RADIO COMMUNICATION EQUIPMENT AND PORTABLE TELEPHONE TERMINAL

摘要

PROBLEM TO BE SOLVED: To realize radio communication using a plurality of different frequency bands while suppressing the large size of a device and an increase in cost and to realize radio communication that simultaneously uses a plurality of frequencies. SOLUTION: A voltage controlled oscillator 33 generates a local signal LO1 of a frequency f1 to be used for radio telephone communication. An RF device 30 is used for another function different from the radio telephone communication. A mixer 32 generates a local signal LO2 of a frequency (f1 + fa or f1 - fa) by mixing a local signal LOa of a frequency fa generated by a voltage controlled oscillator 31 of the RF device 30 with the local signal LO1 from the voltage controlled oscillator 33. Changeover switches 42 and 43 selectively supplies one between the local signals LO1 and LO2 to a mixer 13 of one receiving system between two receiving systems. The local signal LO1 is supplied to an mixer of the other receiving system. COPYRIGHT: (C)2006,JPO&NCIPI