近來,結合GSM以及WLAN操作的多標準多頻帶的收發機已經獲得高度的關注。對於此類的收發機，在直接轉頻架構中整合可重組的射頻電路區塊是達到低成本且低功率目標的有效方式。若使用直接轉頻架構，則我們需要有不同頻帶的LO訊號。最簡單而直接的方式，係整合兩顆分別為GSM及WLAN操作頻率的壓控振盪器(VCO)電路來完成。然而，晶圓面積的消耗將導致成本的增加。為了成本上的考量，發展單顆並能提供頻率以滿足GSM (1.8 GHz)以及WLAN (2.4 GHz)的頻帶的可重組之VCO電路的重要性已日益增高。
在本論文中的可重組之VCO電路係使用TSMC 0.18 μm 1P6M RF CMOS製程製作。利用可切換式電容陣列來提供一個較寬的可調變頻率範圍而不會劣化相位雜訊；利用可切換式電感結構來提供可切換至GSM或WLAN頻帶的中心振盪頻率。在電感結構方面則是使用本實驗室所研製的一個新型可切換式差動電感。利用此新型電感，可大幅的減少此VCO電路的面積消耗，降低IC製造成本。
本論文的新穎性有二:首先，我們提出一新型可切換式差動電感的完全整合，使得可重組之雙頻帶VCO電路的晶片面積消耗得以縮小。再者，實現整合此雙頻之VCO電路於GSM與WLAN共存系統的可能性。

Recently, a multi-standard / multi-band terminal which combines the operation of GSM with WLAN has gained a lot of interest. The effective way to achieve the targets of low cost and low power for such terminals is to integrate the re-configurable RF blocks in direct conversion architecture. By using a direct conversion structure, we need different LO signals associated with the operation bands. The simplest and direct way is to integrate two VCO’s for GSM and WLAN respectively. However, the chip area consumption will be increased and thus the cost increases. For the cost down reason, it becomes important to develop a re-configurable VCO circuit which can provide the frequency either in the GSM (1.8 GHz) band or in the WLAN (2.4 GHz) band.
In this thesis, we try to develop such a re-configurable VCO circuit by using TSMC 0.18 um 1P6M RF CMOS technology. By way of switching the capacitance array, the tuning range becomes wider without the degradation of phase noise. By way of switching the inductor, the center frequency of oscillation can be either in GSM band or in WLAN band. By applying the newly proposed switchable differential inductor developed from our laboratory, the integrated VCO circuit can possess the possibly smallest chip area. Therefore, the area-cost-efficiency can be achieved.
The innovatory contributions of this thesis are as followed: The first, we propose the full integration of a new kind of switchable differential inductor to reduce the chip area consumption of a re-configurable dual-band VCO. The second, we confirm the integration possibility of such VCO circuit to a GSM and WLAN co-existence system.

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