论文标题
有机日志域积分器突触
Organic log-domain integrator synapse
论文作者
论文摘要
突触在记忆，学习和认知中起关键作用。它们的主要功能包括将突触前的电压尖峰转换为突触后电流，以及缩放输入信号。已经提出了几种脑启发的架构来模仿生物突触的行为。尽管这些对于探索神经系统的特性很有用，但用生物学上合理的时间常数和可调增益的生物相容性和柔性电路的挑战。在这里，显示出物理灵活的有机日志积分器突触电路可应对这一挑战。特别是，该电路是使用具有电活动的有机基材料制造的，具有柔韧性和生物相容性，以及在生物学上可行的时间常数（对于学习神经代码和编码时空模式的至关重要）。使用10 NF突触电容器，时间常数分别达到126 ms和221毫秒，分别在弯曲之前和期间达到221毫秒。在弯曲之前和期间表征了柔性突触电路，然后研究加权电压，突触电容和突触前信号在时间常数上的影响。
Synapses play a critical role in memory, learning, and cognition. Their main functions include converting pre-synaptic voltage spikes to post-synaptic currents, as well as scaling the input signal. Several brain-inspired architectures have been proposed to emulate the behavior of biological synapses. While these are useful to explore the properties of nervous systems, the challenge of making biocompatible and flexible circuits with biologically plausible time constants and tunable gain remains. Here, a physically flexible organic log-domain integrator synaptic circuit is shown to address this challenge. In particular, the circuit is fabricated using organic-based materials that are electrically active, offer flexibility and biocompatibility, as well as time constants (critical in learning neural codes and encoding spatiotemporal patterns) that are biologically plausible. Using a 10 nF synaptic capacitor, the time constant reached 126 ms and 221 ms before and during bending, respectively. The flexible synaptic circuit is characterized before and during bending, followed by studies on the effects of weighting voltage, synaptic capacitance, and disparity in pre-synaptic signals on the time constant.
