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. 24, 2016
Filed:
Apr. 07, 2015
Adtran, Inc., Huntsville, AL (US);
Jason R. Ferguson, Mesa, AZ (US);
Adtran, Inc., Huntsville, AL (US);
Abstract
Phase-locked loop (PLL) circuits and methods of operation are disclosed. At frequencies that are closer to a center frequency, the phase noise characteristics contributed by a crystal oscillator in a first PLL sub-circuit dominate over the phase noise characteristics contributed by a second PLL sub-circuit, resulting in low close-in phase noise in the overall PLL circuit output signal, while at frequencies farther from the center frequency, the phase noise characteristics contributed by the second PLL sub-circuit dominate over the phase noise characteristics contributed by the crystal oscillator in the first PLL sub-circuit, resulting in low phase noise in the overall PLL circuit output signal at those frequencies.