中原大學電機工程學系
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以運算轉阻放大器為主動元件設計電壓式三階橢圓濾波電路
指導老師:張俊明   組長:林峻弘   組員:羅宇喬、范直瑄、詹廷鈞、劉喜鳴
目前在期刊上發表之電路,大部分所使用的主動元件為運算轉導放大器( Operational Transconductance Amplifier ),運算轉導放大器的特性是輸入端之電壓差值乘上一電導後會得到一電流值,而本專題電路所使用的主動元件為運算轉阻放大器( Operational Transresistance Amplifier ),其基本特性為輸入端電流的差值乘上電阻值會在輸出得到一電壓值,與運算轉導放大器之特性正好相對偶,且運算轉阻放大器的輸入端為虛接地,故寄生效應只有運算轉導放大器的一半,因此我們選用運算轉阻放大器做為本專題之電路的主動元件。
本專題是以運算轉阻放大器為主動元件並以節點分析設計法( Design of Nodal Analytical Method )來設計一個電壓式三階低通橢圓濾波電路,共使用了三個運算轉阻放大器、三個電容及七個電阻。在三階濾波器中需要使用的最少電容為三顆,所以此電路採用了最少電容的設計。
此電路以H-SPICE電腦軟體進行電路模擬,所用之製程參數為TSMC035μm,並且在模擬之後以MatLab電腦軟體進行理論值的驗證。由於輸入端的寄生效應低的關係,所以我們針對電阻敏感度的傾向來調整電阻值,將電阻經過調整過後其輸出訊號的準確度確實有明顯的提高,之後將電阻值整數化以利於整體電路可以實體化。
In recent years, most of active component of circuits using Operational Transconductance Amplifier( OTA ) was announced on the famous international journals, the property of Operational Transconductance Amplifier is that the product of difference of voltage at input terminal and conductance would get a current value, and the active component of the circuit in this paper is Operational Transresistance Amplifier( OTRA ), which property is that the product of difference of current at input terminal and resistance would get a voltage value, so we can found that the property of OTA and OTRA are duality. Besides, the input terminal of OTRA is virtual grounded, so the paarasitic effect is only half of OTA. That is why we choice OTRA to be the active component of this paper.
This paper is mainly to realize a Voltage-Mode Third-Order Elliptic Filter structure employing Operational Transresistance Amplifier with Design of Nodal Analytical Method, the structure is totally using 3 OTRAs、3 capacitors and 7 resistors. The minimum capacitors used on the third order filter is three, so this design of capacitor of circuit is minimum.
The simulation of this paper uses H-SPICE with TSMC035μm process, and we use MatLab to verify the result and theoretical value. Because of the parasitic effect of input terminal is low,we are directed against the tendency of sensitivity of capacitor to tune the capacitance, and the accruacy of output signal is obviously improved when tuning the resistance. It is easy to have the circuit be realized after we make the resistance integer, the accuracy of ouput signal is accurate.
我們決定將壓電陶瓷晶片和鞋子做結合。
   
 
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