Fourier Analysis of Signal Waveforms in An Ideal Concurrent Dual-Band Class-D Power Amplifier

Date
2020-03-13
Authors
Roy, Subhanwit
Neihart, Nathan
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Abstract

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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This is a manuscript of an article published as Roy, Subhanwit, and Nathan M. Neihart. "Fourier Analysis of Signal Waveforms in An Ideal Concurrent Dual-Band Class-D Power Amplifier." IEEE Transactions on Circuits and Systems II: Express Briefs (2020). DOI: 10.1109/TCSII.2020.2980732. Posted with permission.

Keywords
Carrier Aggregation, Class-D, Complex Fourier Series, Concurrent Dual-band, Power Amplifiers.
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