The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 27, 1990
Filed:
Dec. 02, 1988
Patrick Coquerel, Houilles, FR;
Institut Francais du Petrole, Rueil Malmaison, FR;
Abstract
A device is provided for locking the frequency and phase of a signal to that of a signal imposed, of the phase locked type. It comprises a modulator mixing a signal whose frequency is proportional to that of a reference signal coming from an oscillator. The low frequency component of the combined signal (isolated by an integrator) is permanently applied to the oscillator to an input with relatively low sensitivity, for the fine corrections, and to a high speed loop comprising a storage element and an amplifier, through a switch controlled by a window comparator. The high speed loop is connected to a higher sensitivity input. The high speed loop only acts during the setting period, for bringing the control voltage of the oscillator back to close to the optimum voltage, the optimization being provided by the permanent loop.