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Doherty-Outphasing Power Amplifier Continuum Theory

Liang, Chenyu
http://orcid.org/0000-0003-0433-6831
http://rave.ohiolink.edu/etdc/view?acc_num=osu1605634146586517

Abstract Details

2020, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
A novel design theory for dual-input Doherty power amplifiers (PAs) is first presented in this dissertation, in which the auxiliary transistors do not fully turn off at backoff power. Given the input design variables selected by the PA designer, a Doherty load modulation scheme is exactly implemented at the current-source reference planes of the transistors by solving for the characteristic impedance of the Doherty quarter-wave transformer and the resistance of the common load. The Doherty output combiner at the package reference plane that sustains the desired dual-input DPA performance is then synthesized using nonlinear embedding technique and built with a lossless and reciprocal passive circuit. Then an analytic theory for dual-input outphasing power amplifiers that incorporates in one unified treatment the continuum of solutions for power combining including the Doherty and Chireix modes is presented. This unified theory developed at the current source reference planes reveals the performance trade-off achieved by all of the possible PA combiners within the continuum of solutions. Moreover, it identifies novel types of dual-input hybrid Chireix-Doherty (HCD) and hybrid Doherty-max (HDmax) PAs that combine key features of the Doherty and Chireix operations such that the fundamental drain voltages applied to both the main and auxiliary transistors remain constant versus output power levels. As a result, these two hybrid PA modes achieve the maximum flat efficiency response versus power, in contrast to the efficiency drop observed between backoff and peak in a conventional Doherty PA. Finally, a new type of wideband dual-input hybrid Doherty outphasing PA (HDO-PA) is developed in which the load-modulation continuously slides from the HDmax PA mentioned above to the conventional Doherty PA mode as the frequency increases. For a symmetric HDO-PA implementation, this corresponds to the peak-to-backoff fundamental voltage ratio of the auxiliary amplifier linearly varying from 9/7 to 2 with frequency. A transmission-line based wideband HDO-PA prototype is first established at the current source reference planes to cover the frequency band from 1.4-GHz to 2.5-GHz. The wideband HDO-PA is implemented next at the package reference planes by synthesizing the wideband combiner circuit required to sustain the intrinsic load-modulation behavior across the entire bandwidth. This wideband PA design methodology is developed by extending the Doherty-Chireix continuum theory, in such a fashion that the wide band PA performance is achieved by sliding the mode of operation versus the frequency with the Doherty-Chireix continuum.
Patrick Roblin (Advisor)
Waleed Khalil (Committee Member)
Kubilay Sertel (Committee Member)
Stephanie Moulton (Other)
140 p.
Electrical Engineering
Radio Frequency Engineering; Radio Frequency Power Amplifier Circuits; Doherty Power Amplifier; Chireix Outphasing Power Amplifier

Recommended Citations

Citations

  • Liang, C. (2020). Doherty-Outphasing Power Amplifier Continuum Theory [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1605634146586517

    APA Style (7th edition)

  • Liang, Chenyu. Doherty-Outphasing Power Amplifier Continuum Theory. 2020. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1605634146586517.

    MLA Style (8th edition)

  • Liang, Chenyu. "Doherty-Outphasing Power Amplifier Continuum Theory." Doctoral dissertation, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1605634146586517

    Chicago Manual of Style (17th edition)

osu1605634146586517
912
© 2020, some rights reserved.Creative Commons License Doherty-Outphasing Power Amplifier Continuum Theory by Chenyu Liang is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.