| Microwave power amplifier acts as the role of the heart in all microwave systems, its performance has become the bottleneck of the development of communications, electronic warfare, radar and digital TV transmitter systems. As the nerve center of the entire amplifier system, the monitoring system is responsible for monitoring, regulating, controlling and protecting the working state and technical parameters of the amplifier. Furthermore, the product, modularity and universality of amplifier device cann’t be seperated from the flexible controle of monitoring system. Therefore, the research and design of monitoring system of microwave power amplifier is important and practically significant.Currently, the output mode of an amplifier device on the market is generally single. When a variety of output modes are needed, you need more than one amplifier device. Especially in the space experiments where multiple types of microwave source to simulate the environment are needed, using traditional microwave power amplifiers means more amplifier devices, complicated operation, inconvenient control and a large occupation space. In view of this situation, the paper puts forward a new type of multifunctional microwave power amplifier who can work in three output modes, namely pulse mode, continuous wave mode and time-sharing output mode through a rational design of the monitoring system. This new amplifier can realize the function of multiple amplifiers and even achieve the time-sharing output of continuous wave and pulse, which can make the output waveform more diversity.Firstly the background and significance of the research are explained and the development status of domestic and abroad of the system is analyzed. Then, combining structural features and functional requirements of the system, the control method to realize multi-mode output is stated and the control scheme based on DSP and CPLD is determined.This paper focus on introducing hardware and software design of the microwave power amplifier monitoring system in detail.Based on the actual circuit signal characteristics and circuit board design requirements, the hardware design of the system is divided into three modules, namely control board, analog board and standby board. Using a modular design concept, the software design, including man-machine interface, communication protocols, analog acquisition, memory read and write and so on, has been well completed.Finally, a field test on the designed monitoring system is conducted and its result shows that the proposed design of the monitoring system can effectively achieve the control and protection of microwave power amplifier. |
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