High efficiency GaN current‐mode class‐D amplifier at 2.6 GHz using pure differential transmission line filters

Abstract

In class-D operation the impedances of the output network at each harmonic frequency at the intrinsic terminals of the transistors are of main importance. This reported work demonstrates a new concept using pure differential transmission line filters for the matching of these impedances. Furthermore, de-embedding techniques are used to compensate the impedance transforming characteristics of the package parasitics. A current-mode class-D (CMCD) amplifier with a power-added efficiency (PAE) of 62% and a corresponding output power of 29.5 W at 2.6 GHz has been demonstrated. To the authors' knowledge, these are the highest reported values of the PAE as well as the output power at this frequency for a CMCD.

A 28-GHz Cascode Inverse Class-D Power Amplifier Utilizing Pulse Injection in 22-nm FDSOI

“…Our design also utilizes much less area due to a less number of passive elements; by only using 2 inductors compared to other designs using 5 such as in [12]. Other technologies such as GaAs HBT and GaN are able to report higher efficiencies and output power on the expense of cost and integration capabilities such as in [4], [13] at lower frequency bands. Overall, we are able to report the best performance at RF frequencies as high as 28 GHz compared to similar work reporting compatible efficiencies at 2.25 GHz in [10], [11] and better efficiency compared to other switching PAs near 28 GHz in [18]- [20].…”

Wideband Class-J Power Amplifier Design Using Internal Matched GaN HEMT

“…이와 같은 이동통신 송신시 스템의 특성 중 전력증폭기의 광대역 특성을 구현하기 위하여 고출력 특성이 우수한 GaN 전력증폭 소자가 적용 되고 있으며, D, E, F, F -1 -급과 같은 스위치 모드 전력증 폭기의 설계기법에 대한 연구가 이루어졌다 [2]～ [5] . 최근에 는 통신시스템의 전력효율을 충분히 증가시킬 수 있는 더욱 높은 전력부가효율 특성을 갖는 전력증폭기 설계기 법이 연구되고 있다 [6] .…”