A 15.5 W Si-LDMOS Balanced Power Ampliﬁer with 53% Ultimate PAE for High Speed LTE B.A. Mohammed, N.A. Abduljabbar, M.A.G. Al-Sadoon, K. Hameed, A.S. Hussaini, S.M.R. Jones, F. Elmegri, R.W. Clark, and R. Abd-Alhameed ( ✉ ) School of Engineering, Design and Technology, University of Bradford, Bradford, UK {mbabuba1,r.a.a.abd,nabeel}@bradford.ac.uk, ash@av.it.pt Abstract. In this paper, a 15.5 W Si-LDMOS balanced power ampliﬁer (PA) technique operating in the 2.620–2.690 GHz frequency band for LTE systems is presented. The ampliﬁer was designed using large signal Si-LDMOS models, which demonstrated saturation P1dB of 41 dBm and 53% PAE. The AM-AM and AM-PM measured data of the balanced ampliﬁer is extracted and embedded in the device under test (DUT) based on IEEE 802.16 OFDM WLAN Transceiver system. A simple linear model was design for behavioral modelling of memory- less baseband digital pre-distorter. The nonlinearity of the balanced ampliﬁer has been compensated using the Simulink version R2011a. Keywords: Balanced power ampliﬁer (BPA) · Linearity · Power added eﬃciency (PAE) · Long term evolution (LTE) · Digital pre-distortion (DPD) 1 Introduction A number of modern wireless communication systems, adopt highly-eﬃcient modula‐ tion schemes to enhance spectral eﬃciency and increase multiple spectral user channels for a wide range of data and voice services. These include orthogonal frequency division multiplexing (OFDM) transceiver systems, such as long term evolution (LTE), wide‐ band code division multiple access (WCDMA), IEEE 802.16 OFDM WLAN transceiver system and numerous IEEE wireless communication systems [1, 2]. These systems are highly sensitive to nonlinear distortion eﬀects in the transmission path, due to their non- constant envelope. Such systems produce high peak-to-average-power-ratio (PAPR). Subsequently, the source of the nonlinear distortion eﬀects in the transceiver conﬁgu‐ ration is the RF power ampliﬁer; this research focuses on the design and modelling of a high energy-eﬃcient power ampliﬁer with high linearity [1–3]. The RF power ampliﬁer is an important device not only in wireless communication systems, but also in TV transmission, radar systems and RF heating. The amplitude of radio frequency signal is increase to a certain level of ampliﬁcation [4, 5]. Spectral eﬃciency and linearity are the main elements driving the design of power ampliﬁer. The most challenging aspect of power ampliﬁer concept is achieving an excellent eﬃciency with linearity [6]. However, the design of a power ampliﬁer has to be accomplished in accordance with the system speciﬁcations, such as operating frequency, bandwidth, output power, gain, linearity, eﬃciency and return loss [7]. According to [8, 9], linearity © ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2017 I. Otung et al. (Eds.): WiSATS 2016, LNICST 186, pp. 193–201, 2017. DOI: 10.1007/978-3-319-53850-1_19