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We fabricated an improved version of an imager reported earlier [1], primarily by using better pixel circuit and layout principles. The new imager functions over 5 decades of background illumination and has much more symmetrical ON and OFF responses. This imager achieves massive redundancy reduction by temporally differentiating the image contrast. The(More)
??An integrated circuit with on-chip photoreceptors is described, that computes the bi-directional velocity of a visual stimulus moving along a given axis in the focal plane by measuring the time delay of its detection at two positions. Due to the compactness of the circuit, a dense array of such motion-sensing elements can be monolithically integrated to(More)
Acknowledgements I owe many thanks to my adviser, Prof. Dario Floreano, who gave me both freedom and support to pursue my project. I am equally indebted to him for having adapted this thesis project in order to combine both of my passions: autonomous robotics and aviation. Siegwart for participating in my thesis committee. They all three were at the origin(More)
We present a biophysically constrained cerebellar model of classical conditioning, implemented using a neuromorphic analog VLSI (aVLSI) chip. Like its biological counterpart, our cerebellar model is able to control adaptive behavior by predicting the precise timing of events. Here we describe the functionality of the chip and present its learning(More)
We describe a programmable multi-chip VLSI neuronal system that can be used for exploring spike-based information processing models. The system consists of a silicon retina, a PIC microcontroller, and a transceiver chip whose integrate-and-fire neurons are connected in a soft winner-take-all architecture. The circuit on this multi-neuron chip approximates a(More)
We present a multi-chip neuromorphic system in which an Address Event Representation is used for inter-chip communication. The system comprises an analog VLSI transient imager with adaptive photoreceptors, an analog VLSI motion receiver chip and a prototyping communication infrastructure which allows for programmability of connections between the elements(More)
—The implementation of a compact continuous-time optical transient sensor with commercial CMOS technology is presented. In its basic version, this sensor consists of a photodiode, five transistors and a capacitor. The proposed circuit produces several output signals in parallel. These include a sustained, logarithmically compressed measure of the incoming(More)
In the past years researchers at the California Institute of Technology (and in few other research institutions worldwide) have been concentrating their eeorts on the design and implementation of analog VLSI neuromorphic systems. Today this emerging technology seems to be mature enough for use in industrial applications. In this paper we give an overview of(More)