A Class-F Based Power Amplifier with Optimized Efficiency in Triple-Band

Abstract

A Class-F mode-based power amplifier (PA) with optimized efficiency in triple-band was designed using a simple and systematic approach. By considering the second and third harmonic terminations of the PA, the relationship between the output impedance design space and the drain efficiency (DE) is extracted by large-signal model simulation. Then, a low-pass matching topology is utilized for the triple-band efficiency optimization. The method is justified by both simulation and measurement of a triple-band PA to integrate three functions into one hardware, i.e., 1518–1525 MHz for mobile communication, 2.1 GHz for telemetry and control, and 2.492 GHz for navigation signal transport. The proposed PA achieves a measured result of high DE (63% at 1.52 GHz, 71% at 2.1 GHz, 59% at 2.492 GHz) in the three bands with an output power of at least 40 dBm.

Design of Efficient Concurrent Dual-Frequency Doherty Power Amplifier Based on Step Impedance Low-Pass Filter

“…The Doherty power amplifier (DPA) is based on the principle of active load modulation [3] to maintain high efficiency at OBO. A concurrent multi-band Doherty power amplifier [4,5] can achieve a reasonable allocation of spectrum resources and reduce interference to adjacent channel signals. Compared with the traditional multi-channel single-frequency power amplifier, the concurrent dual-band Doherty design structure can also effectively reduce system size and cost as well as have good back-off efficiency [6].…”

Design of Concurrent Tri-Band High-Efficiency Power Amplifier Based on Wireless Applications

“…A transmission line is added between the two stages to adjust the impedance of the second and third harmonics without changing the impedance at the fundamental frequency. Harmonic control is very effective for improving the efficiency of RF transistors, especially when using the Class-F [13][14][15][16][17] work model.…”