Design And Realization Of RF Front-End In Wireless Senseor Network

Wireless sensor network (WSN) is a new research field of computer science, which is a network comprising of a series of WSN incorporates sensor, embedded system, distributed information and wireless communication technology. WSN completes real-time monitoring, sensing and sampling information of different environment or objects being monitored cooperative, then it processes the information and transmits the information to the users. The key technologies of WSN consist of network topology architecture, nodes hardware platform and nodes software system, such as link layer protocol, MAC protocol and management software etc.Wireless sensor network (WSN) is a network, it has self-organization, the rapid deployment and fault tolerance characteristics, the above described features ensure a wide range of applications for sensor networks such as military, environment, health, industry control and so on. Recent advances in wireless communication, integrated circuit, micro-electro-mechanical systems (MEMS) technology have enabled the development of low-cost, low-power, multi-functional sensor nodes that are small in size and communicate in short distances. The mature in technique and quantity of application needs attract more and more concern. Wireless sensor network is becoming the domestic and international research hot in wireless network.This paper deeply and detailed discussed the principle, design and simulator work on the critical devices of RF (radio frequency) front-end transceiver. Briefly introduces the background of the paper and the hard point of technology, and introduces the construct of general telecommunicate transceiver. Then deeply analyze the central technical parameter of the system and each part's parameter of the RF front-end transceiver. Then particularly elaborate the design of this project, application and realization of each function, and do analysis on the system link, ADS simulation of the whole transceiver, and some problems occurs in the design. At last put forward the problem should be paid attention to during PCB design, give out the conclusion of EMI in PCB design.In designing process, the designer adopts a new circuit design method: First, bring out budget for the system based on experience and project requirements. Second, select the components and their typical application circuits. Third, analyze the results and propose the final suggest. Finally, we confirm a design and parameters of every part, select the components, confirm the function of the circuits, and accomplished the simulation and the test of the system.