title: Real-time reconfigurable subthreshold CMOS perceptron.
abstract: In this paper, a new, real-time reconfigurable perceptron circuit element is presented. A six-transistor version used as a threshold gate, having a fan-in of three, producing adequate outputs for threshold of T =1, 2 and 3 is demonstrated by chip measurements. Subthreshold operation for supply voltages in the range of 100-350 mV is shown. The circuit performs competitively with a standard static complimentary metal-oxide-semiconductor (CMOS) implementation when maximum speed and energy delay product are taken into account, when used in a ring oscillator. Functionality per transistor is, to our knowledge, the highest reported for a variety of comparable circuits not based on floating gate techniques. Statistical simulations predict probabilities for making working circuits under mismatch and process variations. The simulations, in 120-nm CMOS, also support discussions regarding lower limits to supply voltage and redundancy. A brief discussion on how the circuit may be exploited as a basic building block for future defect tolerant mixed signal circuits, as well as neural networks, exploiting redundancy, is included.
authors.affiliation: Department of Informatics, University of Oslo, Oslo, Norway. aunet@ieee.org
authors.forename: S
authors.initials: S
authors.lastname: Aunet
authors.forename: B
authors.initials: B
authors.lastname: Oelmann
authors.forename: P A
authors.initials: PA
authors.lastname: Norseng
authors.forename: Y
authors.initials: Y
authors.lastname: Berg
mesh_terms: D000703:Analog-Digital Conversion; D003192:Compulsive Behavior; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D016571:Neural Networks, Computer; D010087:Oxides; D012666:Semiconductors; D013997:Time Factors
chemical_list: D010087:Oxides