Effects of the adjacent channels on IP3 and IP5 of RF amplifier

Article type: Research Article

Authors: Lin, Qian^a; | Wu, Hai-Feng^b | Liu, Lin-Sheng^c | Cao, Chun^a

Affiliations: [a] Qinghai Minzu University, Qinghai, Xining, China | [b] Chengdu Ganide Technology, Chengdu, China | [c] Chengdu University of Technology, Chengdu, China

Correspondence: [*] Corresponding author: Q. Lin, Qinghai Minzu University, Qinghai, Xining, China. E-mail: linqian@tju.edu.cn

Abstract: This paper discusses the impact of the adjacent channels on the 1-dB compression point, the IP3 and the IP5 of Radio Frequency (RF) amplifier by n-tone test. By combining the theoretical derivation and software simulation, the model analysis for the third/five order polynomial nonlinear amplifier has been achieved. Moreover, the control variable method is adopted to draw the curves for the input/output signals. The research shows that the 1-dB compression point, the IP3 and the IP5 drop as n increases, and they all have symmetry for a given n. The fifth-order polynomial nonlinear amplifier model is proposed, the research shows that the adjacent channels have a great impact on the 1-dB compression point, the IP3 and the IP5 of the desired channel. This effect must be taken into account in actual RF amplifier designs and wireless communication architectures.

Keywords: RF amplifier, the nonlinear effect, adjacent channels, intermodulation, n-tone test

DOI: 10.3233/JAE-210015

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 68, no. 1, pp. 1-12, 2022