On-chip power-combining techniques for watt-level linear power amplifiers in 0.18 μm CMOS

Three linear CMOS power amplifiers(PAs) with high output power(more than watt-level output power)for high data-rate mobile applications are introduced. To realize watt-level output power, there are two 2.4 GHz PAs using an on-chip parallel combining transformer(PCT) and one 1.95 GHz PA using an on-chip series combining transformer(SCT) to combine output signals of multiple power stages. Furthermore, some linearization techniques including adaptive bias, diode linearizer, multi-gated transistors(MGTR) and the second harmonic control are applied in these PAs. Using the proposed power combiner, these three PAs are designed and fabricated in TSMC0.18 m RFCMOS process. According to the measurement results, the proposed two linear 2.4 GHz PAs achieve a gain of 33.2 d B and 34.3 d B, a maximum output power of 30.7 d Bm and 29.4 d Bm, with 29% and 31.3% of peak PAE, respectively. According to the simulation results, the presented linear 1.95 GHz PA achieves a gain of37.5 d B, a maximum output power of 34.3 d Bm with 36.3% of peak PAE.