广西师范大学学报（自然科学版） ›› 2018, Vol. 36 ›› Issue (3): 1-8.doi: 10.16088/j.issn.1001-6600.2018.03.001

• 论文 •    下一篇

带宽可调带阻滤波器的设计

刘国伦, 宋树祥*, 岑明灿, 李桂琴, 谢丽娜   

  1. 广西师范大学电子工程学院,广西桂林541004
  • 收稿日期:2018-01-11 出版日期:2018-07-17 发布日期:2018-07-17
  • 通讯作者: 宋树祥(1970—),男,湖南双峰人,广西师范大学教授,博士。 E-mail:songshuxiang@mailbox.gxnu.edu.cn
  • 基金资助:
    国家自然科学基金(61361011); 广西自然科学基金(2017GXNSFAA198363)

Design of Bandwidth Tunable Band-Stop Filter

LIU Guolun, SONG Shuxiang*, CEN Mingcan, LI Guiqin, XIE Lina   

  1. College of Electronic Engineering,Guangxi Normal University,Guilin Guangxi 541004,China
  • Received:2018-01-11 Online:2018-07-17 Published:2018-07-17

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摘要： 传统的带阻滤波器大多是采用全无源元件实现,存在阻带带宽不易调节、电感元件占芯片面积大等问题。本文采用TSMC 180 nm CMOS工艺,提出一种基于N通道陷波滤波器的带宽可调带阻滤波器,该电路由2个二阶N通道陷波滤波器和跨导单元构成,通过跨导单元使两通道的频率相对总输出频率向上和向下偏移,实现了滤波器的阻带带宽可调谐。在1.8 V的供电电压下,采用Cadence Spectre RF仿真,结果表明:滤波器的增益大于-2 dB,陷波频率可调范围为0.3~1.2 GHz,阻带带宽可调范围为20~48 MHz,阻带抑制为12 dB,频偏为150 MHz时,IIP3为9.8 dBm,FN为3.5~6.5 dB。该带阻滤波器不仅实现了带宽可调谐的功能,而且电路结构简单,易于全集成,电路整体性能得到提高,为多标准、多频率的无线电应用提供了参考。

关键词: 带阻滤波器, 带宽可调, 跨导单元, CMOS技术, 陷波频率可调

Abstract: Most of the traditional band-stop filters are realized by all-passive components, and there are problems such as the difficulty of adjusting the bandwidth of the stop-band and the large area of the inductor. Using TSMC 180 nm CMOS technology, this paper proposes an adjustable-bandwidth band-stop filter based on an N-path notch filter. The circuit consists of two second-order N-path notch filters and a transconductance cell. The frequency of the two channels is shifted upward and downward with respect to the total output frequency to achieve a tunable stop-band bandwidth of the filter. At 1.8 V supply voltage, using Cadence Spectre RF simulation, the results show that the filter gain is greater than -2 dB,the notch frequency is adjustable from 0.3 GHz to 1.2 GHz, the stop-band bandwidth is adjustable from 20 MHz to 48 MHz, and stop-band rejection is 12 dB. When the frequency deviation is 150 MHz, IIP3 is 9.8 dBm, FN is 3.5 to 6.5 dB. The proposed band-stop filter not only achieves a bandwidth-tunable function, is easy to integrate with a simple circuit structure, but also improves the overall circuit performance which provides a useful solution for multi-standard, multi-frequency radio applications.

Key words: band-stop filters, tunable bandwidth, transconductance cell, CMOS technology, tunable notch frequency

中图分类号: 

  • TN713
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