Georgia Tech inventors have developed a broadband mm-wave mixed signal Doherty TX, with linearity and energy efficiency to support multiple bands for 5G MIMO systems. The Doherty output network with offset lines extends the Doherty power amplifier carrier frequency range and reduce the passive loss at deep PBO. Built-in 360° mm-wave phase-rotators reconfigures static main/auxiliary phase-offset for further frequency extension. The Doherty power amplifier (PA) employs mixed-signal power cells. While the main PA contains an analog PA and digital binary PA cells, the auxiliary PA contains digital binary PA cells. As a result, there is an optimum TX efficiency. Driven by complex modulated signals, the PA signal bandwidth is largely reduced to ease GHz modulation. The multi-path Doherty PA reconfiguration leads to enhancing TX efficiency up-to 12 dB PBO.The system also uses a computation-assisted dynamic AM-PM feedforward cancellation by mm-wave phase rotators to support GHz modulation. Lastly, the mixed-signal Doherty PA also compensates in-field performance variations, including antenna VSWR.