FREQUENCY SYNTHESIZER, CONTROL METHOD OF FREQUENCY SYNTHESIZER, MULTI-BAND TELECOMMUNICATION DEVICE

摘要: PROBLEM TO BE SOLVED: To provide a frequency synthesizer producing various local oscillation signals suppressed in sprious. SOLUTION: In the 10A where outputs of plurality oscillators 11, 12 are converted into having different phases through phase shifters 21, 22 for multiplication mixers 31, 32 and, further, subjected to addion by an adder 40 output 41, signal taken out via sampling switch 61, is multiplied obtained from multiplier 64 down conversion and sprious objective extracted bandpass filter 62, then, strength 63-1 detected detecting unit 63 while gain G mixer 31 controlled amplitude error control 60 based on suppress included 41 minimum value thereof. COPYRIGHT: (C)2009,JPO&INPIT