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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 Doherty power amplifier (DPA) controlled by the optimized bi-level supply modulator to improve an overall efficiency. By utilizing the supply modulation method determined by the probability density function (PDF) of an interest signal, an estimated average efficiency can be improved as much as 8.5 % compared with that of conventional DPA. For the verification the proposed DPA...
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...
This paper presents novel simulation method and possibility of class S power amplifier for LTE base station. A baseband signal with 9.7 dB Peak-to-Average Power Ratio (PAPR) is used to represent LTE signal, which is about top 12-percent of the PAPR statistics. The channel bandwidth of 10 MHz and carrier frequency of 890.88 MHz is used to represent prearranged LTE service in Korea. A Band-Pass Delta-Sigma...
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