摘 要
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小的晶片面積﹔故利用電流傳輸器(CC)、四端正型電流傳輸器(CFCCIIp)及電流回授放大器（CFA）等電流式主動元件來設計濾波及振盪電路，已受到相當地重視。
本論文將以正型第二代電流傳輸器─CCII+、四端正型電流傳輸器─CFCCIIp及電流回授放大器（CFA）為主動元件，針對先前學者所發表之濾波電路及振盪電路提出三個改進電路。這些改進電路不僅電路結構較簡單，且所使用之主動及被動元件數較少。另外，亦具有低主動元件及被動元件靈敏度之優點。
至於本論文之設計方法，不論在二階濾波電路或振盪電路之設計上，皆以YV=I之矩陣關係式開始，藉由調整矩陣中之元素值，得到我們想要之電路函數，並透過Nullator-Norator之合成技巧，以不同之電流式元件，如CCII+、CFCCIIp、CFA來實現電路。吾人將以上述之設計法則提出三個濾波電路，茲將其簡要分述如下:

1. 以單輸出端之CCII為主動元件設計新的電流式三輸入、單輸出萬用濾波電路
主要優點: 僅使用兩個CCII及兩個電阻器、兩個電容器，且有主動和被動元件的靈敏度均非常小，及兩個電容器全部接地適合電路積體化的優點。
2. 以雙輸出端之CFCCIIps為主動元件設計新的電壓式單輸
入、三輸出之多功濾波電路
主要優點: 僅使用了兩個CFCCIIps、一個單輸出端之CCII-及三個電阻器、兩個電容器即完成bandpass、 lowpass 及Notch之設計﹔具有兩個電容器全部接地適合電路積體化的優點。
3. 以單一個CFA為主動元件設計新的電壓式單輸
入、兩輸出之多功濾波電路
主要優點: 僅使用一個單端正型CFA、三個電阻器、兩個電容器即完成bandpass、 lowpass濾波電路的設計，除為最精簡電路外並具有兩個電容器全部接地適合電路積體化的優點。
此外，吾人以PSpice及Matlab模擬方式來驗證電路之可行性，其結果均與理論值相當接近。

Abstract
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. Therefore, the circuits which are designed by employing active current-mode elements have been received considerable attention.
We apply the nullator-norator approach to propose three novel circuits in the thesis,by employing active current-mode elements such as CCII+s, CFCCIIps and the CFA. The propose circuits offer the following advantageous features : fewer number of active and passive elements, employment of two grounded capacitors ideal for integration and low active and passive sensitivities. On the design of the biquadratic filter, we propose one novel universal current-mode filter and two multifunction voltage-mode filters which are :

1. Novel universal current-mode filter with three inputs and single output employing single-output CCIIs.
Main advantages: The proposed circuit uses only two CCIIs, two resistors and two capacitors. It does not only simplifies the circuit structure before but also enjoys the low active and passive sensitivities and the employment of two grounded capacitors ideal for integration.
2. Voltage-mode multifunction filter with single input and three outputs employing CFCCIIps.
Main advantages: The proposed circuit employs fewer components, namely , three CCIIs, three resistors and two capacitors, can simultaneously realise bandpass lowpass and notch filter signals, employs two grounded capacitors ideal for integration.
3. Voltage-mode multifunction filter with single input and two outputs employing single CFA.
Main advantages: The proposed circuit uses only one CFA, three resistors and two capacitors. It can simultaneously realise bandpass and lowpass filter signals, and enjoys the employment of two grounded capacitors ideal for integration.
Moreover, experimental or simulation results agree well with the theoretical predictions.

目錄
第一章 緒論..................................1-1
第二章 電流式主動元件介紹....................2-1
2-1 Nullor model.............................2-1
2-2電流傳輸器................................2-3
2-3雙輸出端的第二代電流傳輸器................2-8
2-4單增益隨耦器…………………………..………….2-12
2-5電流回授放大器（CFA）………………………….2-15
第三章 以單輸出端CCII設計電流式萬用濾波電路...3-1
3-1 先前學者電路.............................3-1
3-2 本文所提電路.............................3-3
3-2-1電路的設計..............................3-3
3-2-2電路的實現..............................3-4
3-2-3靈敏度分析及模擬結果....................3-5
3-2-4電路比較…………………………………………3-6
第四章 以CFCCIIp設計電壓式多功濾波電路.......4-1
4-1 先前學者電路..............................4-2
4-2 本文所提電路.............................4-6
4-2-1電路的設計..............................4-7
4-2-2電路的實現..............................4-8
4-2-3靈敏度分析及模擬結果....................4-9
4-2-4電路比較……………………………………....4-10
第五章 以CFA設計電壓式多功濾波電路...........5-1
5-1 先前學者電路.............................5-2
5-2本文所提電路..............................5-3
5-2-1電路的設計..............................5-3
5-2-2電路的實現..............................5-4
5-2-3靈敏度分析及模擬結果....................5-5
5-2-4電路比較................................5-6
第六章 結論與未來研究方向....................6-1
6-1 結論.....................................6-1
6-2 未來研究方向.............................6-2
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