Patents Assigned to Oscilloquartz Sa
  • Parallel analog and digital control loops for phase locking precision oscillator to reference oscillator
    Patent number: 4107623
    Abstract: A control device for accurately maintaining the frequency of a quartz crystal oscillator. The control device includes reference oscillators and two control loops in parallel, a first digital control loop providing coarse adjustment of the quartz oscillator frequency and a second, analog control loop providing fine adjustment.
    Type: Grant
    Filed: June 14, 1977
    Date of Patent: August 15, 1978
    Assignee: Oscilloquartz Sa
    Inventors: Erhard Graf, Jean-Pierre Wiedmer