2.4/5.2GHz雙頻段壓控振盪器

2.4/5.2 GHz Dual-band Voltage-Controlled Oscillator

林志鵬(Zhi-peng Lin)

指導教授 ： 王瑞祿 ； 蔡國瑞

崑山科技大學/工程學院/電子工程研究所/碩士(2005年)

摘要

近年來市面上無線區域網路的應用產品已被廣泛使用，為了節省成本並縮減體積，一個能同時滿足兩個標準以上的多模態之接收系統是必要的，因此雙頻元件發展就顯得格外重要。為了能滿足市場對於無線通訊產品的尺寸小、低消耗功率、低成本、高整合性的需求，利用CMOS技術來設計雙頻射頻收發機成為一必然的趨勢。
本論文主要在研究應用於無線區域網路之雙頻VCO的設計與實現技術，透過設計使得VCO工作在2.4GHz及5.2GHz兩個操作頻段，並且同時符合IEEE 802.11a及IEEE 802.11b兩協定之規範。本論文中，使用交錯偶合的差動架構和LC共振電路，並以切換式電感來取代共振器內的電感，以達成雙頻段振盪的效果。
電路之設計是以TSMC所提供的0.18um CMOS製程之model進行模擬，並透過CIC之申請下線來完成晶片之製作，並完成晶片的量測，得到量測值與模擬值相近。由模擬可知控制MOS可變電容的body端電位，可增加頻率調諧範圍，減少製程變異所產生的影響。

關鍵字

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並列摘要

In recent years, the application products of the wireless local network have already been used extensively on the market. To save cost and reduce volume, concurrent multi-band receivers which can satisfy at least two standards is essential. Hence, the development of dual-band component seems extremely important. The wireless products with the smaller size, lower power consumption, lower cost and high integration are the major stream of the current market. Hence, it has become an inevitable trend to use the CMOS technologies to implement the RF transceivers.
In this thesis, we have studied the techniques of design and implementation of the dual-band VCO which are applied to the WLAN systems. It is in both 2.4GHz and 5.2GHz frequency bands. The dual-band VCO conforms to the protocols of the IEEE 802.11a and IEEE 802.11b systems. In this thesis, a differentially cross-coupled structure and LC resonance circuits are used to implement the dual-band functions. The inductors of the traditional LC resonator are replaced with switched inductors in order to arrive at the performances of dual-band oscillation.
The studied circuits have been designed under the TSMC 0.18um CMOS processes. These Chips have also been fabricated and measured by the support of CIC in Taiwan. The measured and simulated results are approximate. We study also how to increase the tuning range in order to mitigate the influence of the fabrication variation on the performance by simulation. It is obvious that the tuning range can be increased by biasing bodies of MOS varactors.

並列關鍵字

none

參考文獻

[4] Yim SM, O KK. “Demonstration of a switched resonator concept in a dual-band monolithic CMOS LC-tuned VCO.” IEEE Custom Integrated Circuits Conf Proc, 2001. p. 205–8.

[5] Chien-Chih Ho, Chin-Wei Kuo, Chao-Chih Hsiao, Yi-Jen Chan “A fully integrated dual-band VCO by 0.18 μm CMOS technologies ”,in 2003 Elsevier Ltd.

[7] Zhenbiao Li and Kenneth O ,”A 900-MHz 1.5-V CMOS Voltage-Controlled Oscillator Using Switched Resonators With a Wide Tuning Range”, IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, VOL. 13, NO. 4, APRIL 2003

[8] C.-M. Hung and Kenneth K. O ,” A Packaged 1.1-GHz CMOS VCO with Phase Noise of ?126 dBc/Hz at a 600-kHz Offset”, IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 35, NO. 1, JANUARY 2000

[9] Ali Hajimiri, and Thomas H. Lee ,“A General Theory of Phase Noise in Electrical Oscillators.”, IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 33, NO. 2, FEBRUARY 1998