Design and Validation of a Concurrent Dual-Band GaN Doherty Power Amplifier
Typ
Examensarbete för masterexamen
Master's Thesis
Master's Thesis
Program
Wireless, photonics and space engineering (MPWPS), MSc
Publicerad
2023
Författare
Ur Rasool Haider, Jamal
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
In the current era characterized by rapid advancements in wireless communication,
the demand for high data rates, multi-band operation and low power consumption
in communication systems like mobile base stations, poses significant challenges. To
address these challenges, it is imperative to explore and devise new power amplifier
(PA) solutions that conform to these stringent requirements. This thesis presents a
comprehensive solution in the form of a dual-band Doherty PA (DB-DPA) to meet
these pressing requirements. DPAs have gained considerable popularity due to their
ability to achieve high back-off efficiency across a wide range of output power levels.
The primary objective of this research is to design and simulate a symmetrical
DB-DPA using state-of-the-art GaN-HEMT technology, for the frequency bands of
1.85 and 2.65 GHz. The load modulation network comprises a wideband combiner
followed by a Chebyshev transformer. Subsequently, the designed DB-DPA is fabricated,
measured, and the obtained results are presented and analyzed in detail.
Through extensive measurements, this study demonstrates that the proposed DBDPA
design delivers satisfactory performance in terms of drain efficiency (DE) and
power gain for both the lower and upper-frequency bands of 1.85/2.65 GHz with
a bandwidth of 100 MHz each. At a peak power of 47.9/47.3 dBm, the DB-DPA
achieves a DE of 55.6/54.5%. Furthermore, at a 6 dB back-off level, the DB-DPA
exhibits a DE of 41.2/44.6% and a gain of 19.5/15 dB for the desired frequencies.
These characteristics position this design as a promising candidate for communication
applications. The findings presented in this research emphasize the potential of
the proposed DB-DPA design and provide a viable solution that meets the growing
requirements of the wireless industry. The comprehensive investigation conducted
through simulations and measurements contributes to the body of knowledge in the
field and provides valuable insights for further advancements in DB-DPA design.
Beskrivning
Ämne/nyckelord
Doherty , Power Amplifier , GaN-HEMT , Efficiency , Dual-Band