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A new signal processing method that partially encodes the envelope signal using a delta sigma modulator (EDSM) into a bi-level signal according to the magnitude of the envelope, has been introduced to utilize a high efficiency class-C amplifier for linear amplification. The RF signal is synthesized through the proposed envelope waveform, which is encoded into a pulse signal in the lower power region...
In this paper, the optimum gate control for a peaking cell of a Doherty amplifier is proposed. The proposed gate voltage waveform based on a variation in transcoductance provides a sufficient fundamental current for a peaking cell, which is relevant to the performance of a carrier cell. For further verification, a Doherty amplifier controlled by the proposed method and targeting a 3G LTE base station...
This paper presents a new power amplifier architecture incorporating a multi-level envelope delta sigma modulation (EDSM) encoder together with a dynamic bias control method to improve the overall efficiency. The proposed transmitter was developed based on a 3-level encoding process for quantizing the non-constant envelope signal. Therefore, the power amplifier is always operated under only a two-state...
In this paper, an analysis of a power amplifier manipulated using a second harmonic (PA-2HM) is described using a remarkable correlation between the fundamental and second harmonic impedances. The output loading condition, made up of an optimum fundamental impedance mapped to the conditional second harmonic reactance, allows us to achieve a high-efficiency power amplifier (PA) with a simple output...
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