使用兩個電流回授放大器設計之四輸入一輸出的電壓模式萬用二階濾波器

Voltage-Mode Universal Biquadratic Filter With Four Inputs And One Output using Two Current Feedback Amplifiers

曹佑慈(YU-TZU TSAO)

指導教授 ： 洪君維

中原大學/電機資訊學院/電子工程研究所/碩士(2018年)

https://doi.org/10.6840/cycu201800272

摘要

從主動元件發展以來，電流式主動元件已經成為主流，它可以有效的降低成本與功耗，並且有良好的增益頻寬積等優點。本篇論文主要的研究對象是以電流式主動元件設計之類比通用濾波器。
本篇提出一個萬用電壓模式二階濾波器，使用兩個電流回授放大器與三個電阻兩個電容，完成四輸入一輸出的電壓式萬用二階濾波器。可以藉由改變輸入電壓點，且在不改變電路結構也不需增加輸入電壓反相器的形況下，完成低通、高通、帶通、反相帶通、帶阻、全通六種濾波器，且除了全通響應以外皆不需要阻抗匹配，電路輸出阻抗低，適合串接電路，方便形成更高階的濾波器。
現今電流回授放大器已經商用IC（AD844）化，所以本篇論文為了驗證電路的正確性，進行理想、模擬與實驗的比對，模擬以HSPICE進行，得到的實驗與模擬結果跟理論相符。

關鍵字

電流回授放大器 ； 類比濾波器 ； 萬用二階濾波器 ； 主動濾波器

並列摘要

Since the development of active devices, current mode active devices have become the mainstream, which can effectively reduce costs and power consumption, and has a good gain bandwidth product and other advantages. The main research of this dissertation is a voltage-mode universal biquadratic filter that designed with current mode active elements.
This article proposes a voltage mode universal biquadratic filter that uses two current feedback amplifiers, three resistors and two capacitors to complete a four-input, one-output voltage mode universal biquadratic filter. It is possible to complete six kinds (low-pass, high-pass, band-pass, inverting bandpass, notch, and all-pass) filters by changing the input voltage terminals and without changing the circuit structure or need one more active for inverting voltage input. The all-pass response that requires impedance matching condition. The circuit has a low output impedance, it is suitable for series connection and facilitates the formation of higher-order filters.
Currently, current feedback amplifiers have been commercialized in IC AD844. To verify the correctness of the proposed circuit, the experiments and simulations are done. They are all in accordance with the theory.

並列關鍵字

current feedback amplifiers ； universal Biquadratic filter ； active filter

參考文獻

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