A Novel Analog Predistortion Linearizer Based on a Schottky diode for Communication Applications

Karimzadeh Baee, R.; Rahati Belabad, A.; Moazzen, H.; Ahmadi, A.

doi:10.22061/jecei.2021.7851.440

Document Type : Original Research Paper

Authors

Faculty of Communications Technology, Iran Telecommunication Research Center, Tehran, Iran.

https://doi.org/10.22061/jecei.2021.7851.440

Abstract

Background and Objectives: In order to compensate the nonlinearity, several linearization approaches such as feedback, feed-forward, and predistortion have been proposed. Among these linearization methods, the analog predistortion (APD) method is very suitable for the power amplifier and TWTA linearization, because it has a good compromise between complexity, linearity improvement and bandwidth. On the other hand, analog predistortion circuit can be added to existing amplifiers as a separate circuit. Many of the reported linearizer circuits are capable of linearizing power amplifiers with high gain and phase variations. However, these circuits are complex and bulky due to the use of distortion producer, phase shifter, adjustable attenuator, combiner/divider, and control unit. The objective of this paper is increasing the dynamic range of the predistorter by a simple proposed circuit. Hence, linearization capability of the linearizer is boosted.
Methods: A new analog predistortion linearizer based on a coupler and a Schottky diode is presented. The proposed structure satisfies linearization requirements of the solid-state power amplifiers (SSPAs) and traveling wave tube amplifiers (TWTAs). Using a parallel combination of two Schottky diodes along with transmission line in port 2 and 3 of the coupler, the dynamic range of reflection coefficient of each port is increased compared to using a single diode in each branch. By increasing the range of reflection signal, the linearization capability has been increased to linearize power amplifiers and TWTAs. The AM/AM and AM/PM of the linearizer is controlled by changing the bias voltage of power supply.
Results: The simulation results show that about 30° phase shift and 5 dB gain expansion can be compensated for power amplifiers and TWTAs. Because of utilizing two diodes, the linearization capability of the new linearizer is augmented compared to the conventional linearizer.
Conclusion: A novel analog predistortion circuit based on the hybrid coupler and Schottky diodes is presented. The suggested topology increases the dynamic range of reflected power from each port. Using the proposed idea, AM/AM and AM/PM characteristics are expanded such that this characteristic can linearize the power amplifier with high linearity.

Keywords

20.1001.1.23223952.2022.10.1.9.2

Main Subjects

Communications

Open Access

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Publisher

Shahid Rajaee Teacher Training University

References

[1] R. Baldemair, et al., “Evolving wireless communications: Addressing the challenges and expectations of the future,” IEEE Veh. Technol. Mag., 8(1): 24-30, 2013.

[2] A. Rahati Belabad, S.A. Motamedi, S. Sharifian, "A novel generalized parallel two-box structure for behavior modeling and digital predistortion of RF power amplifiers at LTE applications," in Proc. Circuits, Systems, and Signal conf.,. 2714-2735, 2018.

[3] B. Razavi, RF Microelectronics. Upper Saddle River, NJ: Prentice Hall, 1998.

[4] H.L. Deng, D.W. Zhang, D.F. Zhou, S.X. Wang, J. Xuan Wang, "A Ka-band analog predistortion linearizer for traveling wave tube amplifiers," in Proc. Asia-Pacific Microwave Conference (APMC), Nanjing, China, 6-9 Dec. 2015.

[5] P.B. Kenington, High Linearity RF Amplifier Design. Boston, MA, USA: Artech House, 2000.

[6] A. Katz, J. Wood, D. Chokola, “The evolution of PA linearization: From classic feedforward and feedback through analog and digital predistortion,” IEEE Microw. Mag., 17(2): 32-40, 2016.

[7] G. Chandra Tripathi, M. Rawat, “Predistortion linearizer design for ku band rf power amplifier,” in Proc. 2019 National Conference on Communications (NCC), Bangalore, India, 20-23 Feb. 2019.

[8] B. Shi, S. W. Leong, B. Luo, W. Wang, “A novel GHz bandwidth RF predistortion linearizer for Ka band power amplifier,” in Proc. IEEE Region 10 Conf. (TENCON-2017), Penang: 1610-1613, 2017.

[9] X. Zhang, S. Saha, R. Zhu, T. Liu, D. Shen, “Analog pre-distortion circuit for radio over fiber transmission,” IEEE Photon. Technol. Lett., 28(22): 2541-2544, 2016.

[10] H.Y. Jeong, S.K. Park, N.S. Ryu, Y.C. Jeong, I.B. Yom, Y. Kim, “A design of k-band predistortion linearizer using reflective schottky diode for satellite TWTAs,” in Proc. 2005 European Microwave Conference, Paris, France, 4-6 Oct. 2005.

[11] S.C. Cripps, RF Power Amplifiers For Wireless Communications. Norwood, MA: Artech house, 2006.

