Design And Implementation Of 1.5GHz-Wide Dynamic Range Microwave Receiver

With the continuous development of modern wireless communications, microwave receiver has also been greatly developed. Different kinds of receivers adapted to different systems with the rising of band. Its performance and anti-jamming are also rising. Because of the complexity of the spectrum resource utilization and the tension of application environments, the requirements of microwave receiver are also increasing in different areas of communication, such as high sensitivity, wide dynamic range, and so on. The circuit forms of receivers are gradually optimized. With the continuous improvement of the AGC circuit, microwave receiver also has a wider dynamic range gradually for the dynamic range of the received signal.In this paper, several forms of receiver systems and their comparison are described. After choosing appropriate receiver, different aspects of the design basis of the receiver are described. And then parameters of various parts were allocated for microwave receiver design. Finally, the design of receiver and the selection of receiver devices are introduced.This paper mainly involves low-noise amplification of small-signal, frequency conversion and filtering, the AGC and the local oscillator with high stability. Before making the circuit design of each part circuit, we made the detailed theoretical analysis and research on the practicability and stability of the circuit. With the consideration of the gain of the entire receiver system, the design in this paper effectively increases the gain and dynamic range of the receiver system.In order to make the receiver work reliably and stably, we made the corresponding simulation for each part of the circuit via a variety of simulation software to ensure that the parameters can meet the requirements of the entire system. Finally, we make the PCB design and the CAD design. After the PCB is produced, welded and assembled, we carried out a detailed design verification and testing by using the microwave instrument.After the design is completed, we make a detailed test. The test data meet the design requirements and system requirements. At the same time, the receiver has been applied to the communication system of our company. It works reliably and stably.