Wideband Digital Intensive Doherty Concepts

Wideband Digital Intensive Doherty Concepts

Bagdonas, Faustas (TU Delft Electrical Engineering, Mathematics and Computer Science; TU Delft Microelectronics)

de Vreede, L.C.N. (mentor)
Bootsman, R.J. (graduation committee)
Gajadharsing, John (graduation committee)

Delft University of Technology

Delft University of Technology

Electrical Engineering | Microelectronics

2021-11-18

Many applications require wide bandwidth transmitters, but unfortunately, they usually have way less than 50% average drain efficiency for their modulated signals. This low efficiency is a significant drawback in all wireless applications, both for battery power devices and base stations. The Doherty radio frequency (RF) power amplifier architecture is widely used to enhance the average efficiency for modulated signals in base stations. Its popularity is due to its relatively cheap and simple hardware and its suitability to handle high-power wideband modulated signals. However, even Doherty amplifiers often have less than 50% average efficiency and are restricted in their RF bandwidth.
This thesis reviews recent research on the Doherty power amplifier (DPA) topology and discusses possible power and bandwidth efficiency improvements. In the second part of the thesis, another topology is introduced, which also provides Doherty-like behavior. That topology is called a Pseudo Doherty Load Modulated Balanced Amplifier (PD-LMBA). The performance of PD-LMBA is compared with “conventional” DPAs. Circuit design examples of DPA and PD-LMBA are given. The thesis concludes with a PD-LMBA prototype design, which appears to be very promising in its wideband performance.

RF power amplifier
Doherty
Pseudo Doherty Load Modulated Balanced Amplifier
Wideband
Transmitter
DTX

http://resolver.tudelft.nl/uuid:99cd71df-1b11-4878-80d2-05635824104c

2023-11-26

Student theses

master thesis

© 2021 Faustas Bagdonas