Gray code current-mode analog to digital (ADC) converter using a Gray code current-mode ADC building block. The Gray code current-mode ADC building block can produce a Gray code bit and a current output that is sent to a next Gray code ADC building block. In one embodiment, the Gray code current-mode ADC building block does not use a voltage comparator in a signal path of the current output. In one embodiment, an 8 bit analog-to-digital converter can have a 65 ns conversion time and consume only 10 mW of power with a single +5.0V supply.
    Type: Grant
    Filed: September 17, 2008
    Date of Patent: March 22, 2011
    Assignee: Exar Corporation
    Inventors: Richard W. Randlett, Zonggi Hu
  • Combination offset voltage and bias current auto-zero circuit
    Patent number: 7760015
    Abstract: A circuit with an input acquisition loop and an output acquisition loop is used to compensate for the input offset voltage and bias current errors of an operational amplifier.
    Type: Grant
    Filed: May 28, 2008
    Date of Patent: July 20, 2010
    Assignee: Exar Corporation
    Inventor: Richard W. Randlett
  • GRAY CODE CURRENT MODE ANALOG-TO-DIGITAL CONVERTER
    Publication number: 20100066579
    Abstract: One embodiment of the present invention is a Gray code current-mode analog to digital (ADC) converter using a Gray code current-mode ADC building block. The Gray code current-mode ADC building block can produce a Gray code bit and a current output that is sent to a next Gray code ADC building block. In one embodiment, the Gray code current-mode ADC building block does not use a voltage comparator in a signal path of the current output. In one embodiment, an 8 bit analog-to-digital converter can have a 65 ns conversion time and consume only 10 mW of power with a single +5.0V supply.
    Type: Application
    Filed: September 17, 2008
    Publication date: March 18, 2010
    Applicant: EXAR CORPORATION
    Inventor: Richard W. Randlett
  • COMBINATION OFFSET VOLTAGE AND BIAS CURRENT AUTO-ZERO CIRCUIT
    Publication number: 20090231029
    Abstract: A circuit with an input acquisition loop and an output acquisition loop is used to compensate for the input offset voltage and bias current errors of an operational amplifier.
    Type: Application
    Filed: May 28, 2008
    Publication date: September 17, 2009
    Applicant: EXAR CORPORATION
    Inventor: Richard W. Randlett
  • Elimination of dummy detector on optical detectors using input common mode feedback
    Patent number: 7411460
    Abstract: A voltage reference forces a constant voltage at the inputs to an amplifier, thereby negating a need for a dummy detector on the non-active input of the amplifier.
    Type: Grant
    Filed: March 10, 2006
    Date of Patent: August 12, 2008
    Assignee: Exar Corporation
    Inventor: Richard W. Randlett