用于记录生物电位信号的带宽可调放大器。
Bandwidth tunable amplifier for recording biopotential signals.
作者信息
Hwang Sungkil, Aninakwa Kofi, Sonkusale Sameer
机构信息
Nanoscale Integrated Sensors and Circuits Laboratory, Tufts University, Medford, MA 02155, USA.
出版信息
Annu Int Conf IEEE Eng Med Biol Soc. 2010;2010:662-5. doi: 10.1109/IEMBS.2010.5627215.
This paper presents a low noise, low power, bandwidth tunable amplifier for bio-potential signal recording applications. By employing depletion-mode pMOS transistor in diode configuration as a tunable sub pA current source to adjust the resistivity of MOS-Bipolar pseudo-resistor, the bandwidth is adjusted without any need for a separate band-pass filter stage. For high CMRR, PSRR and dynamic range, a fully differential structure is used in the design of the amplifier. The amplifier achieves a midband gain of 39.8dB with a tunable high-pass cutoff frequency ranging from 0.1Hz to 300Hz. The amplifier is fabricated in 0.18εm CMOS process and occupies 0.14mm(2) of chip area. A three electrode ECG measurement is performed using the proposed amplifier to show its feasibility for low power, compact wearable ECG monitoring application.
本文提出了一种用于生物电位信号记录应用的低噪声、低功耗、带宽可调放大器。通过将处于二极管配置的耗尽型pMOS晶体管用作可调亚皮安电流源来调整MOS-双极伪电阻的电阻率，无需任何单独的带通滤波器级即可调整带宽。为了实现高共模抑制比（CMRR）、电源抑制比（PSRR）和动态范围，放大器设计采用了全差分结构。该放大器实现了39.8dB的中频增益，可调高通截止频率范围为0.1Hz至300Hz。该放大器采用0.18μm CMOS工艺制造，芯片面积为0.14mm²。使用所提出的放大器进行了三电极心电图测量，以展示其在低功耗、紧凑可穿戴心电图监测应用中的可行性。
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