Multiband mobile communication apparatus

Abstract

Disclosed is a communication apparatus having a small-scale circuit used for modulation. A common transmission image rejection mixer ( 56 ) supplies transmission modulation frequencies to a plurality of quadrature modulators ( 23 ) (G, D, P, W). Accordingly, it is unnecessary to prepare the transmission image rejection mixer ( 56 ) for transmission signal types, makes it possible to prevent the circuit scale from increasing.

1 .- 2 . (canceled) 
   
   
       3 . A communication apparatus comprising:
 a fixed local oscillation means for generating a fixed frequency signal having a specified frequency;   a transmission modulation means for modulating a transmission signal based on a frequency of the fixed frequency signal;   a third local oscillation means for generating a third signal having a frequency within a specified range; and   a transmission signal output means which changes a frequency output from the transmission modulation means to a sum or a difference between a frequency of the third signal and a frequency output from the transmission modulation means and outputs the frequency in accordance with a type of the transmission signals   wherein the specified frequency range of the third signal is based on the type of transmission signal, said type of transmission signal being one of GSM (Global System for Mobile Communications), DCS (Digital Cellular System) PCS (Personal Communications Service), and UMTS (Universal Mobile Telecommunications System).   
   
   
       4 . (canceled)