A High Dynamic Range CMOS RF Power Amplifier with a Switchable Transformer for Polar Transmitters

A fully integrated CMOS RF power amplifier for a 1.8 GHz band EDGE polar transmitter is presented. It is implemented with 0.18-mum CMOS process. The output power is 33.4 ~ 33.5 dBm and the power added efficiency is 39 ~ 41 percent when the frequency varies from 1.71 to 1.91 GHz. The dynamic range is increased by 12 dB with the use of the proposed switchable transformer, which meets the EDGE dynamic range requirement of 37 dB when the supply voltage changes from 0.8 to 3.3 V.