A fully integrated 2.4 GHz class-E amplifier has been implemented by 0.18 mum CMOS technologies. By using the switching operating mode of a class-E amplifier, the dc power dissipation can be reduced. The amplifier delivers 17.3 dBm output power at 2.4 GHz, with a maximum power-added efficiency (PAE) of 63%, from a 2-V supply voltage. To ensure a stable performance of the device and circuit, the 0.18 mum MOSFET and the class-E amplifier also biased at high voltage stress for 150 h continuous testing. This monolithic amplifier includes the matching and biasing circuit, requiring no external components. (C) 2003 Elsevier Ltd. All rights reserved.