| Summary: | 碩士 === 崑山科技大學 === 電子工程研究所 === 95 === In the wireless communication system of Taiwan, develops already ripely so far, in the product market of communication with competition is intense, manufacturers have priority to consider from the stability and cost of quality invariably. So the products of the commonability seem extremely important when being developed. Direct against the little size, low power consumption, low cost, combination system and efficiency of the production of the wireless communication products, the present trend is developing with CMOS technology. In this thesis, mainly of low power consumption Voltage Controlled Oscillator with design and realizing are our research policy. By the circuit design, make VCOs work in the ISM of 2.4GHz and accord with IEEE 802.11b/g protocol standard. The circuit utilizes the Current Reused Structure with LC tank, and manages to improve this structure the output not symmetry of fault. We increased the parallel resistance on input and output port in order to reduce the difference phase and make the output signal more symmetrical. The VCOs circuit has been designed using TSMC and UMC 0.18um RF CMOS processes . These Chips has been fabricated and measured by the support of CIC in Taiwan. After the comparison with simulated and measured, we proved our design theory accuracy and obtain the measured and simulated results are approximate. The communication system is developed so fast, and the frequency of utilization is more higher, the Ultra Wide-Band will become the communication mainstream in the future, and it is widest band to use 3GHz ~ 5GHz frequency applications, To face the communication application in the future, it designs highly band to be inevitable trend. In the end, we also design a differentially cross-coupled structure and used switched capacitor achieved the 3GHz ~ 5GHz VCO of Ultra Wide-Band standard.
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