Patents by Inventor Bernd Ripka

Bernd Ripka 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).

  • Patent number: 4955039
    Abstract: A quadrature receiver is disclosed which contains two mixers (M1, M3) in an in-phase receiving path and two mixers (M2, M4) in a quadrature receiving path for converting a received signal to a low IF. Each of the mixers is fed with an oscillator signal (O1 through O4), with the oscillator signal fed to one mixer of the respective receiving path having alternately the same or opposite phase from that of the oscillator signal fed to the other mixer of the same receiving path. In each receiving path, the mixers are followed by a circuit (P', P") which delivers an in-phase signal and a quadrature signal, respectively. These circuits compensate for the DC offset caused by the mixers.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: September 4, 1990
    Assignee: Alcatel N.V.
    Inventors: Dietrich Rother, Bernd Ripka, Rainer Berger