Class F Power Amplifier Thesis

Class F Power Amplifier Thesis-14
Three PAs were designed, one operating at 0.9 GHz and the other two at 2.45 GHz.

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Based on this research two papers have been published in journals.

Two AIA designs operating at 2.45 GHz are presented in this thesis.

For these three PAs the simulated drain voltage/current waveforms, return loss, stability factor, power gain, output power and power added efficiency (PAE) are presented.

The practical results are compared with those obtained by simulation.

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ABSTRACT This thesis presents the research carried out into the effects of load and source harmonic terminations on the efficiency of a class-F power amplifier (PA).The antenna must not only act as a radiator and a harmonic suppresser but also as an optimum load for the PA so that it can be connected directly to the active device in order to obtain maximum efficiency.An extensive study on this antenna was carried out.The study focused on the technique used in designing a class F PA especially at GHz frequencies. Several works on the class F PA with different semiconductor technologies from year 2001 to 2016 are discussed. The formulas for the first four mode frequencies were derived using odd and even mode analysis while a new and simpler formula for the fourth mode frequency was obtained.A systematic design approach to obtain the dimensions of the antenna is presented for an antenna operating at a given fundamental mode frequency.As the effect of gate capacitance is small at this frequency, the source matching network was designed to obtain a conjugate match at the fundamental frequency only.At the higher frequency of 2.45 GHz, the gate capacitance has a larger effect on the efficiency of the PA and hence two designs were investigated and compared.A probe feed location was found to obtain the required optimum impedance at th...Highly efficient class F power amplifier (PA) in Gigahertz (GHz) frequencies for wireless application is reviewed in this paper.


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