應用於超寬頻系統之頻帶切換壓控振盪器

A BAND-SWITCHING VCO FOR UWB SYSTEM

周孟毅(Meng-I Chou)

指導教授 ： 蔡明傑

大同大學/電機資訊學院/電機工程學系所/碩士(2006年)

摘要

本篇論文旨在設計一顆應用於IEEE 802.15.3a UWB系統中的壓控振盪器，分別為差動式和正交式的壓控振盪器。使用NMOS開關式電容和開關式電感來達到寬頻的目標。前者採用PMOS cross-coupled為主動埠，並在LC tank上做設計，在模擬與Layout過程中，皆採用TSMC 0.18μm 1P6M CMOS model來完成，構成3.5~4.5GHz和5.8~8GHz的頻帶。低頻帶之相位雜訊介於-105.512~ -111.958dBc/Hz @1MHz offset；高頻帶之相位雜訊介於 -94.686~ -104.852dBc/Hz @1MHz offset。

後者是採用背閘極的觀念與開關式的LC tank，來完成超寬頻的需求，且其功率消耗12.27mW低於以往之設計。低頻帶的振盪頻率為3.9~4.8GHz而相位雜訊介於-108.388~ -115.672dBc/Hz @1MHz offset；高頻帶則為6.2~8.1GHz而相位雜訊介於-92.878~ -108.385dBc/Hz @1MHz offset。

關鍵字

超寬頻 ； 壓控振盪器 ； 相位雜訊

並列摘要

This thesis mainly focuses on the design of VCO for IEEE 802.15.3a UWB system and there are two kinds of oscillators those are the differential and quadrature VCOs respectively. They use NMOS switched-capacitor and switched-inductor to reach wideband purpose. The former adopts PMOS cross-coupled for active device and design on LC tank especially. In simulation layout course, all adopt TSMC 0.18μm 1P6M CMOS model to finish. We achieve the frequency band for 3.5~4.5GHz and 5.8~8GHz. The phase noise of low-frequency is between -105.512 and -111.958dBc/Hz @1MHz offset, the phase noise of high-frequency is between -94.686 and -104.852dBc/Hz @1MHz offset.

The latter utilizes the back-gate concept and switch tank to accord with the UWB demand. Hence, its power consumption is 12.27mW lower than the past design. The oscillator frequency at low band is 3.9~4.8GHz and its phase noise is between -108.388~ -115.672dBc/Hz @1MHz offset, the oscillator frequency at high band is 6.2~8.1GHz and its phase noise of high-frequency is between -92.878 and -108.385dBc/Hz @1MHz offset.

並列關鍵字

UWB ； wideband ； phase noise ； tuning range ； vco

參考文獻

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