Local Oscillator’s Design And Implementation Which Bases On Broadband Multi-channel Microwave Transceiver

With the rapid development of broadband data users and mobile users, as well as trends of the development from narrowband voice communication to broadband of high-speed data communications, how to improve the network capacity in a certain spectrum resources, how to enhance the performance of network coverage at a certain number of base stations, become an important problem in the future communication network construction to considerate. We need extremely high spectral efficiency technologies to achieve high-speed transmission of integrated business across a limited spectrum resources. MIMO-OFDM technology will significantly increase the capacity of a wireless system, so that future high-speed wireless multimedia communication possible.Future broadband wireless communication system needs to support a high-speed transmission which has put forward higher requirements of RF system design, leading to broadband radio systems. In broadband RF systems, need to achieve high sensitivity and high stability of the transceiver in order to meet the requirements of broadband communications. The broadband multi-channel microwave transceiver mainly integrated high linearity power amplifier, dynamic range broadband high linearity receiver front-end, high consistency multi-RF channel, high stability of the local oscillator, wideband low noise amplifiers and other key technology that can meet the needs of broadband RF systems. The main design content of this paper is high stability of the local oscillator.According to analysis the needs MIMO-OFDM system design requirements of the local oscillator,the multi-channel output local oscillator t is designed with high stability, low phase noise and high consistency. The local oscillator operates in the 2.4GHz band. It mainly includes three part of the frequency source circuit, amplifier and 8-way splitter. In the thesis, each part of the circuit of the design process is described in detail,and test results for is analyzed. The design is to deliver its technical indicators are in line with the system requirements of the local oscillator. With this design provides for broadband multi-channel microwave transceiver high consistency, high reliability multi-output local oscillator, successfully applied RF broadband multi-antenna systems, providing a stable and reliable multi-antenna system RF front-end equipment.Paper introduces the background of the subject and application scenarios at the first, and put forward the design requirements, then discusses the main component unit frequency source. The paper analyzes the technology of Frequency synthesis, and phase-locked loop in details, and finalize the design ideas frequency source. According to the design ideas, the paper describes how to select the appropriate chips, how to design schematics and PCB plans, and gives the final test results. Then the amplifier circuit were discussed, introduced the design requirements of amplifier circuit and amp selection, and describes the design process of the cricuits, and finally gives test results. Then the paper discusses about 8-way splitter design. It was designed by ADS simulation software. Across the software, we complete the 8-way splitter chematic and layout design.Finally, all of the local oscillator circuits is bing in an integrated circuit design. According to the needs of the broadband multi-channel microwave transceiver,designs the shape of the structure, and tests the entire module and analysis the results. At last, the thesis demonstrated the effect of the local oscillater which applied in broadband multi-channel microwave transceiver.