**4. CMOS nervous system design**

With the respect to the analog design of neural code, our spiking neural network chip adapts the ISI temporal encoding scheme as it pre-signal processing module, as well as the reservoir computing module with delay topology as the processing element. Our spiking neural network, named as the analog delayed feedback reservoir (DFR) system is considered as the simplification of conventional reservoir

computing. By employing the delayed feedback structure within the system, our analog DFR system processes the functionality of high dimensional projection and short-term dynamic memory, whereby the behavior of biological neuron is achieved.
