Patents by Inventor Mark J. Chambers

Mark J. Chambers 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).

  • DC level shifting circuit for analog circuits
    Patent number: 5459427
    Abstract: A DC translation circuit (200) provides maximum dynamic range in DC level shifting that is temperature and process invariant. The DC translation circuit (200) includes a bandgap reference (202) and current mirror circuit (204) for providing a reference current, Iref. An op-amp circuit (210) receives an AC signal centered about a first DC level, and translates the first DC level into a second DC level using the reference current, a current mirror circuit (208), op-amp circuit (210) and resistor (R2).
    Type: Grant
    Filed: May 6, 1994
    Date of Patent: October 17, 1995
    Assignee: Motorola, Inc.
    Inventors: Mark J. Chambers, Fatima D. Da Costa Seidel, Jesus P. Finol, James B. Phillips
  • Continuous time common mode feedback amplifier
    Patent number: 5381114
    Abstract: A continuous time common mode feedback amplifier CTCMFB (300) is suitable for applications requiring fully differential amplifiers in low voltage supply requirements. Two mirror image, low gain CMOS amplifiers (MP0/MP2 and MP3/MP4) in the CTCMFB (300) define and stabilize the common mode output voltage, Vcm, of the main differential amplifier (102). The transient response of the common mode amplifier (300) can be adjusted independently of the transient response of the main differential amplifier (102), allowing fast transient response to the main differential amplifier.
    Type: Grant
    Filed: April 4, 1994
    Date of Patent: January 10, 1995
    Assignee: Motorola, Inc.
    Inventors: Jesus S. Pena-Finol, Mark J. Chambers, James B. Phillips