Invention Grant
US07929929B2 Method and apparatus for spur reduction in a frequency synthesizer
有权
用于频率合成器中的支线减少的方法和装置
- Patent Title: Method and apparatus for spur reduction in a frequency synthesizer
- Patent Title (中): 用于频率合成器中的支线减少的方法和装置
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Application No.: US11860636Application Date: 2007-09-25
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Publication No.: US07929929B2Publication Date: 2011-04-19
- Inventor: Paul H. Gailus , John J. Bozeki , Joseph A. Charaska , Vadim Dubov , Manuel P. Gabato, Jr. , Armando J Gonzalez
- Applicant: Paul H. Gailus , John J. Bozeki , Joseph A. Charaska , Vadim Dubov , Manuel P. Gabato, Jr. , Armando J Gonzalez
- Applicant Address: US IL Schaumburg
- Assignee: Motorola Solutions, Inc.
- Current Assignee: Motorola Solutions, Inc.
- Current Assignee Address: US IL Schaumburg
- Agent Valerie M. Davis
- Main IPC: H04B1/18
- IPC: H04B1/18

Abstract:
A frequency synthesizer includes: a frequency source generating a reference signal that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that includes, a phase detector circuit, a loop filter, a controlled oscillator that generates an output signal at an output, and a loop divide circuit; a non-linear circuit element at an input of the phase detector circuit, which generates intermodulation distortion that causes at least one spurious signal at the output; and a controller controlling the loop divide circuit and the non-linear circuit element. The frequency synthesizer further includes a dither circuit that adjusts the timing of some of the pulses of the reference signal based on a parameter provided by the controller to the non-linear circuit element, thereby, providing a jittered reference signal to the non-linear circuit element for attenuating the at least one spurious signal at the output.
Public/Granted literature
- US20090081984A1 METHOD AND APPARATUS FOR SPUR REDUCTION IN A FREQUENCY SYNTHESIZER Public/Granted day:2009-03-26
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