DESIGN AND IMPLEMENTATION OF AN RF BALANCED AMPLIFIER FOR WIRELESS COMMUNICATION SYSTEMS

FIRAS M. ALI, ALI E.  SHATUB; MEJWEL F.  BADER

doi:10.26682/csjuod.2023.26.2.50

FIRAS M. ALI, ALI E. SHATUB Dept.of Electrical Engineering, University of Technology, Baghdad- Iraq
MEJWEL F. BADER Dept.of Electrical Engineering, University of Technology, Baghdad- Iraq

DOI: https://doi.org/10.26682/csjuod.2023.26.2.50

Keywords: RF Amplifiers, Balanced Amplifier, pHEMT, Microstrip Matching Networks, Branch Line Couplers.

Abstract

This paper involves a design and implementation of a radio-frequency (RF) balanced amplifier for modern wireless communication systems. The proposed circuit consists of two identical microwave GaAs pseudomorphic high electron mobility transistor (pHEMT) amplifiers connected together using 3-dB hybrid couplers. The input and output matching circuits for each transistor are designed using microstrip lines to ensure low input/output voltage standing wave ratio (VSWR) and stable operation. The amplifier circuit is initially designed and simulated with the aid of the Keysight’s ADS software to operate in the mobile communication band from 850 to 950 MHz. The circuit has then been implemented and tested practically in the laboratory. The measured performance results show a power gain of 15 dB at the desired frequency band and a 1-dB gain compression point output RF power of +19 dBm at the center frequency of the band.

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