Electrical and Computer Engineering
Journal or Book Title
IEEE Transactions on Circuits and Systems II: Express Briefs
Recently, a concurrent dual-band class-D power amplifier has been demonstrated to overcome the limitations of reduced efficiency in concurrent dual-band linear power amplifiers. However, the configuration could not be symbolically analyzed like its single-band counterpart due to the complicated nature of dual-band signals. This paper aims to provide a theoretical basis for idealized concurrent dual-band class-D operation. It applies an alternate representation of the sum of two sinusoids which helps the formulation of a technique to analytically extract the complex Fourier series coefficients of the current and voltage waveforms of the power amplifier. Expressions for output power and efficiency are derived, showing a theoretical drain efficiency of 100%. The theoretically obtained results are validated using observations from literature as well as independent Harmonic Balance simulation.
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Roy, Subhanwit and Neihart, Nathan, "Fourier Analysis of Signal Waveforms in An Ideal Concurrent Dual-Band Class-D Power Amplifier" (2020). Electrical and Computer Engineering Publications. 246.