Broadband Doherty Power Amplifier With Transferable Continuous Mode

Abstract

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. INDEX TERMS Broadband power amplifier, Doherty, in-band continuous mode transferring.

High efficiency wideband continuous class power amplifier design based on reflection coefficient circle impedance area optimization

“…To meet the requirements for wideband and high efficiency, continuous class mode PAs have garnered significant research attentions [12,13,14,15,16,17,18]. Although these designs can achieve high efficiency, the simplicity of the employed operating mode and the optimization targeting specific impedance values of limited feasible solution space, resulting in stringent optimization conditions and narrow bandwidth for the designed PAs [19,20,21,22].…”

An asymmetric Doherty amplifier with class‐J mode in GaAs HBT technology for n78 frequency band

“…To enhance the back‐off efficiency of the power amplifier, the Doherty structure was invented in 1936 and is widely used in the modern world 4 . The combination of continuous mode and Doherty structure can achieve better performance and is commonly implemented in PCB design 5,6 . However, it is rarely employed in compound semiconductor MMIC design.…”

“…4 The combination of continuous mode and Doherty structure can achieve better performance and is commonly implemented in PCB design. 5,6 However, it is rarely employed in compound semiconductor MMIC design. Among the compound semiconductor technologies, DPA MMIC fabricated by GaN could achieve unparalleled output power and efficiency performance, 7,8 but it has the disadvantages of high cost and slow compression.…”

A Broadband Doherty Power Amplifier With a New Load Modulation Network

“…Therefore, how to enhance the bandwidth of DPA so that DPA can continue to play an important role in 5G communication systems has become a huge challenge for PA research. In recent years, several technologies have been proposed to solve this problem, such as simplified real frequency technology (SR FT) [12]- [14], post matching technology [15]- [17], continuous mode DPA [CM-DPA] [18]- [20]. Apart from these technologies, the expansion of the DPA bandwidth can also be effectively realized by improving the load modulation network (LMN) architecture, which is easy to be implemented.…”