| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain a broadband for the frequency of a local oscillation signal outputted from a local oscillation circuit (to extend a frequency variable range) in a wireless apparatus having a VCO circuit and a PLL circuit without increasing the circuit scale by not providing a plurality of VCO circuits. <P>SOLUTION: The wireless apparatus is provided with loop filters having a plurality of characteristics and a changeover device and an optimum loop filter can be selected in response to the frequency of the local oscillation signal to attain a broadband. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
