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An area and energy‐efficient physically unclonable function (PUF) based on k‐winners‐take‐all (k‐WTA) is presented. Competitive computing dynamics of k‐WTA reduces key‐generation cell in WTA‐based PUF to a single transistor, necessary for area/energy‐constrained applications. Differential key generation in the PUF generates stable keys at varying temperature and supply voltage variations. Array design considerations for WTA‐PUF are studied. Performance of k‐WTA‐based PUF is compared against the static random access memory (SRAM)‐based PUF. [ABSTRACT FROM AUTHOR]

Multichannel coil arrays are increasingly being used to improve signal‐to‐noise ratio in magnetic resonance imaging (MRI). The decoupling between coils is an important parameter in array design. Indeed coupling between elements affects the resonance frequency of each single coil and decreases its sensitivity. Many solutions have been developed to achieve decoupling between elements of the multichannel coil array. Presented is a capacitive solution to restore channel decoupling of a specific four‐channel receiver coil array using common conductors. The principle of an effective decoupling was first demonstrated by circuit simulations of |S|‐parameters. A receive‐only four‐channel coil array was design for rat head MRI. Experimental |S|‐parameter measurements validated the proposed capacitive approach by restoring decoupling between elements and particularly between external loops. [ABSTRACT FROM AUTHOR]