Patents by Inventor Chris W. Angell

Chris W. Angell 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).

  • Multi-impedance input stage
    Patent number: 6366162
    Abstract: An input buffer circuit is operable to selectively present either low or high input impedance while maintaining uniform output impedance. The buffer is characterized by first and second amplifier circuits connected in parallel between an input to and an output from the buffer. The amplifiers are individually controlled between enabled and disabled states. When enabled, the first amplifier has low input impedance and predetermined output impedance and the second amplifier has high input impedance and the predetermined output impedance, and when disabled each amplifier has high input and output impedance. To operate the buffer to have low input impedance, the first amplifier is enabled while the second amplifier is disabled. To operate the buffer to have high input impedance, the second amplifier is enabled while the first amplifier is disabled.
    Type: Grant
    Filed: January 2, 2001
    Date of Patent: April 2, 2002
    Assignee: Ericsson Inc.
    Inventors: Chris W. Angell, Erik L. Bengtsson, Scott R. Justice, Aristotele Hadjichristos