Design and Implementation of High Q Analog IF Bandpass Filter Based on Gm-C

DUAN Chong; LI Wei-min; WEN Wu

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Design and Implementation of High Q Analog IF Bandpass Filter Based on Gm-C

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- Design and Implementation of High Q Analog IF Bandpass Filter Based on Gm-C
- Vol. 29, Issue 8, Pages: 74-77(2012)
- 作者机构：
  
  北京微电子技术研究所机构,北京,100074
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2012
- 稿件说明：
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段冲, 李卫民, 文武. 一种基于Gm-C的高Q值模拟中频带通滤波器设计与实现[J]. 微电子学与计算机, 2012, 29(8): 74-77.

DUAN Chong, LI Wei-min, WEN Wu. Design and Implementation of High Q Analog IF Bandpass Filter Based on Gm-C[J]. 2012, 29(8): 74-77.
段冲, 李卫民, 文武. 一种基于Gm-C的高Q值模拟中频带通滤波器设计与实现[J]. 微电子学与计算机, 2012, 29(8): 74-77. DOI：

DUAN Chong, LI Wei-min, WEN Wu. Design and Implementation of High Q Analog IF Bandpass Filter Based on Gm-C[J]. 2012, 29(8): 74-77. DOI：

摘要

设计并实现了一种基于Gm-C二次节(Biquad)结构的6阶切比雪夫Ⅰ型模拟中频带通滤波器

中心频率为46MHz

带宽为2.046MHz.其中Biquad结构中加入了负阻抗单元

增加输出阻抗

实现滤波器的高Q值(品质因数).跨导放大器(Operational transconductance amplifier

OTA)单元使用源极负反馈技术

优化了OTA的线性性能.整个滤波器电路采用0.35μm CMOS工艺实现.经过仿真验证

滤波器的通带纹波是2.704dB

1.5倍带宽处衰减大于21dB.在3.3V电源电压情况下

滤波器的总电流消耗为8.87mA.

Abstract

A 46 MHz centre frequency

2.046 MHz bandwidth 6th order Chebyshe-v-Ⅰbandpass integrated filter using a biquad Gm-C structure is designed and implemented.Negative resistance cells are used in the biquad structure to obtain high Q of the filter.The OTA has a high linearity with source degeneration technique using MOS resistors.The whole filter circuit is designed and simulated in 0.35 μm CMOS process.The pass-band ripple of the filter is 2.704 dB and the 1.5 bandwidth attenuation is higher than 21 dB.The total dc current consumption is 8.87 mA @ 3.3 V supply.

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