Design and Implementation of the 20 W Highly Linear Broadband Two-Stage VHF/UHF Power Amplifier for Improving Efficiency Flatness

doi:10.22716/sckt.2020.8.3.020

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2020 Vol.8, Issue 3 Preview Page Next Page

Research Article

Design and Implementation of the 20 W Highly Linear Broadband Two-Stage VHF/UHF Power Amplifier for Improving Efficiency Flatness 효율 평탄도 개선을 위한 20 W 고선형 광대역 2단 VHF/UHF 전력 증폭기의 설계와 구현: Dong-Hee Jang¹
장동희¹; ¹Assistant Professor, Asan Campus of Korea Polytechnics

¹한국폴리텍대학 아산캠퍼스 조교수

30 September 2020. pp. 59-68

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Abstract

본 논문에서는 다양한 무선 통신 시스템의 통합을 위해 30-500 MHz의 동작 주파수를 가지는 20 W 2단 VHF/UHF 전력 증폭기를 설계하고 구현하였다. 낮은 주파수 대역에서 효율 평탄도를 개선하기 위해 공진을 조정할 수 있는 부궤환 회로를 제안하였다. 전력 증폭단은 동축 케이블 발룬을 적용한 푸시풀 구조를 사용하였고 전치왜곡 구동단을 적용하여 2단 전력 증폭기의 선형성을 최적화하였다. 제안된 전력 증폭기를 검증하기 위해서 2-tone 테스트 신호를 사용하여 측정한 결과, 광대역 전력 증폭기는 30~500 MHz 대역에서 평탄화된 이득, 출력 전력, 효율, 선형성 특성을 얻었다. 제안된 설계 방법을 토대로 구현한 2단 VHF/UHF 전력 증폭기는 디지털 전치왜곡기와 결합되어 높은 선형성을 얻을 수 있었다.

In this paper, the 20 W 2-stage VHF/UHF power amplifier is designed and implemented for integrating various wireless communication systems in a frequency range of 30 to 500 MHz. The negative feedback circuit with a resonance adjustment is proposed for improving the efficiency flatness at a lower frequency band. The power amplification stage utilizes a push-pull structure with a coaxial cable balun. The drive amplification stage operates as a predistorter for optimizing the linearity of two-stage power amplifier. For demonstration of the power amplifier’s performance, a 2-tone test signal is used. The broadband power amplifier can obtain the improved flatness characteristics for gain, output power, efficiency, and linearity in a frequency range of 30 to 500 MHz. From the digital predistortion measurements, the proposed power amplifier can achieve the higher linearity.

Keywords

Broadband

Power amplifier

Negative feedback

Resonance

Predistortion

References

W. Sear and T. W. Barton, “A Baseband Feedback Approach to Linearization of a UHF Power Amplifier”, IEEE MTT-S International Microwave Symposium Digest, pp. 75-78, 2019.10.1109/MWSYM.2019.8700736
D. Vegas, M. P Pampin, J. Perez-Cisneros, M. N. Ruiz, A. Mediavilla, and J. A. Garcia, “UHF Class-E Power Amplifier Design for Wide Range Variable Resistance Operation”, IEEE MTT-S International Microwave Symposium Digest, pp. 297-300, 2018.10.1109/MWSYM.2018.8439591
K. W. Kim, M. C. Seo, J. Y. Cho, S. C. Yoo, et al., “Design of High-Power and High-Efficiency Broadband Amplifier Using 1:4 Transmission Line Transformer”, The Journal of Korean Institute of Electromagnetic Engineering and Science, Vol. 21, No. 2, pp. 121-128, 2010.10.5515/KJKIEES.2010.21.2.121
K. Krishnamurthy, T. Driver, R. Vetury, and J. Martin, “100 W GaN HEMT Power Amplifier Module with > 60% Efficiency over 100-1000 MHz Bandwidth”, IEEE MTT-S International Microwave Symposium Digest, pp. 940-943, 2010.10.1109/MWSYM.2010.5518242
S. Pisa, S. Chicarella, R. Cusani, and J. Citrolo, “30-512 MHe power amplifier design using GaN transistor”, Microwave and Optical Technology Letters, Vol. 60, No. 5, pp. 1280-1286, 2018.10.1002/mop.31155
신종균, 기술기준의 포함된 새로운 대한민국 주파수 분배표. 서울: 한국전파진흥협회, 2013.
N. Pothecary, Feedforward Linear Power Amplifiers. Norwood, MA: Artech House, 1999, pp. 113-119.
C. G. Gentzler and S. K. Leong, “Broadband VHF/UHF Amplifier Design using Coaxial Transformers”, High Frequency Electronics, pp. 42-51, 2003.
S. H. Chun, D. H. Jang, J. Y. Kim, and J. H. Kim, “Inverted Asymmetric Doherty Power Amplifier Driven by Two-Stage Symmetric Doherty Amplifier”, Electronics Letters, Vol. 46, No. 17, pp. 1208-1209, 2010.10.1049/el.2010.1708

