← 返回 JSSC 论文列表JSSC 2024第3期mm-Wave0.18µm CMOS
A Low-Power Wide-Bandwidth Three-Axis MEMS Accelerometer ASIC Using Beyond-Reson
首款采用超谐振频率传感技术的三轴MEMS加速度计ASIC,扩展带宽至4kHz和8kHz。
4kHz, 25µg/√Hz, ±8g, 375µA; 8kHz, 59µg/√Hz, ±30g, 550µA
MEMS加速度计超谐振频率宽带宽低功耗ASIC
▸创新点1:超谐振频率传感技术(方法创新)。该技术首次在加速度计中应用,通过数字化和均衡化MEMS传感器的全响应(包括谐振频率),显著扩展了带宽,使加速度计能够捕捉更高频率的信号,如声波和振动。
▸创新点2:双信号路径设计(系统创新)。该设计包含三条16位高性能信号路径和一条共享的12位低功耗信号路径,分别用于高频信号(如声波、振动)和低频信号(如温度、运动)的同步检测,实现了高性能与低功耗的平衡。
▸创新点3:全传感器响应数字化与均衡(方法创新)。通过数字化和均衡化MEMS传感器的全响应,包括谐振频率,补偿了传递函数的偏差,将偏差从4.6 dB和8.9 dB降低到±0.56 dB和±0.52 dB,显著提高了测量精度。
▸创新点4:低功耗高性能集成(电路创新)。采用0.18-µm CMOS技术,实现了低功耗(375 µA和550 µA)和高性能(4 kHz和8 kHz带宽,25 µg/√Hz和59 µg/√Hz噪声密度)的集成,适用于多种应用场景。
Abstract
This article presents a 16-bit wide-bandwidth (BW)
high-performance (HP) three-axis micro-electromechanical sys-
tem (MEMS) accelerometer readout application-specific inte-
grated circuit (ASIC). It is the world’s first accelerometer to use
beyond-resonant-frequency sensing technique to extend the BW
by digitizing and equalizing the full sensor response including
the MEMS sensor resonance. The readout ASIC consists of dual
signal paths: three 16-bit HP signal paths to sense frequency-
rich signa