Patents by Inventor Leonid V. Evstratov

Leonid V. Evstratov 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: 7724095
    Abstract: A floating DC-offset circuit for a phase detector. The circuit may provide a floating DC-offset to the phase detector, or to the voltage-controlled oscillator of the phase-locked loop. The circuit includes a voltage comparator, clock, digital resistor, and offset line to a DC-offset branch of the phase detector. The voltage comparator detects when the voltage at the output of the loop filter of the phase-locked loop has gone outside of a designated range, and activates the clock when the voltage is outside the designated range. The clock emits impulses that are counted by the digital resistor. The digital resistor shifts DC-offset at the DC-offset branch of the phase detector. The new DC-offset level is maintained once the loop filter output voltage has returned within the designated range. In an alternate embodiment, the DC-offset branch is connected to rough-tuning input of a wide-tuned voltage-controlled oscillator.
    Type: Grant
    Filed: December 4, 2007
    Date of Patent: May 25, 2010
    Inventor: Leonid V. Evstratov
  • Publication number: 20080129355
    Abstract: A floating DC-offset circuit for a phase detector. The circuit may provide a floating DC-offset to the phase detector, or to the voltage-controlled oscillator of the phase-locked loop. The circuit includes a voltage comparator, a clock, a digital resistor, and an offset line to a DC-offset branch of the phase detector. The voltage comparator detects when the voltage at the output of the loop filter of the phase-locked loop has gone outside of a designated range, and activates the clock when the voltage is outside the designated range. The clock emits impulses that are counted by the digital resistor. The digital resistor shifts DC-offset at the DC-offset branch of the phase detector. The new DC-offset level is maintained once the voltage at the output of the loop filter has returned to within the designated range. In an alternate embodiment, the DC-offset branch is connected to rough-tuning input of a wide-tuned voltage-controlled oscillator.
    Type: Application
    Filed: December 4, 2007
    Publication date: June 5, 2008
    Inventor: Leonid V. Evstratov