%0 Journal Article %T Energy Efficient Design for Body Sensor Nodes %A Yanqing Zhang %A Yousef Shakhsheer %A Adam T. Barth %A Harry C. Powell Jr. %A Samuel A. Ridenour %A Mark A. Hanson %A John Lach %A Benton H. Calhoun %J Journal of Low Power Electronics and Applications %D 2011 %I MDPI AG %R 10.3390/jlpea1010109 %X This paper describes the hardware requirements and design constraints that derive from unique features of body sensor networks (BSNs). Based on the BSN requirements, we examine the tradeoff between custom hardware and commercial off the shelf (COTS) designs for BSNs. The broad range of BSN applications includes situations where either custom chips or COTS design is optimal. For both types of nodes, we survey key techniques to improve energy efficiency in BSNs and identify general approaches to energy efficiency in this space. %K body sensor networks %K sub-threshold circuits %K wearable computing %K energy efficient design %U http://www.mdpi.com/2079-9268/1/1/109