Abstract: A high linearity power amplifier is designed for the wideband code division multiple access (WCDMA) signal which has the characteristic of high peak-average-power-ratio. The circuit is simulated and optimized by microwave CAD software. A hybrid circuits is designed by means of microstrip and parallel capacitors. Finally, the power amplifier module is implemented. The measurement shows that the amplifier has good performance:Pout=40 dBm, ACPR is 50.64 dB(@5 MHz)and 66.29 dB (@10 MHz), EVM=1.85%, and power ratio is 12%. The result is qualified to the requirement of the 3th generation partnership project (3GPP).