Dr. Senad Bulja, PhD, FIET, SMIEEE

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Home » Researches » High-efficiency Doherty power amplifiers: historical aspect and modern trends

High-efficiency Doherty power amplifiers: historical aspect and modern trends

Dr. Senad Bulja 09/01/2023Download Here

Amplifiers are essential for the correct operation of all communication systems. In addition to the requirements for their linear operation, there is also a requirement for efficiency. Usually, efficient amplifiers are not necessarily linear and the process of linearization is usually performed using a Digital Pre-Distorter (DPD) on an efficient amplifier, which distorts the input signal in a specific way to yield a linear output.  There are several amplifier efficiency enhancement techniques, however, the Doherty amplifier, introduced in 1936 [1], has been the mainstay in the telecommunications industry due to its inherent simplicity and efficiency. 

This paper-review describes the historical aspect of the Doherty approach to the power amplifier design introduced in 1936 and modern trends in Doherty amplifier design techniques using multistage and asymmetric multi-way architectures. To increase efficiency over the power backoff range, the switch-mode Class E, conventional Class F, or inverse Class F operation mode by controlling the second and third harmonics can be used in the load network. The Doherty amplifier with a series connected load, inverted and dual-mode Doherty architectures are also described and discussed. Finally, examples of the lumped Doherty amplifier implemented in monolithic microwave integrated circuits and broadband capability of the two-stage Doherty amplifier are given.

Fig. 1. Doherty amplifier basic schematics with lumped elements
Fig. 1. Doherty amplifier basic schematics with lumped elements

[1] W. H. Doherty (September 1936). “A New High Efficiency Power Amplifier for Modulated Waves”. Proceedings of the IRE. 24 (9): 1163–1182. doi:10.1109/JRPROC.1936.228468.

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Profile & Bio

Senad Bulja, Ph.D., FIET, SMIEEE 

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PROFESSIONAL Profile

  • Accomplished career of over 19 years demonstrating consistent success as a Researcher, Leader and Mentor in the Wireless industry research environment.
  • Excellent Scientific contributions in the field of RF, EMC and telecommunications with 4 Nature Journal publications and over 70 peer-reviewed articles and conference papers
  • Strong leadership skills demonstrated by leading Ph.D. level educated cross-continental and cross-departmental teams to successful project execution.  
  • Proven Strategic Business Impact – introduced own developed technology into Nokia’s future technology roadmap (RF filters) and business transfer of the smart surface technology. 
  • Creative, internationally awarded and well-driven inventor with over 70 filed patents in the area of hardware for Radio Frequency (RF), Wireless Sensor Networks (WSN), Internet of Things (IoT) and wireless systems architectures. E.g. Nokia patent award entitled: “A top inventor in implementation patent first filings”, 2020.
  • Significant contribution in the identification of high revenue IP assets and leadership on the creation of Nokia’s patent portfolio roadmap. 
 

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