[12] A. Rahati Belabad, S.A. Motamedi, S. Sharifian, "An adaptive digital predistortion for compensating nonlinear distortions in RF power amplifier with memory effects," Integr. VLSI J., 57: 184-194, 2017.

[13] H.M. Park, D.H. Baek, K.I. Jeon, S. Hong, “A predistortion linearizer using envelope-feedback technique with simplified carrier cancellation scheme for class-A and class-AB power amplifiers,” IEEE Trans. Microw. Theory Techn., 48(6): 898–904, 2000.

[14] H. Moazzen, M. Majidi, A Mohammadi. “Linearization of M-LINC systems using gmp and particle swarm optimization for wireless communications,” AUT J. Model. Simul., 51(2): 221-226, 2019.

[15] H. Moazzen, A. Mohammadi, R. Mirzavand, “Multilevel outphasing system using six-port modulators and Doherty power amplifiers,” Analog Integr. Circuits Signal Process. 90(2): 361-372, 2017.

[16] G.T. Watkins, K. Mimis, “How not to rely on Moore’s law alone: Low-complexity envelope-tracking amplifiers,” IEEE Microw. Mag., 19(4): 84–94, 2018.

[17] R. Zhou, X. Xie, B. Yan, S. Li, "A novel diode-based predistortion linearizer for ka-band power amplifier," in Proc. Microwave and Millimeter Wave Technology (ICMMT), Shenzhen, China, May 2012.

[18] X. Chen, D. Zhou, J. Xu, L. Yang, "Predistortion linearization of a ku-band TWTA for communication applications," in Proc. International Conference on Computer Science and Electronics Engineering, Paris, France, March 2013.

[19] J.X. Qiu, D.K. Abe, T.M. Antonsen, B.G. Danly, B. Levush, R.E. Myers, “Linearizability of TWTAs using predistortion techniques,” IEEE Trans. Electron Devices, 52(5): 718–727, 2005.

[20] K. Yamauchi, K. Mori, M. Nakayama, Y. Mitsui, and T. Takagi, "A Microwave Miniaturized Linearizer Using a parallel Diode with a Bias Feed Resistance," IEEE Trans. Microw. Theory Tech, 2431 - 2435, 1997.

[21] A. Katz, R. Sudarsanam, D. Aubert, “A reflective diode linearizer for spacecraft applications,” in Proc. IEEE MTT-S Int. Microw. Symp. Dig., St.Louis: 661–664, MO, USA, June 1985.

[22] K. Yamauchi, K. Mori, M. Nakayama, Y. Itoh, Y. Mitsui, O. Ishida, “A novel series diode linearizer for mobile radio power amplifiers,” in Proc. EEE MTT-S Int. Microw. Symp. Dig., San Francisco, CA, USA, 1996.

[23] G.C. Tripathi, M. Rawat, "RFin–RFout linearizer system design for satellite communication," IEEE Trans. Electron. Devices, 65(6): 2378-2384, 2018.

[24] H. Deng, D. Zhang, D. Lv, D. Zhou, Y. Zhang, "Analog predistortion linearizer with independently tunable gain and phase conversions for Ka-Band TWTA," IEEE Trans. Electron. Devices, 66(3): 1533-1539, 2019.

[25] H. Deng, D. Lv, Y. Zhang, D. Zhang, D. Zhou, "Compact analog predistorter with shape tuning capability using power-dependent impedance matching network," IEEE Trans. Circuits Sys. II: Express Briefs, 67(10): 1705-1709, 2020.

[26] J. Yi, Y. Yang, M. Park, W. Kang, B. Kim "Analog predistortion linearizer for high-power RF amplifiers," IEEE Trans. Micro. Theory Tech., 48(12): 2709–2713, 2000.

[27] W.M. Zhang, C. Yuen, "A broadband linearizer for ka-band satellite communication," in Proc.IEEE MTT-S Digest: 1203-1206, 1998.

[28] D.M. Pozar, Microwave Engineering, 3rd ed., New York: Wiley, pp.287- 290, 2006.

[29] S. Rezaei, S. H.Mohammad, D. Behzad, M.G. Fadhel, "A systematic methodology to design analog predistortion linearizer for dual inflection power amplifiers," in Proc. Microwave Symposium digest, Conf., Canada: 1-4, 2011.

[30] X. Hu, G. Wang, Z.C. Wang, J.R. Luo, “Predistortion linearization of an X-band TWTA for communications applications,” IEEE Trans. Electron Devices, 58(6): 1768–1774, 2011.

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Journal of Electrical and Computer Engineering Innovations (JECEI)

A Novel Analog Predistortion Linearizer Based on a Schottky diode for Communication Applications

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Volume 10, Issue 1
January 2022
Pages 101-106

A Novel Analog Predistortion Linearizer Based on a Schottky diode for Communication Applications

References

References

Send comment about this article

Volume 10, Issue 1January 2022Pages 101-106

Volume 10, Issue 1
January 2022
Pages 101-106