&lt;i&gt;C&lt;/i&gt;-band general Class-J power amplifier using GaN HEMT

This letter presents a simple approach to design ultrabroadband power amplifiers (PAs). The theories of the hybrid modes class-EFJ PAs are applied. The relationship between the operating frequency and load impedance is analyzed for class-EFJ PAs. By appropriately selecting load impedances at different frequencies, a PA can work well in 1.0-4.0 GHz with high efficiency. In addition, the second harmonic impedance is obtained by combining the selected fundamental impedance and load-pull simulation. For validation, an ultra-broadband high efficiency PA is implemented. Experiments show that output power is from 40.1 dBm to 42.6 dBm and drain efficiency is between 60.6% and 72.7% at the saturation level in 1.0-4.0 GHz. The ACLR is smaller than -27.2 dBc in the same frequency band with an average output power of 35.2 dBm.

Section: Introductionmentioning

confidence: 99%

“…Among many types of PAs, distributed PAs have large bandwidth but low efficiency [6][7][8][9]. Continuous modes have been introduced to realize ultra-wideband PAs [10][11][12][13][14][15], which has been a widespread study field. It develops into many kinds of continuous modes PAs [16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

An ultra-broadband power amplifier by using a simple analysis method

Zhang

Cheng

Jin

et al. 2021

“…Especially for power amplifiers (PAs), the related characteristics such as bandwidth and efficiency must be greatly improved. Recently, many high-efficiency RF PAs have been reported in [3,4,5,6,7,8,9,10,11]. The traditional harmonic control PAs such as Class F PAs [12,13,14,15] and switch PAs like class E PAs [16,17,18,19] have become the research hotspots because of their ideal 100% drain efficiency.…”

Section: Introductionmentioning

confidence: 99%

Design of broadband Class EF power amplifier based on low-pass filter matching structure

Zhang

Cheng

Liu

2019

This paper proposes a broadband Class EF power amplifier based on a low-pass filter matching structure. Based on the theory of Class EF power amplifiers, the optimal fundamental load impedance required is derived. A broadband matching circuit is then designed using a low-pass filter prototype. In the meantime, a compact harmonic control circuit is proposed to meet the harmonic impedance requirements of class EF power amplifiers. In order to validate the effectiveness of the proposed method, a 2.6-3.6 GHz broadband class EF power amplifier is designed and fabricated. Measurement results show that the output power is between 40.68 dBm and 41.6 dBm at 1 dB compression point in 2.6-3.6 GHz. From 62% to 78% drain efficiency is obtained with gain greater than 10 dB.

“…Broadband and high efficiency are two key requirements in power amplifier (PA) design for forthcoming wireless communication [1]. To improve efficiency of the PA, several kinds of configurations have been widely used, such as Class-E [2,3,4], Class-J [5,6], Class-F/F −1 [7,8]. Nevertheless, Class-E and Class-F/F −1 need precise harmonic impedance control which is impractical in broadband applicaiton.…”

Section: Introductionmentioning

confidence: 99%

Design of broadband power amplifier based on continuous class-F mode with frequency parameterization

Liu

Qiu

et al. 2019

This paper investigates the design space of a broadband continuous Class-F power amplifier (PA) at the device package plane. By parameterizing the empirical parameter by frequency, the extrinsic fundamental and second harmonic impedances can be engineered to rotate clockwise on the Smith chart which can be realized by the realistic matching network. The proposed design methodology is verified with the implementation of 10 W PA which operates across 1.7-3 GHz. The experimental results show that this PA can achieve drain efficiency of 54.7%-74.8% in the whole interesting band.