| 摘要 |
<p>A quadrature demodulator (408') and a quadrature modulator (908') convert a reception intermediate frequency signal (151) into reception baseband signals (157 and 158), and also convert transmission baseband signals (657 and 658) into a transmission intermediate frequency signal (651), respectively. While local oscillation signals having frequencies suitable for the respective bands are output from a commonly used local oscillator (111), such a local oscillation signal obtained by shifting a phase thereof pi /2 by a phase shifter (412) is supplied to one mixer of quadrature mixers (109 and 609), and such a signal obtained by inverting, or not inverting the plurality of the local oscillation signal by an exclusive OR gate circuit (413) in response to a band switching signal (153) is supplied to the other mixer of quadrature mixers (110 and 610). <IMAGE></p> |
