In this paper, novel RF front-ends for
GSM/W-CDMA dual band and dual mode
mobile terminal are described. The zero IF
direct modulation transmitter and
duel-superheterodyne receiver have been
realized in the RF module development. The
power down functions of IC chip used to switch
the RF module turn on W-CDMA mode or
GSM. The testing results are shown both for the
W-CDMA and GSM modes finally.