A 80 W broadband GaN HEMT envelope tracking PA harmonically tuned for WCDMA and LTE with 50% average efficiency

We discuss the development of a balanced GaN ET PA with optimised peak power and efficiency over 720 MHz to 960 MHz. The design was enabled by a wideband second harmonic control. The PA achieved performance delivers greater than 60% average efficiency across band at 80 W average power supporting multi-standard operation with both 2 channel WCDMA and 10 MHz LTE signals. The overall system efficiency including the ET modulator is 50% or greater with a target −50 dBc ACR across the entire bandwidth.