GaN Widening Possibilties for PAs : Wide-band GaN Power Amplifiers Utilize the Technology's Special Properties

Ghavidel, Ali; Tamjid, Farshid; Fathy, Aly E.; Kheirdoost, Ali

doi:10.1109/mmm.2017.2680059

Cited by 19 publications

(5 citation statements)

References 32 publications

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“…However, achieving enough power and high gain is particularly demanding at frequencies above 15 GHz. Moreover, the widespread adoption of multi-carrier modulation schemes and the continuous increase of base-band signal bandwidths are currently making it a great challenge to simultaneously obtain highly efficient and wide-band PA operation [5].…”

Section: Power Amplifier Design Challengesmentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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Abstract:Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed.

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Section: Power Amplifier Design Challengesmentioning

confidence: 99%

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

et al. 2017

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“…In this context, wireless communication systems have undergone a series of major changes. As the key component of the frontend transmitter in wireless communication systems, power amplifier (PA) has been obtained more attention [1]. However, with the urgent requirements for high output power (Pout) and high frequency, it faces more stringent challenges for application with server environments.…”

Section: Introductionmentioning

confidence: 99%

Temperature Characteristics Survey for a LDMOS 1000W Shortwave Power Amplifier

lin,

wang,

You

et al. 2024

Preprint

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In order to study the temperature characteristics of the LDMOS 1000W shortwave power amplifier under different temperature, a series of tests have been carried out here. The results showed that Pout, Gain, PAE, two-tone power, second harmonic and third harmonic of the PA decrease dramatically with rising temperature. Meanwhile, when the number of cycles increases from 1 to 5, its Pout, Gain, PAE, two-tone power, second harmonic and third harmonic generally show the downward trend. Further analysis shows that this degradation is caused by the increase of temperature, the decrease of electron mobility and the increase of scattering between electrons and the lattice, which lead to the generation of heat and the intensification of the self-heating effect. At the same time, high temperature also lead to the increase of thermal resistance (Rth), which causes decrease in the efficiency of PA. Therefore, to ensure that the whole amplifier can maintain stable at different temperatures, a temperature compensation circuit is proposed to offset the performance degradation which can provide important reference for the reliability design of PA.

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“…With the advent of the modern technologies for wideband PAs [9], wideband combining techniques became necessary. The power handling characteristics and losses in microstrip radial power combiners [3] is a challenge that limits the combining efficiency of the wideband radial power combiners.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Formulation and Experimental Evaluation of Efficient 8-Way Microwave Radial Power Combiner for High Power Applications

Ahmadi,

Kheirdoost

2023

itrc

Self Cite

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An 8 port narrowband Radial Power Combiner (RPC) with excellent combining efficiency is presented. A novel useful criteria for optimal design of the RPC is developed and the design is studied based on it. Also to provide a reliable, tolerant and cost effective mechanical design, the mechanical structure of the combiner is simplified for fabrication and assembly. The designed RPC has standard waveguide ports at inputs, so it can be used in standard high power applications without any adaptors. The physical structure simplicity guarantees the product reliability for industrial high power applications. The optimized RPC design is fabricated and the measurement results are presented. The back-to-back measurement setup using customized through lines and two identical combiners have helped to take into account other efficiency degrading phenomena like port junctions' discontinuity. It is shown that simulated power combining efficiency of 99% and measured power combining efficiency of 97.7 % is achieved.

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GaN Widening Possibilties for PAs : Wide-band GaN Power Amplifiers Utilize the Technology's Special Properties

Cited by 19 publications

References 32 publications

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

Temperature Characteristics Survey for a LDMOS 1000W Shortwave Power Amplifier

Mathematical Formulation and Experimental Evaluation of Efficient 8-Way Microwave Radial Power Combiner for High Power Applications

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