One of drawbacks of orthogonal frequency division multiplexing(OFDM) technique is the high peak-to-average power ratio (PAPR)of signals,which substantially degrades the efficiency of a linear power amplifier.
In this paper, a low noise high linearity amplifier which works in UMTS frequencies is analyzed and designed, it is used to amplify the distorted signal in WCDMA feed-forward linear power amplifier system.
In the thesis, a high efficiency linear AM amplifier is developed, which is based on the basic theory of EER linearization amplifier technique. The high efficiency digital audio amplifier technology is adopted to develop the power supply modulator and the Class-D switching amplifier technology is adopted to develop the high efficiency RF amplifier.
本论文利用EER( Envelope Elimination and Restoration)线性功放技术的基本原理，采用数字音频功放技术实现高效率电源调制器，采用Class-D开关放大技术实现高效率载频放大器，开发了一个集AM调制和放大于一体的高效率线性功率放大器。
It is predicted that the coherent pumping efficiency may be increased by adjusting the energy of the pump electrons, which will lead to a linear power dependence, a high efficiency, and low threshold currents.
Natural Minimal Set of State Equations of Linear Power Grids
The role of linear power partitioning in beam filamentation
At longer times, the growth follows a more linear power law.
The results of this study suggest a poor repeatability of constant-power upper-body exercises to exhaustion, which may contribute to a poor repeatability of CP and AWC determined from the linear power versus inverse of time model.
This paper deals with extracting the error signals from the opposed-signal cancellation loop and the intermodulated opposed-signal cancellation loop in the feed-forward superlinear amplification The two extractions in question have proved workable and effective
A high efficiency linear RF amplifier is developed, which is based on the basic theory of Envelope Elimination and Restoration (EER) linearization amplifier and Class D audio amplifier technology. The amplifier is amplitude modulated, the efficiency is higher than 75% at 7 MHz.