Authors: E. Yahya, Y. Ismail, M. Ismail
Affilation: American University in Cairo/ Zewail City of Science and Technology, Egypt
Pages: 13 - 16
Keywords: body sensor network, sensor node, asynchronous
Medical electronics, especially implanted devices, are operated in harsh and unstable operating conditions in which these systems must operate correctly. Medical electronics are usually powered using batteries and/or energy harvesters. This implies that they must be ultra-low power; and they must cope with supply voltage variations. Biosignals are usually band limited; and they are sparse in time domain. As a result, using uniform sampling for biosignals acquisition is costly and inefficient. Non-uniform sampling which is based on level crossing techniques is much efficient to be used in biomedical circuits. In the emerging concept of “Body Sensor network”, there are several sensors which are implanted in the body and communicate among each other and with the external world. There is a growing demand to secure the whole network against different attacks to guarantee the patient security and privacy.Based on the above discussion, the hardware technology used to implement body area network nodes must have the following characteristics: Ultra-low power, robustness against variations in the operating conditions, suitability for non-uniform sampling, and immunity to security attacks. In this paper, an ultra-low power body sensor node is proposed; its design is based on asynchronous technology which efficiently satisfies the required characteristics discussed above.