| 高线性度低功耗的4阶开关电容低通滤波器 |
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| 引用本文： | 杜大海,熊飞,林云松.高线性度低功耗的4阶开关电容低通滤波器[J].半导体技术,2010,35(12):1222-1225. |
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| 作者姓名： | 杜大海 熊飞 林云松 |
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| 作者单位： | 电子科技大学,自动化工程学院,成都,611731;电子科技大学,自动化工程学院,成都,611731;电子科技大学,自动化工程学院,成都,611731 |
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| 摘 要： | 介绍了一种应用于传感器的高线性度低功耗全差分4阶贝塞尔开关电容滤波器.该滤波器的运算放大器为输出AB类运算放大器,通过AB类运算放大器以及开关电容共模反馈的设计,降低了功耗.在运算放大器中设计了线性跨导环,并通过对电路的拓扑结构进行优化,提高了滤波器的线性度.测试结果表明,在采样频率为1 MHz下,该滤波器的截止频率为10.05 kHz.在输入信号频率为1 kHz,输出信号的总谐波失真(THD)为-89 dB(摆幅为2 V),功耗为5.54 mW,达到了高线性度、低功耗的设计要求.
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| 关 键 词： | 开关电容滤波器 线性度 功耗 AB类运算放大器 总谐波失真 |
High Linearity Low Power Consumption 4-Order S-C Filter |
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| Du Dahai,Xiong Fei,Lin Yunsong.High Linearity Low Power Consumption 4-Order S-C Filter[J].Semiconductor Technology,2010,35(12):1222-1225. |
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| Authors: | Du Dahai Xiong Fei Lin Yunsong |
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| Affiliation: | Du Dahai,Xiong Fei,Lin Yunsong(School of Automation Engineering,University of Electronic Science and Technology,Chengdu 611731,China) |
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| Abstract: | A new approach for designing a kind of high linearity,low power consumption,fully differential fourth-order Bessel switched capacitor filter was presented as a class-AB operational amplifier.Through the designing of class AB op-amp and the S-C common-mode feedback,the power was reduced.By the designing of the topology of the switched-capacitor filter and the trans-linear loop of the op-amp,the linearity of the filter was improved.The measured results show that the THD of the output signal is-89 dB and the p... |
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| Keywords: | switched-capacitor filter linearity power consumption class-AB operational amplifier total harmonic distortion(THD) |
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