| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain phase synchronization in a desired frequency regardless of whether an output frequency range of a voltage controlled oscillator is a narrow band or a wide band. <P>SOLUTION: A frequency mixing means is provided which mixes frequencies of a high frequency signal D<SB>o</SB>(t) and a local oscillation signal D<SB>p</SB>(t) and outputs a first low-frequency feedback signal D<SB>v1</SB>(t) and a second low-frequency feedback signal D<SB>v2</SB>(t) mutually having a phase difference of 90°, and phase comparators 9, 10 compares phases of the first and second low-frequency feedback signals D<SB>v1</SB>(t), D<SB>v2</SB>(t) with phases of first and second reference signals D<SB>r1</SB>(t), D<SB>r2</SB>(t) and output first and second phase comparison signals D<SB>e1</SB>(t), D<SB>e2</SB>(t) indicating a result of the phase comparison. <P>COPYRIGHT: (C)2008,JPO&INPIT |
