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:
May. 12, 1981
Filed:
Oct. 04, 1979
Craig W Brun, Honeoye Falls, NY (US);
Wilfred L Hand, Clarence, NY (US);
GTE Products Corporation, Stamford, CT (US);
Abstract
A delay circuit for enhancing acquisition of a synthesizer PLL subsequent to change in the synthesizer's frequency of operation or a change in the source of tuning voltage applied to a voltage-controllable reference oscillator. A control circuit determines whether the reference oscillator operates in a crystal-controlled or in a voltage-controlled mode. The delay circuit includes a monostable having an output coupled to the control circuit and a trigger input coupled to both an ENTER CHANNEL indicator and a pulse generator. The monostable is triggered, thereby assuring temporary crystal-controlled operation of the reference oscillator, in response to an ENTER CHANNEL indicator or to an output from a pulse generator. The pulse generator is responsive to a change in the source of reference oscillator tuning control voltage from, for example, a manually variable fine tuning potentiometer to an AFC control circuit.