Information

Publisher :The Society of Convergence Knowledge
Publisher(Ko) :융복합지식학회
Journal Title :The Society of Convergence Knowledge Transactions
Journal Title(Ko) :융복합지식학회논문지
Volume : 8
No :3
Pages :59-68
DOI :https://doi.org/10.22716/sckt.2020.8.3.020

[1] W. Sear and T. W. Barton, “A Baseband Feedback Approach to Linearization of a UHF Power Amplifier”, IEEE MTT-S International Microwave Symposium Digest, pp. 75-78, 2019.10.1109/MWSYM.2019.8700736

[2] D. Vegas, M. P Pampin, J. Perez-Cisneros, M. N. Ruiz, A. Mediavilla, and J. A. Garcia, “UHF Class-E Power Amplifier Design for Wide Range Variable Resistance Operation”, IEEE MTT-S International Microwave Symposium Digest, pp. 297-300, 2018.10.1109/MWSYM.2018.8439591

[3] K. W. Kim, M. C. Seo, J. Y. Cho, S. C. Yoo, et al., “Design of High-Power and High-Efficiency Broadband Amplifier Using 1:4 Transmission Line Transformer”, The Journal of Korean Institute of Electromagnetic Engineering and Science, Vol. 21, No. 2, pp. 121-128, 2010.10.5515/KJKIEES.2010.21.2.121

[4] K. Krishnamurthy, T. Driver, R. Vetury, and J. Martin, “100 W GaN HEMT Power Amplifier Module with > 60% Efficiency over 100-1000 MHz Bandwidth”, IEEE MTT-S International Microwave Symposium Digest, pp. 940-943, 2010.10.1109/MWSYM.2010.5518242

[5] S. Pisa, S. Chicarella, R. Cusani, and J. Citrolo, “30-512 MHe power amplifier design using GaN transistor”, Microwave and Optical Technology Letters, Vol. 60, No. 5, pp. 1280-1286, 2018.10.1002/mop.31155

[6] 신종균, 기술기준의 포함된 새로운 대한민국 주파수 분배표. 서울: 한국전파진흥협회, 2013.

[7] N. Pothecary, Feedforward Linear Power Amplifiers. Norwood, MA: Artech House, 1999, pp. 113-119.

[8] C. G. Gentzler and S. K. Leong, “Broadband VHF/UHF Amplifier Design using Coaxial Transformers”, High Frequency Electronics, pp. 42-51, 2003.

[9] S. H. Chun, D. H. Jang, J. Y. Kim, and J. H. Kim, “Inverted Asymmetric Doherty Power Amplifier Driven by Two-Stage Symmetric Doherty Amplifier”, Electronics Letters, Vol. 46, No. 17, pp. 1208-1209, 2010.10.1049/el.2010.1708

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