Volume 21, Issue 3 (JIAEEE Vol.21 No.3 2024)                   Journal of Iranian Association of Electrical and Electronics Engineers 2024, 21(3): 0-0 | Back to browse issues page

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Bahrami M, Shama F, Abbasi H, Havasi R. Design a class J power amplifier with attenuation of unwanted harmonics. Journal of Iranian Association of Electrical and Electronics Engineers 2024; 21 (3)
URL: http://jiaeee.com/article-1-1562-en.html
Design a class J power amplifier with attenuation of unwanted harmonics
Mohammad Bahrami , Farzin Shama * , Hamed Abbasi , Reza Havasi
Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
Abstract:   (240 Views)
One of the concerns in wireless technologies is the transmission of data with low power loss and high speed, which is achieved through RF transmitters. The most important component of an RF transmitter is the power amplifier, which should have a wide bandwidth and high efficiency. Power amplifiers are used in microwave systems, millimeter-wave systems, telecommunications, radar, satellite communications, and medical imaging. Given the mentioned applications, power amplifiers have different parameters and characteristics. Some important parameters include efficiency, power-added efficiency, bandwidth, and linearity. In the presented Class J power amplifier in this article, impedance matching is used to reduce losses and improve the output power. Impedance mismatching leads to the generation of unwanted harmonics, increased power losses, and consequently reduced efficiency. A low-pass filter is designed and presented to remove unwanted harmonics at the output of the power amplifier and perform impedance matching. The notable features of the presented filter include small dimensions, wide cutoff bandwidth, and small transition bandwidth. Simulation results demonstrate that the power-added efficiency (PAE), drain efficiency, and power gain of the proposed Class J power amplifier are 69%, 88.5%, and 16.5 dB, respectively.

 
Keywords: power amplifier, PAE, output power, class J power amplifier, low-pass filter
     
Type of Article: Research | Subject: Electronic
Received: 2023/01/31 | Accepted: 2024/02/28
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