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首页> 外文期刊>Microelectronics journal >A 0.25-V fifth-order Butterworth low-pass filter based on fully differential difference transconductance amplifier architecture
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A 0.25-V fifth-order Butterworth low-pass filter based on fully differential difference transconductance amplifier architecture

机译：基于全差分差分跨导放大器架构的0.25V五阶巴特沃斯低通滤波器

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摘要

This paper presents a fifth-order Butterworth low-pass filter based on the fully differential difference transconductance amplifier (FDDTA) building blocks. At first, the FDDTA has been stated and its operation has been evaluated. Then, a practical implementation using two fully differential inverter-based operational transconductance amplifiers (OTA) was investigated. This particular FDDTA implementation relies on two main features: the intrinsically matched transistors that assure similar transconductances and output conductances for both inverter-based OTA instances; and the inverter-based approach without internal nodes that reduces circuit complexity and power consumption since it requires no supplementary external calibration circuit such as tail current or bias voltage sources. Finally, the filter architecture, which consists of one inverter-based OTA input stage and five FDDTAs in a cascade connection has been evaluated, showing that it presents the expected fifth-order transfer function according to the Butterworth theory. The prototypes, implemented in a 130 nm CMOS process, operate in weak inversion supplied with 0.25 V and consumes 603 nW. Furthermore, they feature a DR of 57 dB in a 100 Hz bandwidth and a maximum THD of 54 dB, therefore, accomplishing specifications that suit for low-frequency applications.
机译：本文提出了一种基于全差分差分跨导放大器（FDDTA）构建模块的五阶巴特沃斯低通滤波器。首先，已经陈述了FDDTA并对其运行进行了评估。然后，研究了使用两个基于全反相器的运算跨导放大器（OTA）的实际实现。这种特殊的FDDTA实现依赖于两个主要特征：本质上匹配的晶体管，可确保两种基于逆变器的OTA实例具有相似的跨导和输出电导；以及无需内部节点的基于逆变器的方法可降低电路复杂性和功耗，因为它不需要诸如尾电流或偏置电压源之类的辅助外部校准电路。最后，对滤波器架构进行了评估，该架构由一个基于逆变器的OTA输入级和五个级联连接的FDDTA组成，表明根据巴特沃思理论，该滤波器架构具有预期的五阶传递函数。这些原型以130 nm CMOS工艺实现，以0.25 V的弱反相工作，功耗为603 nW。此外，它们在100 Hz带宽中具有57 dB的DR和54 dB的最大THD，因此，可满足低频应用的要求。

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