以電流傳輸器為主動元件設計電壓式二階全通濾波器

在現今IC化的時代，所要求電路之頻率越來越高，製程也越做越小，然而電路積體化的同時，導線之間的距離更靠近，也更容易產生寄生效應，導致輸出信號有誤差，為了減少寄生效應的問題發生，所設計出的電路必須符合以最少之節點數目，也就是使用最少主被動元件，以達到精準的輸出濾波信號。由於使用最少主被動元件來設計電路，電路所需消耗功率也相對較少，製成IC時面積小，雜訊減少，且成本較低，故以此目標來設計電路，相信是値得我們深入研究及探討的。本文所提出之電路主要使用二種特別的電流式主動元件：差分差動(Differential Difference Current Conveyor，簡稱DDCC)及第二代完全差動電流傳輸器(Fully Differential second-generation Difference Current Conveyor，簡稱FDCCII)來設計電壓式二階全通濾波電路。以電流式主動元件所設計之電路，已被證明具有較高之頻寬、較大之動態範圍、較大之線性範圍、較小之功率損耗及較簡單之電路結構，且本電路使用了最少的被動元件(二個接地電容及二個接地電阻)，並對電路做非理想分析，探討出影響輸出信號不精準的因素，再利用所求的被動元件對頻率響應的敏感度分析做深入研究，之後再對以電流傳輸器為主動元件之電壓式全通濾波電路做比較。本論文之電路模擬部分是以H-spice電腦軟體進行電路模擬，且使用之製程參數為TSMC035μm，至於理論驗證部份是以MATLAB電腦軟體進行模擬，藉此可比較出理論值與模擬值之間輸出濾波信號的差異。

關鍵字

電流傳輸器；濾波器；全通；電壓式

並列摘要

In the age of IC, circuits will be requested for higher frequency and smaller process. However, while the circuits get integrated, there will be narrower space between wires, and this will result in more parasitic effects and errors of output signals. In order to reduce the parasitic effects, the circuit with fewest numbers of nodes is a must, that is, we should minimize active elements and passive elements to make output signal more precise. And due to the design with minimum numbers of active and passive elements, we will be benefited less power consumption accordingly. Also during the process of producing, the chip area can be smaller, the noise of chips can be lessened, and the cost can be cut down. Hence, such circuit is worth target researching thoroughly. The circuit we talk about on this paper uses two special active elements, namely, differential difference current conveyors(DDCCs) and fully differential current conveyors (FDCCIIs) to design the voltage- mode biquad all-pass filter. It has been verified that the circuits constructed by active current-mode elements have the advantages of higher signal bandwidths, larger dynamic range, greater linearity, less power dissipation and simpler circuit structure. In addition, we use the minimum number of passive components(two grounded capacitors and two grounded resistors) and consider the non-idea effect. Therefore, we analyze the sensitivity of the passive elements and research in depth. Afterward we compare with voltage-mode all-pass filters used current conveyors . The simulation of this paper uses H-spice with TSMC035 process to obtain the results. By using MATLAB to testify the theoretical predictions, we can observe the difference between theoretical parts and simulation parts.

並列關鍵字

current conveyor ； voltage-mode ； filter ； all-pass

參考文獻

[2] B. Wilson,: “Constant bandwidth voltage amplification using current

conveyor”, Int. J. Electron, 1988, 65, (5), pp. 983-988.

[3] B. Wilson, “Recent developments in current conveyors and current- mode

[4] K. C. Smith, and A. Sedra, “The current conveyor - a new circuitbuiding

[5] K. C. Smith, and A. Sedra, “A second-generation current conveyor and it's

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以電流傳輸器為主動元件設計電壓式二階全通濾波器

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