以差動差分電流傳輸器為主動元件設計電壓式三階橢圓濾波器

Voltage-Mode Third-Order Elliptic Filter Employing DDCCs

林盈材(Ying-Tsai Lin)

指導教授 ： 張俊明

中原大學/工學院/電機工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200900767

摘要

本論文主要實現一個高頻三階橢圓濾波電路。類比濾波器是以最簡電路和精準的輸出信號為設計重點，故本文以此為目標而提出的設計法，先將三階低通橢圓轉移函數以矩陣模式表示，並使用主動元件特性完成矩陣關係式。電路中的主動元件主要採用特別的電流式主動元件：差分差動電流傳輸器(Differential Difference Current Conveyor，簡稱DDCC)，可將浮接的元件改成接地元件，完成的電路中使用三個主動元件、三個接地電容及四個接地電阻，以完成最簡電路。
設計完成的電路以1M(hz)為操作頻率，並以電路模擬軟H-Spice使用TSMC035μm製程進行電路模擬，在考慮主動元件的追踨誤差後其結果擁有精準的輸出信號，電路操作於更高頻率，並探討追踨誤差以及寄生效應相互關係，與其影響輸出信號不精準的因素，最後利用被動元件對頻率響應的敏感度分析做深入研究，將被動元件值進行理論調整而改善誤差，並使電路在高頻時(100Mhz)仍有精準的輸出信號。

關鍵字

低通濾波器 ； 差動差分電流傳輸器 ； 橢圓濾波器

並列摘要

This brief presents a voltage-mode third-order elliptic filter in the high frequency.
In this circuit design, it is focused on using simplified structure and having accurate output-signal. In this thesis, we offer a method to design the circuit that employing differential difference current conveyor (DDCC),using third-order lowpass transfer function to design the circuit. In this circuit design, we propose a three differential difference current conveyor and three grounded capacitors, and four grounded resistors. In addition, we use the minimum number of active and passive components(three grounded capacitors and four grounded resistors) and consider the non-idea effect. Therefore, we analyze the sensitivity of the passive elements and research in depth.

The simulation of this paper uses H-Spice with TSMC035 process to obtain the results. From the simulation results, it can verify that the circuit enjoys the following advantages: (i) high filter performance (ii) low sensitivity. By using Matlab to testify the theoretical predictions, we can observe the difference between theoretical parts and simulation parts.

並列關鍵字

low-pass filer ； DDCC ； elliptic filter

參考文獻

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