IEEE Trans Biomed Circuits Syst. 2007 Sep;1(3):163-71. doi: 10.1109/TBCAS.2007.913129.
This paper presents a nanopower programmable bandpass filter suitable to process biomedical signals. The filter proves to be very robust to mismatch and process variations even when it has been implemented using MOS transistors biased in the weak inversion region. The paper analyses design issues associated to matching and process variations for the chosen filter topology and constituent transconductor block. The design equations justify the choice of both when the main constraints are robustness and power. The sixth order, bandpass filter prototype consumes 70 nW of power, with a dynamic range greater than 47 dB and operates at 1-V power supply. The filter was designed as part of a wearable breathing detector but its wide programmability range makes it suitable for many other biomedical sensor interfaces that require steep low frequency rejection band as well as ultralow power and low voltage operation.
本文提出了一种适用于处理生物医学信号的纳米功率可编程带通滤波器。该滤波器即使使用工作在弱反型区的 MOS 晶体管实现，也非常稳健，能够抵抗失配和工艺变化的影响。本文分析了所选滤波器拓扑结构和构成跨导模块的匹配和工艺变化设计问题。在考虑稳健性和功率的主要约束条件下，设计方程证明了这两个选择的合理性。该六阶带通滤波器原型消耗 70nW 的功率，具有大于 47dB 的动态范围，工作在 1V 的电源电压下。该滤波器是作为可穿戴呼吸探测器的一部分设计的，但它的宽可编程范围使其适用于许多其他需要陡峭低频抑制带以及超低功率和低电压工作的生物医学传感器接口。
