CMOS Linear High Performance Push Amplifier for WiMAX Power Amplifier

In this work a novel and efficient approach is used to optimize linearity and efficiency of power amplifier used in mobile WiMAX application. A linear and high performance push amplifier is designed and implemented in 0.18 μm CMOS technology to enhance linearity of class E switched mode power amplifier. Proposed push amplifier has two section; analog and switching section. Analog section provides required linearity and switching section guarantees satisfying total efficiency level. Each block is designed to meet required specifications. The core power amplifier which is a class E switched mode power amplifier is also designed to have maximum possible efficiency. The implemented circuit is simulated using HSPICERF with TSMC RF models for active and passive elements. The proposed power amplifier provides a maximum output power of 25 dBm and power added efficiency (PAE) as high as 48% at 2.5 GHz operation frequency. At 1-dB compression point this PA exhibits 23 dBm of output power with 46% PAE.