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. 24, 2017
Filed:
Mar. 30, 2016
Industrial Technology Research Institute, Hsinchu, TW;
Wei-Zen Chen, Hsinchu, TW;
Hsin-Pei Lee, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A frequency synthesizer and a method for frequency synthesis are provided. The frequency synthesizer includes a subband phase-locked loop (PLL) and a main PLL. A divisor of an adjustable non-integer frequency divider in the subband PLL is adjusted, and a channel frequency of a maximum frequency band of all frequency bands is output. A divisor of an adjustable integer frequency divider in the main PLL is adjusted, and a center frequency required for each frequency band of the all frequency bands is output. The center frequency and the channel frequency are mixed by a mixer to produce a band frequency. A quantization noise generated by the adjustable non-integer frequency divider is filtered out by the subband PLL to reduce the impact of the quantization noise on the main PLL.