| Summary: | 碩士 === 雲林科技大學 === 電子與資訊工程研究所 === 96 === This thesis studies how to optimize and how to establish the design procedure for voltage-controlled oscillator (VCO) lying in the front end of transceiver. This thesis promotes the good quality of communication by means of decreasing power dissipation and phase noise. Two kinds of chips with different band of voltage-controlled oscillator (VCO) were implemented. From the data between simulations and measurement of these chips shows good agreement.
This thesis presents one low phase noise of the complementary cross-coupled voltage-controlled oscillator (VCO), which oscillates at a range of 3.64∼5.37GHz for WiMAX(World Interoperability for Microwave Access). This VCO utilizes switching capacitor modules in which eight channels are able to be selected. Moreover, MOS varactors are used as fine tuning. The fully integrated VCO provides excellent performance. The bandwidth of frequency is 1.73GHz, that is, the tuning range is 38%. The power dissipation of the core circuit is 13.7mW under 1.8V supply and phase noises all are smaller than -122dBc/Hz at 1MHz offset. This VCO was made by TSMC 0.18μm 1P6M CMOS standard process and the chip area is 0.96 × 0.83 (mm2).
This thesis presents the other low power and low phase noise voltage-controlled oscillator (VCO) for optical communication. This proposed VCO is also made by TSMC 0.18μm 1P6M CMOS standard process. The range of oscillation is from 8.72 to 9.66GHz. At a frequency offset of 1MHz from the 9.46GHz carrier, the measured phase noise is -107.3dBc/Hz. The power dissipation of the core circuit is 6.7mW under 1.8V supply. The bandwidth of frequency is 0.94GHz. The VCO consists of the LC tank, the complementary cross-coupled pair, the memory-reduced tail transistors and output buffers. The chip area is 0.69 × 0.56 (mm2).
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