A fully integrated 3.5 GHz CMOS differential power amplifier driver

Abstract

A fully integrated CMOS differential power amplifier driver (PAD) is proposed for WiMAX applications. In order to fulfill the differential application requirements, a transmission line transformer is used as the output matching network. A differential inductance constitutes an inter-stage matching network. Meanwhile, an on chip balun realizes input matching as well as single-end to differential conversion. The PAD is fabricated in a 0.13 m RFCMOS process. The chip size is 1.1 1.1 mm 2 with all of the matching network integrated on chip. The saturated power is around 10 dBm and power gain is about 12 dB.