A microwatt front end and asynchronous ADC for sparse biopotential acquisition
A microwatt front end and asynchronous ADC for sparse biopotential acquisition
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用于稀疏生物电势采集的微瓦前端和异步 ADC
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
J. Rosenstein
中科院分区：
文献类型：
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作者：
J. Jiménez;Shanshan Dai;J. Rosenstein
我们提出了一个单片微瓦级模拟前端和异步电平交叉ADC的设计和实施，有效地捕捉稀疏的生物电位。低噪声差分交流耦合前端提供+40 dB增益，信号由异步电平交叉ADC数字化，该ADC将信号斜率编码为脉冲流。对于时间稀疏的信号，例如单个单元细胞外神经尖峰记录，与传统的奈奎斯特采样相比，该脉冲编码系统提供了功率节省和固有数据压缩。该电路采用0.18 μ mCMOS工艺，面积为0.0088mm2，功耗为750nA，采用1.8V电源供电。
We present the design and implementation of a monolithic microwatt analog front end and asynchronous level-crossing ADC for efficient capture of sparse biopotentials. The low-noise differential AC-coupled front-end provides +40 dB gain, and the signal is digitized by an asynchronous level-crossing ADC which encodes the signal slope into a stream of pulses. For temporally-sparse signals such as single-unit extracellular neural spike recordings, this pulse encoding system provides both power savings and intrinsic data compression as compared to traditional Nyquist sampling. The circuit occupies 0.0088 mm2 in 0.18 μm CMOS and consumes 750 nA from a 1.8 V supply.