Patent ID: 7702359

Claim:
A transceiver integrated circuit chip comprising: a plurality of interconnected different transceiver circuits capable of processing GSM, W-CDMA, and GSM-1800 signals respectively and formed monolithically on the transceiver integrated circuit chip; a switch capable of switching between GSM, W-CDMA, and GSM-1800 transceiver operation depending upon the type of signal transmitted or received; and an orthogonal modulator, wherein said orthogonal modulator comprises: a divider; a plurality of mixers; a common load to said plurality of mixers; and a plurality of variable attenuators, wherein each of the plurality of mixers has two input ports to which outputs of said divider and said variable attenuators are connected respective; and wherein, if an input signal level of said orthogonal modulator within the transceiver integrated circuit chip becomes lower by adjusting gain of said variable attenuators, each bias current of said plurality of mixers becomes lower to reduce the amount of occurrence of carrier leak, and to prevent carrier leak ratio from being deteriorated.