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. 13, 2003
Filed:
Oct. 24, 2001
Gerald R. Fischer, Playa Del Rey, CA (US);
Northrop Grumman Corporation, Redondo Beach, CA (US);
Abstract
A phase locked loop ( ) for generating an output frequency signal. The phase locked loop ( ) includes a controlled oscillator ( ) to generate the output frequency signal in response to a tune signal. A phase detector ( ) generates an error signal representing a difference between a reference frequency signal and the output frequency signal. A loop filter ( ) having a filter characteristic, filters the error signal and generates the tune signal. The loop filter ( ) includes a bandwidth switching circuit ( ) to vary the filter characteristics. A charge cancellation circuit ( ) is coupled to the loop filter ( ). In response to the error signal, the charge cancellation circuit ( ) cancels errors associated with the bandwidth switching circuit.