A method for power controller using CMOS class-E power amplifiers

A power controller was developed to provide inexpensive efficient transceivers for variable distances in mobile wireless communication products.The controller combines parallel amplification and drain modulation of the CMOS class-E power amplifier to provide high efficiency over a broad range of output powers.Drain modulation is implemented by a class-S amplifier.The power control is achieved using quarter-wavelength transmission lines.Simulations show that the amplifier achieves a maximum power-added efficiency of 47.9% with an average PAE greater than 41% over the output power's range of 140-700 mW.