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:
Jan. 20, 2004
Filed:
Oct. 24, 2001
Gerald R. Fischer, Playa Del Ray, CA (US);
Talley J. Allen, Torrance, CA (US);
Ken K. Tsai, Palos Verdes Estates, CA (US);
Northrop Grumman Corporation, Redondo Beach, CA (US);
Abstract
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 phase detector ( ) is activable in response to a gating signal ( ) to generate an error signal representing a difference between a reference frequency signal and the variable output frequency signal. A loop filter ( ) having a filter characteristic, filters the error signal and generates the tune signal. An offset cancellation circuit ( ) is coupled to the loop filter ( ). In response to an error signal representing phase offset of the phase locked loop ( ), the offset cancellation circuit ( ) supplies a compensating signal to reduce the phase offset.