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:
Mar. 31, 2009
Filed:
Jul. 24, 2007
Peter G. Halverson, Temple City, CA (US);
Brent Ware, Pasadena, CA (US);
Daniel A. Shaddock, Kaleen, AU;
Robert E. Spero, La Crescenta, CA (US);
Peter G. Halverson, Temple City, CA (US);
Brent Ware, Pasadena, CA (US);
Daniel A. Shaddock, Kaleen, AU;
Robert E. Spero, La Crescenta, CA (US);
California Institute of Technology, Pasadena, CA (US);
Abstract
A phasemeter for estimating the phase of a signal. For multi-tone signals, multiple phase estimates may be provided. An embodiment includes components operating in the digital domain, where a sampled input signal is multiplied by cosine and sine terms to provide estimates of the inphase and quadrature components. The quadrature component provides an error signal that is provided to a feedback loop, the feedback loop providing a model phase that tends to track the phase of a tone in the input signal. The cosine and sine terms are generated from the model phase. The inphase and quadrature components are used to form a residual phase, which is added to the model phase to provide an estimate of the phase of the input signal. Other embodiments are described and claimed.