| Summary: | 碩士 === 國立臺灣大學 === 電信工程學研究所 === 95 === A low phase noise VCO is indispensable in modern communication system. The portable and universal wireless applications drive us to investigate low power consumption and low cost system. Therefore, to design a low phase noise VCO with low power consumption and low cost is always a challenge.
The goal of the thesis is to design and implement VCOs in microwave and millimeter-wave region using CMOS technology. The thesis consists of three parts. The first part introduces the basic of phase noise and discusses the theory of transformer-based LC-tank VCOs. A new topology of transformer-based complementary VCO which achieve a phase noise of -106 dBc/Hz at 1-MHz offset at 21 GHz with a low power consumption of 9.6 mW and a compact chip size of 0.164 mm2 is designed and implemented in this part.
In the next part, the theory and advantages of ring oscillator and multi-push VCO are introduced, respectively, and a ring-based triple-push VCO with extremely wide tuning range is proposed. A tradition ring oscillator and triple-push topology are combined to extend the tuning range. The oscillation frequency can be reached from 0.2 GHz to 32.8 GHz with a miniature chip size of 0.095 mm2.
Another transformer-based topology, transformer feedback, is analyzed and implemented in 20 GHz in the third part. The transformer feedback VCO achieves a phase noise of -107 dBc/Hz at 1-MHz offset with a power consumption of 16 mW and a compact chip size of 0.154 mm2. The basics and application of QVCO is discussed later. Then a transformer feedback QVCO is designed and fabricated by TSMC 0.18-
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