SWITCHED-CAPACITOR NEUROMORPHS WITH WIDE-RANGE VARIABLE DYNAMICS

The use of switched capacitors as wide-range, programmable resistive e lements in spatially extensive artificial dendritic trees (ADT's) is d escribed. We show that silicon neuromorphs with ADT's can produce impu lse responses that last millions of times longer than the initiating i mpulse and that dynamical responses are tunable in both shape and dura tion over a wide range. The switched-capacitor resistors forming a den dritic tree are shown indirectly to have a useful programmable resista nce range between 500 K Omega and 1000 G Omega. Experimental results a re presented that show variable impulse response functions, tunable fr equency selectivity, and rate-invariance of spatiotemporal pattern res ponses.