| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a frequency synthesizer and a corresponding frequency synthesizing method providing a large bandwidth, fine frequency resolution and low phase noise. <P>SOLUTION: The frequency synthesizer includes: a reference signal source 22 that provides a first reference signal; a frequency signal generation unit 24 that generates a synthesized frequency output signal at a predetermined frequency; a mixing unit 26 that mixes the synthesized frequency output signal with a frequency tuning signal and outputs a mixer signal 46; and a frequency tuning unit 28 that provides the frequency tuning signal. The frequency tuning unit 28 includes a first frequency tuning sub-unit and a second frequency tuning sub-unit which alternately provide the frequency tuning signal, and a frequency selection unit 30 that selects a desired frequency range from the mixer signal and outputs a frequency synthesizer output signal. <P>COPYRIGHT: (C)2012,JPO&INPIT |
