0.9/2.4 GHz Active Switch Concurrent Dual-Band Power Amplifier Design in 0.18 μmRF CMOS

In this paper, a dual band power amplifier with high output power in a standard 0.18 μm CMOS process for RFID reader is presented. The PA can work in concurrent dual-band mode at 0.9 GHz and 2.4 GHz. To achieve linearity and high output power simultaneously, Several AB-Class amplifiers are combined. The proposed power amplifier consists of preamplifier, main power amplifier, power combiner based on transformer type and the output matching circuit. Power stage structures are chosen differential and cascode because of the advantages of these topologies. Also, the output filters are realized by active switch technique to be able work in a concurrent dual - band. The power amplifier has a 1dB compression point of 30 dBm and the power gain of 33 dB and power-added efficiency (PAE) of 27% at 0.9 GHz operating frequency. Also, the power amplifier has a 1dB compression point of 28 dBm and the power gain of 28 dB and power-added efficiency (PAE) of 32.5% at 0.9 GHz operating frequency.