High efficiency 88-108MHz, 25W class-E PA for transmitters in smart cities

Shawkat Ali, Rashad Ramzan, Sher Azam

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

In this paper a low power high efficiency Class-E RF power amplifier (Pa) for broadcast FM band (88∼108MHz) application is presented. This PA suitable for low power transmitter's used in smart cities. Traditionally switching PAs are not used for FM broadcast application due to high emissions in side bands. Double tuning networks and harmonic traps are used at the input and output of the amplifier to achieve adjacent channel purity (ACP) more than-80dBc in order to conform to the limits imposed by the Federal Communication Commission (FCC) for Low Power FM (LPFM) transmitters. This power amplifier has output power of 25W (43.9dBm) and power added efficiency (PAE) of 80.3% with the gain of l5dB. This class-E power amplifier is driven by a class-A RF amplifier with output power of 2W (33dBm) and 50Ω impedance. The amplifier is characterized for input RF power sweep, Frequency sweep and adjacent channel power ratio (ACPR). The proposed Class-E RF power amplifier also provides 50Ω input and output impedance matching for seamless interfacing with standard FM antennas or power combiners. The typical applications are low power FM transmitters for educational, civic, health, emergency and disaster services.

Original languageEnglish
Title of host publication2017 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-4
Number of pages4
ISBN (Electronic)9781538608722
DOIs
Publication statusPublished - Jun 28 2017
Event2017 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2017 - Ras Al Khaimah, United Arab Emirates
Duration: Nov 21 2017Nov 23 2017

Publication series

Name2017 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2017
Volume2018-January

Other

Other2017 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2017
Country/TerritoryUnited Arab Emirates
CityRas Al Khaimah
Period11/21/1711/23/17

Keywords

  • ACPR
  • Broadcast FM
  • Class-E
  • FM Broadcasting
  • Filters
  • Harmonic Trap
  • Impedance Matching
  • Power Amplifier (PA)
  • Smart Cities

ASJC Scopus subject areas

  • Artificial Intelligence
  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Instrumentation
  • Computer Science Applications

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