Patents by Inventor Jeffrey L. Powell

Jeffrey L. Powell 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).

  • Trimming of operational amplifier gain
    Patent number: 5034699
    Abstract: A method of adjusting the gain of an operational amplifier using a digital-to-analog converter (DAC) based upon R-2R resistive ladder technology inserts the DAC between the output of the operational amplifier and the non-inverting input to form a positive feedback loop. Variations of a digital control code applied to the DAC to control the gain are not affected by corresponding variations in the output resistance of the DAC so that undesirable changes in the magnitude of output noise, drift, bandwidth and offset voltage are minimized.
    Type: Grant
    Filed: November 14, 1990
    Date of Patent: July 23, 1991
    Assignee: Tektronix, Inc.
    Inventor: Jeffrey L. Powell