Broadband Doherty Power Amplifier With Transferable Continuous Mode
In this paper, in band continuous mode transferring (CMT) method is presented for designing broadband Doherty power amplifier (DPA) Specifically, transferable continuous mode, transferring between class J continuum to class F 1 continuum, is introduced into DPA at output back off (OBO) power level for improving bandwidth and efficiency. For validation, a broadband DPA with operation mode transferring from continuous class J to continuous class F 1 is designed, fabricated and measured. Experimental results show the drain efficiencies (DEs) of the fabricated DPA are 46.3% 57.7% and 58.4% 69.1% at 6 dB OBO and peaking power levels over 1.7 2.6 GHz. The saturation power of this DPA is 43.1 45.2 dBm with a gain of 9.1 11.2 dB in the interested band. Furthermore, when the fabricated DPA is stimulated by a 20 MHz wideband signal with a peak to average power ratio (PAPR) of 7.05 dB at 2.4 GHz, the measured average power is 36.5 dBm with an average DE of 45.7% and the measured adjacent channel leakage ratios (ACLRs) are 31.9 dBc and 50.4 dBc before and after DPD technique, respectively.
IEEE Access