A Power Amplifier with Large High-Efficiency Range for 5G Communication

Abstract

This paper presents a new method to design a Doherty power amplifier (DPA) with a large, high-efficiency range for 5G communication. This is through analyzing the drain-to-source capacitance (CDS) of DPAs, and adopting appropriate impedance of the peak device. A closed design process is proposed, to design the extended efficiency range DPA based on derived theories. For validation, a DPA with large efficiency range was designed and fabricated by using two equal devices. The measured results showed that the saturated output power was between 43.4 dBm and 43.7 dBm in the target band. Around 70% saturated drain efficiency is obtained with a gain of greater than 11 dB. Moreover, the obtained drain efficiency is larger than 50% at the 10 dB power back-off, when operating at 3.5 GHz. These superior performances illustrate that the implemented DPA can be applied well in 5G communication.

A High-Relative-Bandwidth Doherty Power Amplifier with Modified Load Modulation Network for Wireless Communications

“…In order to realize an OBO of 6 dB, the real part of Z4 𝑅𝑒(𝑍 /𝑅 ) should be set equal to 2. Then, we can deduce the following two expressions about XA: After substituting (9) to (8), the load impedance of the main PA transistor Z M,OBO (Z 4 ) can be obtained as…”

“…Load modulation PAs, such as Doherty [5], out-phasing [6], and load modulation balance amplifiers (LMBAs) [7], can maintain high efficiency at the power back-off (OBO) level and are promising candidates for meeting the stringent linearity requirements. Currently, DPAs are widely used in wireless communications due to their easy-to-implement architecture [8,9]. However, the bandwidth of traditional Doherty PAs is restricted by impedance conversion networks, offset lines, matching networks, and package parameters of transistors [10][11][12][13].…”

A Compact Metamaterial Dual-band Branch-line Coupler for 5G Applications

“…Couplers are commonly used in applications involving RF, microwave, and millimeter-wave frequencies, with branch-line couplers (BLCs) being particularly prominent among the various types of couplers available [2]. Couplers play a crucial role in several applications, such as Doherty power amplifiers [3], balanced power amplifiers [4], and balanced mixers [5]. Additionally, they can be employed for power splitting in numerous other applications [6].…”

An ultra-broadband power amplifier by using a simple analysis method

“…With the development of communication, the operating bandwidth is becoming larger and larger [1][2][3][4][5]. To design ultra-wideband power amplifiers (PAs) is an interesting research topic.…”