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. 27, 2003
Filed:
Oct. 24, 2001
Gerald R. Fischer, Playa Del Rey, CA (US);
Northrop Grumman Corporation, Los Angeles, CA (US);
Abstract
The present invention provides a phase locked loop ( ) for generating a variable output frequency signal. The phase locked loop ( ) includes a controlled oscillator ( ) to generate the variable output frequency signal in response to a tune signal. A feedback frequency divider ( ) coupled to the controlled oscillator ( ) is operable to generate a divided frequency signal from the variable output frequency signal. A phase detector ( ) generates an error signal representing a difference between a reference frequency signal and the divided frequency signal. A sample and hold circuit ( ) is activable in response to a gating signal ( ) derived from the reference frequency, to sample the error signal and generate a sampled signal. A loop filter ( ) filters the sampled signal and generates the tune signal.