Outline
- Abstract
- 1. Introduction
- 2. Principle of Operation
- 2.1. Active Building Block: Lt1228
- 3. Effect of Parasitic Elements
- 4. Experimental Results
- 5. Conclusion
- Conflicts of Interest
- Acknowledgments
- References
رئوس مطالب
- 1. معرفی
- 2. اصول عملکرد
- 3. تاثیر عناصر پارازیتی
- 4. نتایج آزمایش
- 5. نتیجه گیری
Abstract
This paper presents a second-order voltage-mode filter with three inputs and single-output voltage using single commercially available IC, one resistor, and two capacitors. The used commercially available IC, called LT1228, is manufactured by Linear Technology Corporation. The proposed filter is based on parallel RLC circuit. The filter provides five output filter responses, namely, band-pass (BP), band-reject (BR), low-pass (LP), high-pass (HP), and all-pass (AP) functions. The selection of each filter response can be done without the requirement of active and passive component matching condition. Furthermore, the natural frequency and quality factor are electronically controlled. Besides, the nonideal case is also investigated. The output voltage node exhibits low impedance. The experimental results can validate the theoretical analyses.
Conclusions
In this contribution, the three-input single-output voltage-mode filter is presented. The proposed filter uses only single commercially available IC, LT1228 as active element. The natural frequency and quality factor can be tuned electronically by changing the bias current of LT1228. The selection of output filter response can be done without requirement of the matching condition of passive and active component. Also, the selection of all-pass filter response can be done without the requirement of double gain amplifier. Using only single commercially available IC, the proposed filter is suitable for off-the-shelf implementation. The workability of the proposed filter is demonstrated by experimental results.