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. 17, 2005
Filed:
Oct. 30, 2002
Benedykt Mika, Albuquerque, NM (US);
Alma Stephanson Anderson, Rio Rancho, NM (US);
Benedykt Mika, Albuquerque, NM (US);
Alma Stephanson Anderson, Rio Rancho, NM (US);
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A dual signal path provides enhanced noise cancellation for phase locked loop applications. According to various aspects of the invention, dual charge pumps are used to split the phase locked loop signal into dual signal paths, wherein each path carries an information signal with an injected noise component. The dual signal paths are arranged to maintain the magnitude and phase characteristics of the injected noise component. Filter blocks process the signals, retaining the injected noise component. The filtered signals are coupled to the input of an adder circuit where the filtered signals are subtracted. Because each filtered signal contains the injected noise component, the subtraction operation effectively cancels the injected noise component from the filtered signals.