Two-stage integrated doherty power amplifier with extended instantaneous bandwidth for 4/5g wireless systems

A highly linear fully integrated 40 W 2-stage Doherty power amplifier (DPA) for 4/5G communication systems is introduced. By using the digital pre-distortion (DPD) technique, the proposed DPA achieved −58 dBc ACLR with 42% total lineup efficiency at 39 dBm average output power with a 365 MHz IBW at a center frequency of 2 GHz. To extend instantaneous bandwidth (IBW), the proposed power amplifier (PA) is employed with linearity enhancement circuitry to minimize low frequency second-order term. To the best of the authors' knowledge, this is the first 2-stage RFIC DPA which can be linearized to this level with 365 MHz signal bandwidth and achieve this level of efficiency.