| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize frequency conversion using a mixer from a high frequency signal to a low frequency signal by using a lower frequency signal. <P>SOLUTION: In a frequency conversion circuit 30A, a signal F1 including a frequency "f1=a×f<SB POS="POST">LO</SB>+f<SB POS="POST">OUT</SB>" is extracted by a BPF 33-1, and a signal F2 including a frequency "f2=n×a×f<SB POS="POST">LO</SB>+f<SB POS="POST">OUT</SB>" is extracted by a BPF 33-2 from a composite signal Mix between an RF signal and a local oscillation signal Lo output by a mixer 31. Subsequently, a peak value of a summed signal ADD between the signals F1 and F2 by an adder 35 is sampled by a sample-and-hold circuit 36, and a signal of a conversion destination frequency f<SB POS="POST">OUT</SB>is output. <P>COPYRIGHT: (C)2012,JPO&INPIT |
