Development Of IMT-Advanced Wideband Zero-IF Receiver RF Front-End

As the rapid development of mobile communication, the demands on wireless transmission rates and services are increasing. The International Telecommunication Union (ITU) has drawn up the global standardization work plan of the IMT-Advanced system, which has to support increased peak transmission rate to support new services and applications. The data rate of IMT-Advanced is 100Mbit/s for high and 1Gbit/s for low mobility. In order to effectively support the high rate of IMT-Advanced system, the RF receiver needs to support higher bandwidth. Because of its advantages such as low power consumption, small size, ease of integration, low cost, non-mirror-frequency problems etc, Zero-IF receiver is of great concern and has been developed rapidly. Therefore, the development of wideband zero-IF receiver has broad prospects and urgent needs.This thesis has completed the development of the wideband Zero-IF RF receiver front-end and tested it. The system's carrier frequency is 3.45GHz and bandwidth is more than 100MHz. First, the thesis introduces the main components and performance indexes of the receiver and analyzes the advantages and disadvantages of three receiver architectures. Then it focuses on the research of the development of the overall system including the selection of architectures, the analysis of the indexes and overall block diagram of achievement. Then device selection and test are made according to the system design, including the circuits design and debugging of some key devices, such as quadrature demodulator, PLL and VGA. Finally, it completes the integration of the system on PCB and tests the key devices and the performance of the overall system. The test results show that the quadrature demodulator has good performance, the PLL has good frequency accuracy and good phase-noise performance, less than -78dBc. The receiver can work properly, whose performance can achieve the design requirement.