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Implementation of a Monolithic Single Proof-Mass Tri-Axis Accelerometer Using CMOS-MEMS Technique

机译:利用CMOS-MEMS技术实现单片单质量三轴加速度计

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This paper presents a novel single proof-mass tri-axis capacitive type complementary metal oxide semiconductor-microelectromechanical system accelerometer to reduce the footprint of the chip. A serpentine out-of-plane (Z-axis) spring is designed to reduce cross-axis sensitivity. The tri-axis accelerometer has been successfully implemented using the TSMC 2P4M process and in-house postprocessing. The die size of this accelerometer chip containing the MEMS structure and sensing circuits is 1.78 $times$ 1.38 mm, a reduction of nearly 50% in chip size. Within the measurement range of 0.8 $sim$ 6G, the tri-axis accelerometer sensitivities (nonlinearity) of each direction are 0.53 mV/G (2.64%) for the X-axis, 0.28 mV/G (3.15%) for the Y-axis, and 0.2 mV/G (3.36%) for the Z-axis, respectively. In addition, the cross-axis sensitivities of these three axes range from 1% to 8.3% for the same measurement range. The noise floors in each direction are 120 mG/rtHz for the X-axis, 271 mG/rtHz for the Y-axis, and 357 mG/rtHz for the Z-axis.
机译:本文提出了一种新颖的单质量三轴电容型互补金属氧化物半导体-微机电系统加速度计,以减少芯片的占位面积。蛇形平面外(Z轴)弹簧旨在降低横轴灵敏度。三轴加速度计已使用TSMC 2P4M工艺和内部后处理成功实现。这种包含MEMS结构和传感电路的加速度计芯片的芯片尺寸为1.78 x 1.38毫米,芯片尺寸减少了近50%。在测量范围0.8 $ sim $ 6G中,每个方向的三轴加速度计灵敏度(非线性)对于X轴为0.53 mV / G(2.64%),对于Y-轴为0.28 mV / G(3.15%)轴,Z轴分别为0.2 mV / G(3.36%)。此外,对于相同的测量范围,这三个轴的跨轴灵敏度范围为1%至8.3%。 X轴每个方向的本底噪声为120 mG / rtHz,Y轴为271 mG / rtHz,Z轴为357 mG / rtHz。

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