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. 10, 2012
Filed:
Feb. 07, 2008
Wolfgang Wendler, Groebenzell, DE;
Alexander Roth, Dorfen, DE;
Hagen Eckert, Mering, DE;
Rohde & Schwarz GmbH & Co. KG, München, DE;
Abstract
A method and a device for measuring the phase noise of a signal registers the measurement signal (V) with a given measurement frequency (f) and with a superimposed phase noise (f(t)), divides the measurement signal (V) into a first and second measurement signal (V', V′), derives a first signal (V) with a first frequency ((f+f(t))/N) reduced relative to the measurement frequency (f) and the superimposed phase noise (f(t)) and a second signal (V) with a second frequency ((f+f(t))/M) reduced relative to the measurement frequency (f) and the superimposed phase noise (f(t)), determines a third signal (V) with a third frequency (f(t)) compensated by the measurement frequency (f) relative to the first frequency ((f+f(t))/N) of the first signal (V) and a fourth signal (V) with a fourth frequency (f(t)) compensated by the measurement frequency (f) relative to the second frequency ((f+f(t))/M) of the second signal (V) and determines a correlation spectrum from the third and fourth signal (V, V). The frequencies of the third and fourth signal (V, V) come to be disposed in each case within the frequency range of the correlation spectrum as a result of the frequency division of the frequency (f+f(t)) of the first and second measurement signal (V′, V′).