科研之友
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摘要
With developments in communications and the increasing demand for voice, video, data, etc. transmissions, the need for high-efficiency power amplifiers (PAs) has increased. The PAs should also support wideband AM-PM modulation. As well, there is a trade off between signal quality and efficiency. Increased efficiency is a necessity so as to increase mobile battery life. PAs may be designed in the saturation region. However, in spite of the higher efficiency and higher output power achieved by using PAs in the saturation region, the signal quality will be distorted. To address this, several linearization methods have been considered, each having its own advantages and disadvantages. Reduced battery life and heat dissipation are two of the most significant industry issues for EDGE-based handsets. These issues are largely a result of the poor efficiency of the transmitter. This puts great pressure on the designer to reduce power consumption and to increase power-added efficiencies in the transmitter. Polar modulation theory, based on separating the amplitude and phase information of the signal, represents a new method for transmitting signals in modern mobile communications technologies. It improves both efficiency and output power and prevents signal distortion and amplitude information loss. In this paper, the polar modulation method is incorporated into signal amplifying systems, one with a class C PA and one with a class E PA, and their functional results compared. The advantages of using polar modulation instead of conventional methods are also investigated. The simulation results are in excellent agreement with the theory.
- 出版日期2012-4
