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This paper describes a newly developed Si/GaAs hybrid multiband power amplifier module (MB-PAM) that supports major quad wideband code division multiple access (WCDMA) bands (Bands 5, 8, 2, and 1) for handset applications. With four dies (two GaAs-HBT dies, one GaAs-HEMT die, and one CMOS die) and several surface-mount devices, the hybrid MB-PAM accommodates two amplifier chains and two single-pole...
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