| 群时延精确设计的全差分四阶Bessel滤波器 |
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| 引用本文： | 何怡刚,江金光,吴杰.群时延精确设计的全差分四阶Bessel滤波器[J].电子学报,2002,30(2):249-251. |
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| 作者姓名： | 何怡刚 江金光 吴杰 |
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| 作者单位： | 湖南大学电气与信息工程学院,湖南长沙 410082 |
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| 基金项目： | 教育部科学技术研究重点项目 (No.990 90 )，教育部《高等学校骨干教师资助计划》项目 (教文技司 (2 0 0 0 ) 65号文 ) |
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| 摘 要： | 采用MOS管有源电阻,提出了一种全差分R-MOSFET-C四阶Bessel有源低通滤波器,.通过调节工作于亚阈值区的CMOS管的沟道导纳补偿电阻值的大小,能抵消集成电路制造工艺中电阻值的一致偏差,实现Bessel有源滤波器群时延的精确设计.根据无源滤波器的状态方程完成有源滤波器的综合,应用3.3V,0.5μm CMOS工艺完成了群时延大小为0.75μs的四阶Bessel低通滤波器的管极计算机仿真,仿真结果表明所提电路正确有效,适于全集成.
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| 关 键 词： | 差分式 有源滤波器 群时延 低电压低功耗电路 |
| 文章编号： | 0372-2112(2002)02-0249-03 |
| 收稿时间： | 2000-10-10 |
Fully Differential 4th-order Bessel Filter Accurately Designed with Group Delay |
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| HE Yi gang,JIANG Jin guang,WU Jie.Fully Differential 4th-order Bessel Filter Accurately Designed with Group Delay[J].Acta Electronica Sinica,2002,30(2):249-251. |
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| Authors: | HE Yi gang JIANG Jin guang WU Jie |
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| Institution: | College of Electrical and Information Engineering,Hunan University,Changsha,Hunan 410082,China |
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| Abstract: | This paper presents a fully differential R-MOSFET-C 4th-order Bessel active low-pass filter with group delay adjusted by tuning the channel transconductance of CMOS transistors worked in weak inversion region.The tuning can counteract the deviation of resistor in the manufacture of integrated circuit,therefore the group delay of Bessel active filter can be designed and realized accurately .The active filter can be synthesized according to the state equation of passive filter.Computer simulation of 4th-order Bessel low-pass filter with 0.75μs group delay indicate that the proposed circuits are both effective using 3.3V、0.5μm CMOS technology,and suitable for integration. |
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| Keywords: | fully differential active filter group delay low voltage low power circuits |
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