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This paper presents a simulation related to phase signal leakage in an improved Kahn based modulator for a high efficiency power amplifier. It contains a mathematical modeling of a leaked phase signal, an EVM simulation versus leakage, and a validation of the simulation method through comparison with measurement results. These are done using a LTE signal which has a bandwidth of 10 MHz, a PAPR of...
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...
This paper presents a 1.5 bit (3-level) envelope amplifier to improve the overall efficiency of wideband high linearity envelope tracking power amplifier. The proposed envelope amplifier has been devised with two switches providing the different supply voltages. Since the unnecessary current (ripple current) induced by a switching stage can be reduced by the multi-level quantization, the efficiency...
In this paper, the physical constraint effects imposed on the knee voltage along with the variation of optimum load resistance for high efficient Class-F-1 amplifier are analyzed. For the accurate analysis, the new current waveform models are identified, and the realistic approach incorporating with a non-zero knee voltage and a voltage dependent-nonlinear capacitance is employed to derive the voltage...
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