Extremely Low-Power Fifth-Order Low-Pass Butterworth Filter

Nattharinee Aupithak, U. Torteanchai, B. Burapattanasiri, S. Lerkvaranyu, F. Khateb, M. Kumngern
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引用次数: 1

Abstract

A fifth-order Butterworth low-pass filter using multiple-input operational transconductance amplifiers (OTAs) is proposed in this paper. It is expressed that the number of OTAs that used for realizing fifth-order low-pass filter can be reduced using multiple-input OTA and results to decrease the power consumption and the active area. N-input OTA can be obtained using multiple-input bulk-driven quasi-floating gate technique. Subthreshold technique is used to achieve extremely low power consumption which can be applied to biomedical systems. The proposed topology is simulated using 0.18 $\mu \text{m}$ standard CMOS process. Simulation results show that the proposed filter has a bandwidth located within 250 Hz, a power consumption of 41 nW and a dynamic range of 61 dB.
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极低功耗五阶低通巴特沃斯滤波器
提出了一种基于多输入运算跨导放大器的五阶巴特沃斯低通滤波器。表示使用多输入OTA和结果可以减少实现五阶低通滤波器所用OTA的数量,从而降低功耗和有源面积。采用多输入块驱动准浮栅技术可获得n输入OTA。采用亚阈值技术实现了极低的功耗,可应用于生物医学系统。采用0.18 $\mu \text{m}$标准CMOS工艺对所提出的拓扑结构进行了仿真。仿真结果表明,该滤波器的带宽在250 Hz以内,功耗为41 nW,动态范围为61 dB。
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