High-efficiency concurrent dual-band class-E power amplifier with extended maximum operating frequency

Abstract

This paper presents a method for designing high-efficiency concurrent dual-band (DB) class-E power amplifier (PA) that operate above the theoretical maximum frequency (fmax). The excess output capacitances at the two desired frequencies can be compensated using the proposed output matching network without separate design of harmonic compensation network, thus the fundamental and harmonic impedances for DB optimum class-E operation are achieved above the fmax, considering the parasitics of the packaged transistor. For demonstration, the fabricated DB class-E PA using GaN HEMT features the maximum power-added efficiency (PAE) of 74.1% and 72.6% at 1.9 and 2.5 GHz, while the output power is 40.3 and 40.7 dBm, respectively.

Design of class f reconfigurable power amplifiers

“…The research on highefficiency ultra-wideband power amplifiers is mainly aimed at different matching methods to select high-efficiency impedance points to improve efficiency [5][6][7]. Multi-band, miniaturized research is mainly through the use of switches to change the structure of the circuit to achieve the direct switching of different frequency bands [8][9][10]. In this paper, the input matching is done by using a stepped impedance converter, and the output matching is done by adding switches to realize a reconfigurable power amplifier design with high efficiency and high gain after pulling out the optimal source impedance and load impedance for the designed frequency band.…”

Ultra-broadband high efficiency class-EFJ power amplifier with a compact coupling matching structure

“…Compact matching network is gradually taken more considerations. The traditional class-E [3,4,5,6,7,8,9,10,11,12], class-F [13,14,15,16,17,18,19,20,21], class-J [22,23,24,25] modes are high efficiency PA. Class-E works a strong drive and its theoretically efficiency can reach 100%, but its parallel capacitor cannot support the higher frequency band [26]. The class-F PA can solve the above issue, but it is designed in a narrow bandwidth with continuous mode less than an octave.…”

Highly efficient broadband continuous Class-F power amplifier with a novel harmonic matching network

“…Therefore, the broadband and high efficiency are desired simultaneously. Various switch mode PAs are studied, especially class E [3,4,5,6,7,8,9,10,11,12,13,14] and class F [15,16,17,18,19,20,21] PAs. Class-E PA is utilized for designing broadband and high efficiency PA, but its parallel capacitor cannot be fully charged or discharged to generate the ideal drain waveforms, leading to an efficiency degradation [22].…”