Patents by Inventor Christian Grewing

Christian Grewing 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).

  • Publication number: 20050046488
    Abstract: A PLL circuit is tuned to a first frequency by using a first digital modulation signal and subsequently tuned to a second frequency by using a second digital modulation signal. A differential signal, that is a function of the change in voltage of a VCO control signal generated by the modulation signals, is compared with a comparison signal, that is characteristic of the analog modulation amplitude. Based on the comparison the analog modulation amplitude is changed to minimize or substantially eliminate a deviation between the signals.
    Type: Application
    Filed: July 24, 2002
    Publication date: March 3, 2005
    Inventors: Christian Grewing, Markus Hammes, Andre Hanke, Giuseppe Puma
  • Publication number: 20040192231
    Abstract: A two-point modulator includes a PLL circuit and a simplified digital pre-filtering system. The two-point modulator includes a first circuit path for impressing an analog modulation signal into a first point in the PLL circuit, and a second circuit path for impressing a digital modulation signal into a second point in the PLL circuit. The second circuit path actuates a frequency divider in the feedback path in the PLL circuit and contains a digital filter which has a square-wave pulse response.
    Type: Application
    Filed: May 27, 2004
    Publication date: September 30, 2004
    Inventors: Christian Grewing, Markus Hammes, Stefan Van Waasen
  • Publication number: 20040097206
    Abstract: A circuit configuration for the frequency conversion of an oscillator frequency into a carrier frequency includes a mixer, to which a signal with the oscillator frequency can be fed unchanged in its frequency at an input and can be fed divided-down in its frequency at a second input. The frequency division is, in this case, preferably a frequency division by four. The present circuit configuration has a particularly small area requirement, a particularly low current consumption, and is largely independent of fabrication tolerances. The present circuit configuration can be used with preference in mobile radio transceivers.
    Type: Application
    Filed: November 12, 2003
    Publication date: May 20, 2004
    Inventors: Christian Grewing, Andre Hanke, Stefan Van Waasen
  • Patent number: 6621364
    Abstract: A voltage-controlled oscillator for frequency modulation includes an oscillator core with a tunable resonant circuit component which is driven with a control voltage. Furthermore, a modulator component is provided which is driven with a modulation signal for frequency modulation. The modulator component is additionally coupled to the terminal for supplying the control voltage. As a result, a constant modulation deviation can be achieved over the entire tuning range even in the case of oscillators having a large tuning range. The oscillator circuit is particularly suitable for use in transmitting circuits for digital communication.
    Type: Grant
    Filed: January 3, 2002
    Date of Patent: September 16, 2003
    Assignee: Infineon Technologies AG
    Inventors: Christian Grewing, Klaus Getta, Udo Matter, Faramarz Rassouli
  • Publication number: 20020089387
    Abstract: A voltage-controlled oscillator for frequency modulation includes an oscillator core with a tunable resonant circuit component which is driven with a control voltage. Furthermore, a modulator component is provided which is driven with a modulation signal for frequency modulation. The modulator component is additionally coupled to the terminal for supplying the control voltage. As a result, a constant modulation deviation can be achieved over the entire tuning range even in the case of oscillators having a large tuning range. The oscillator circuit is particularly suitable for use in transmitting circuits for digital communication.
    Type: Application
    Filed: January 3, 2002
    Publication date: July 11, 2002
    Inventors: Christian Grewing, Klaus Getta, Udo Matter, Faramarz Rassouli