Vision chip with high accuracy analog S2I cells

A mixed signal vision chip has been designed in a 0.18um 1P6M process. The chip incorporates a 256x256 array of processing elements, each element including 7 analog registers and 14 digital storage cells. By the programmable reconfiguration of these read/write storage elements, a compact and powerful processor array is enabled. Configuration options include setting up an array-wide analog diffusion network, and an asynchronous propagation network, allowing un-clocked inter-processor logic operations at 62x speed-up over synchronous equivalent operations. Analog registers degrade at ~1% of full-scale per second and show an offset error during a copy operation of 0.07% of register range.