Development of a tuner topology for multiharmonic matching and implementation on tunable dual band power amplifier design

Kılıç, Hasan Hüseyin
In this thesis work, the effect of multi-harmonic load matching on improving the efficiency of power amplifiers is investigated. Techniques of efficient power amplifier design are discussed and analyzed in terms of multi-harmonic matching. Several circuit topologies are evaluated for multi-harmonic matching by discussing the advantages and the limitations. Specifically, a detailed multi-harmonic analysis of the triple stub topology is presented. The already-known single frequency impedance matching capability of the triple stub circuit is extended to the 2nd and the 3rd harmonic frequencies. It is shown by analysis for the first time that the triple stub topology is able to satisfy impedance matching not only at the fundamental frequency but also at the 2nd and the 3rd harmonic frequencies simultaneously without any limitation on the fundamental and the harmonic impedances. A novel, highly efficient dual band power amplifier utilizing a tunable triple stub load matching circuit is also designed and implemented. Thanks to the tunable structure, efficiency is maximized in both operating bands of the power amplifier; even tough, the upper band is located at the 2nd harmonic of the lower band.


Design and fabrication of a high gain, broadband microwave limiting amplifier module
Kılıç, Hasan Hüseyin; Demir, Şimşek; Department of Electrical and Electronics Engineering (2011)
Microwave limiting amplifiers are the key components of Instantaneous Frequency Measurement (IFM) systems. Limiting amplifiers provide constant output power level in a wide input dynamic range and over a broad frequency band. Moreover, limiting amplifiers are high gain devices that are used to bring very low input power levels to a constant output power level. Besides, limiting amplifiers are required to provide minimum small signal gain ripple in order not to reduce the sensitivity of the IFM system over t...
Detection of high order M-ARY QAM symbols under transmitter nonlinearities
Gülgün, Ziya; Yılmaz, Ali Özgür; Department of Electrical and Electronics Engineering (2018)
We will investigate the nonlinear effects of power amplifiers on large constellation Quadrature Amplitude Modulation (QAM) in this study. A more than potential feat to enhance transmission rates in next generation wireless networks is high order QAM along with mm-wave transmission. Meanwhile, different types of nonlinearities in the transmitter side may hamper the transmitter rate and decrease receiver performances. From literature, outermost constellation points of QAM schemes are usually more adversely af...
Modeling of asymmetric intermodulation distortion and memory effects of power amplifiers
Yüzer, Ahmet Hayrettin; Demir, Şimşek; Department of Electrical and Electronics Engineering (2011)
This dissertation is focused on developing a new passband behavioral model in order to account for asymmetric intermodulation distortion resulted from memory effect. First, a measurement setup is prepared to measure the AM/AM, AM/PM distortion, magnitudes and the phases of intermodulation (IMD) and fundamental (FUND) components which are created by the amplifier where phase is calculated only by measuring magnitudes. Then, responses of a sample amplifier are measured for different excitation situations (cen...
An experimental study on Power Amplifier linearisation by artificial neural networks Yapay Sinir Aǧlari ile Güç Yükselteç Doǧrusalląstirma Amaçli Deneysel Bir Çalisma
Yesil, Soner; Kolagasioglu, Ahmet Ertugrul; Yılmaz, Ali Özgür (2018-07-05)
This paper represents an experimental study on the linearisation of Power Amplifiers especially on high output power regions by utilizing an artificial neural network structure and open-loop training method. For the same in-band output power, 9dB EVM and 6dB ACLR improvement has been observed on hardware by feeding the proposed digital predistortion signal (DPD) to the PA under test.
A New approach for distributed amplifier design
Yılmaz, İsmail Gökhan; Koç, Seyit Sencer; Demir, Şimşek; Department of Electrical and Electronics Engineering (2012)
In this thesis work, a new distributed amplifier topology is discussed and applied to three different cases. The topology is based on dividing the frequency spectrum into channels and amplifying afterwards. The channelized and amplified signals are then combined at the output for broadband amplification. This topology is used in the design of a three channel 0.1-1 GHz amplifier with a gain of 14.5±0.6 dB. The design is fabricated, and then the measured and simulated results are compared. A second 0.1-1 GHz ...
Citation Formats
H. H. Kılıç, “Development of a tuner topology for multiharmonic matching and implementation on tunable dual band power amplifier design,” Ph.D. - Doctoral Program, Middle East Technical University, 2018.