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:
Aug. 10, 1982
Filed:
Oct. 24, 1979
Tapan K Das, Swindon, GB;
Martin A Fryer, Swindon, GB;
Plessey Handel und Investments AG, Zug, CH;
Abstract
A phase-locked loop frequency synthesizer with fine tuning comprises a controlled oscillator, a divider for dividing signals provided by the oscillator, a comparator for comparing signals derived from the divider with a reference signal and for providing a control signal for the controlled oscillator, a fine tuning circuit for providing a fine tuning control signal, and a pulse generator responsive to the fine tuning control signals for providing one or more control pulses to control the divider. The divider preferably comprises a two modulus divider for dividing by one of two factors for a period dependent upon the number of control pulses provided by the pulse generator, and for dividing by the other of the two factors for the remainder of the time period. The pulse generator preferably comprises a pulse detection and synchronization circuit and a control pulse generator, each connected to the output of the two modulus divider.