| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image suppression mixer which can selectively receive a desired wave signal of a frequency higher or lower than a local frequency and achieves requests, such as interference wave resistance, low power consumption and miniaturization. <P>SOLUTION: The image suppression mixer 11 is provided with a mixer 5 provided with a first path and a second path to multiply an RF signal by a local signal LOI, a mixer 6 for multiplying the RF signal by a local signal LOQ, and an RFSEL (output circuit) 7 for outputting an IF signal IFI output from the mixer 5 to the first path (the second path) and outputting an IF signal IFQ output from the mixer 6 to the second path (the first path), wherein phase shifters 8 and 9 perform phase shifting so that the IF signal IFI and the IF signal IFQ may have a phase difference of 90°, and an adder 10 adds the IF signals IFI and IFQ respectively subjected to phase shifting. <P>COPYRIGHT: (C)2008,JPO&INPIT |
