OTA-C與CCCΠ-C雙輸入多輸出高階電流式濾波電路之設計

Design of Current-Mode High-Order OTA-C and CCCII-C DIMOC Filter Structures

余俊源(Chun-Yuan Yu)

指導教授 ： 張俊明

中原大學/工學院/電機工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400146

摘要

高階濾波電路的設計在近幾年逐漸受到研究學者的重視。本論文利用訊號流程圖的方法提出一個新型N階雙輸入多輸出的電流式萬用濾波的電路架構。
這個電路架構除了使用最少的主動、被動元件外，可以無須改變電路架構即可實現所有的濾波信號(註：含低通、帶通、高通、帶拒及全通等濾波信號)。此外，使用單輸入OTA及接地電容器的電路設計讓電路在低功率操作下仍有相當好的高頻響應。
由於CCCΠ與OTA均具有電子可調內部電阻及轉導的特性，因此在實現電路時，我們分別使用這二者主動元件搭配電容來進行驗證。
吾人使用TSMC025製程及±1.25V供給電壓，進行H-spice之模擬。最後吾人得到濾波效果良好、雜訊小、及靈敏度低的模擬結果。

關鍵字

運算轉導放大器 ； 濾波器 ； 電流傳輸器

並列摘要

There is a growing interest of high order filter designs in recent ten years. In this thesis, using signal flow chart, a new current mode nth-order universal (namely, low-pass, band-pass, high-pass, notch, all-pass) filter structure with double inputs and multiple outputs is proposed.

Base upon this configuration, it would have the possessions of using the minimum active (Operational Transconductance Amplifier: OTA or Current-controlled Current Conveyor: CCCⅡ) and passive (Capacitors) components, as well as realizing all filtering functions without changing this configuration. Furthermore, the employment of single–input OTAs and grounded capacitors lead to good high-frequency operations under low supply voltages.

The comparisons between two different types, one is using OTAs and capacitors or (OTA-C) while the other is using CCCⅡs and capacitors or (CCCⅡ-C), are presented by using H-spice simulations, with TSMC025 process and ±1.25V supply voltages, which validate good filtering, small noise and low sensitivity performances.

並列關鍵字

filters ； Current Conveyor ； OTA

參考文獻

[2] Kuo, Benjamin C., “Automatic Control Systems”, Sixth Edition, Englewood Cliffs, N.J. Prentice Hall, 1991.

[3] K. C. Smith and A. Sedra, ‘‘The current conveyor-a new circuit building block,’’ IEEE Proc, vol. 56, pp. 1368-1369, 1968.

[4] B. Wilson, “Constant bandwidth voltage amplification using current conveyor,” Int. J. Electronics, vol. 65, no.5, pp. 983-988, 1988.

[5] A. S. Sedra and K. C. Smith, Microelectronic Circuits, 4th ed., New York: Oxford, 1997.

[6] K. C. Smith and A. Sedra, ‘‘The current conveyor-a new circuit building block,’’ IEEE Proc, vol. 56, pp. 1368-1369, 1968.