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Preprocessing of data before transmission is recommended for many sensor network applications to reduce communication and improve energy efficiency. However, constraints on memory, speed, and energy currently limit the processing capabilities within a sensor network. In this paper, we describe how ultra-low-power analog circuitry can be integrated with sensor nodes to create energy-efficient sensor networks. To demonstrate this concept, we present a custom analog front-end which performsdoi:10.1145/1791212.1791229 dblp:conf/ipsn/RumbergGK10 fatcat:v7mix6lfsvcd5aspz6ncnh4ajm