A 6.15GHz balanced linear power amplifier with digital predistortion linearization

This paper presents the design of a balanced power amplifier at 6.15GHz for wireless communication systems in the higher frequency band. Two final stage amplifiers are connected in parallel through two branch line hybrid couplers, to obtain good input and output VSWR performance. The digital predistortion technique is used to further improve the linearity. The measured results show that the developed PA has excellent performance. S11 and S22 of the Balanced power amplifier are both less than -15dBc. The two-tone IMD3 is less than -47dBc at output power of 27dBm. Tested by 20MHz 64-QAM, ACPR arrives at 47.1dBc and EVM is 0.6%. The digital predistortion technique is used to further improve the linear performance of the power amplifier