Patents by Inventor Mark A. Asher

Mark A. Asher 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).

  • Bit depth reduction for analog to digital conversion in global positioning system
    Patent number: 7315277
    Abstract: Disclosed is a system and method for reducing a bit-depth requirement for an A/D converter in a GPS receiver having an antenna for receiving an analog input signal and a low noise amplifier for amplifying the input signal, comprising a filter for filtering about a bandwidth B the amplified signal; a down-conversion module centering the frequency of the filtered signal about a center frequency f0; an automatic gain controller (AGC) for setting a set point of the input signal; an adder for adding noise to the gain controlled signal, said noise based upon the bandwidth B and center frequency f0; and an analog to digital (A/D) converter for converting the added noise signal to a digital signal, wherein the noise added to the gain controlled signal reduces the bit depth requirement of the A/D converter.
    Type: Grant
    Filed: April 29, 2003
    Date of Patent: January 1, 2008
    Assignee: The Johns Hopkins University
    Inventors: Robert L. Henderson, Mark A. Asher