A 2.5-GHz band low voltage high efficiency CMOS power amplifier IC using parallel switching transistor for short range wireless applications

This paper presents a fully integrated low-voltage CMOS power amplifier (PA) IC for 2.5-GHz band short range wireless applications. The amplifier IC is designed, fabricated and fully evaluated in 180-nm CMOS technology. To realize high efficiency performance, the parallel switching transistor is proposed and combined with third harmonic tuning technique. In addition, for low voltage operations, the positive body bias is injected to the main switching transistor. The proposed CMOS PA IC has exhibited a P1dB of 8.0 dBm, a saturated output power of 10.1 dBm and a peak PAE of 34.5 % at a supply voltage of 1.0 V.