| With the rapid development of modern wireless communications, RF power amplifier as an important component of the RF transmitters, its performance largely affects the merits of the communication quality. Thus, the RF power amplifier research and design has important research value and practical significance.This paper analyzes the design principle of the RF power amplifier. As in RF systems, the distribution of parameters, two-port network is difficult to obtain open and short circuit, which is not in accordance with the low-frequency circuit voltage and current approach to the design and analysis of circuit, a dual-port network with the structure of the S amplifier design parameters for the significance of the RF power amplifier design of the technical indicators, such as the power amplifier gain and stability, nonlinear, intermodulation signals. To work due to RF power amplifier large signal conditions, there must be non-linear distortion, intermodulation signal which longevity has seriously affected the output signal, so the nonlinear power amplifier research has become an important and difficult, the paper analysis of its nonlinear characteristics, and amplifier linearization techniques are discussed. On this basis, ADS simulation platform based on principles of success using load-pull design a RF power amplifiers, the amplifier operating frequency in1950MHz, input and output VSWR is less than2, the output power of about35dBm, amplification gain of12dB. The final simulation results show that to achieve the desired design requirements.With the technology of semiconductor devices and integrated circuit design technology, MMIC RF IC technology will be particularly rapid development, on the other hand, with DSP technology, and digital pre-distortion technology, the nonlinear RF amplifier will be improved, For efficiency, the need to introduce Doherty and other technology to improve the performance of the amplifier, the RF power amplifier design will become the hot research field. |
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