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:
Sep. 24, 2019
Filed:
Jul. 12, 2017
Oracle International Corporation, Redwood Shores, CA (US);
Guanghua Shu, Belmont, CA (US);
Frankie Y. Liu, Palo Alto, CA (US);
Oracle International Corporation, Redwood Shores, CA (US);
Abstract
The disclosed embodiments relate to a system that controls a phase-locked loop (PLL), eliminating harmonic locking issues during subsampling operation and achieving better noise performance. During operation, the system performs a procedure to measure a first duty cycle that indicates a relationship between a reference signal, which has a frequency F, and a voltage-controlled oscillator (VCO) output signal, which has a frequency Fand is generated by a VCO. The system also performs the procedure to measure a second duty cycle that indicates a relationship between a second reference signal (with a frequency of c*F) and the VCO-output signal. Next, the system determines a frequency and phase relationship between the reference signal and the VCO-output signal based on the first and second duty cycles. Finally, the system uses the frequency and phase relationship to adjust the VCO so that the VCO-output signal, which is used as an output of the PLL, is frequency and phase aligned with the reference signal.