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An optimal three-harmonic definition of class F at the intrinsic level is presented for realistic transistor models exhibiting IV characteristics with a nonzero knee voltage. This updated class-F definition is needed for use with the recently reported embedding device model, which predicts in a single harmonic balance simulation the voltage and current waveforms required at the package reference planes...
The inspection of the current and voltage waveforms at the current source reference planes of transistor models provides power amplifier (PA) designers with useful insights for identifying the class of operation of PAs. However when a specific class of operation at the current source reference plane is targeted, time-consuming multi-harmonic load- and source-pull simulations are required. Alternatively...
Waveform engineering is commonly used to optimize the power efficiency, linearity and output power of power amplifiers (PA). In this search for the optimal waveforms, PA designers have become interested in knowing the internal mode of operation of the device at the current-source reference-planes. However given the huge search space for the input and output multi-harmonic terminations required to...
As wireless cellular communication keeps expanding toward higher bandwidth, multiband signals, and high frequencies of operation, the design of power efficient radio frequency power amplifiers (PAs) for cellular phone basestations is submitted to more stringent requirements. This paper discusses the promising technique of nonlinear embedding, which may help stream line the design of such PAs. To this...
Circuit-based large-signal device models remain extensively used to design integrated and hybrid microwave circuits. It has been recently demonstrated that device models can also be profitably applied under the form of a nonlinear embedding device model to help with the synthesis of multi-transistor power amplifiers (PA) such as Doherty PAs. In this paper we shall discuss this new design process from...
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