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Electronically tunable switch-mode high-efficiency adaptive band-pass filters for energy harvesting applications Gomez Cid-Fuentes, Raül Martínez García, Herminio Poveda López, Alberto Alarcón Cot, Eduardo José Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica Universitat Politècnica de Catalunya. CBA - Sistemes de Comunicacions i Arquitectures de Banda Ampla Universitat Politècnica de Catalunya. EPIC - Energy Processing and Integrated Circuits Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telemàtica i xarxes d'ordinadors Wireless communication systems Wireless sensor networks Adaptive filters Band-pass filters Energy harvesting Comunicació sense fil, Sistemes de Wireless Sensor Networks (WSN) present a pending challenge for a complete deployability due to energy requirements. The Self-Powered WSN approach aims to extend the sensor node life by means of Energy Harvesting. The harvested energy presents an erratic behavior in both time and frequency. In this paper, a new concept of switch-mode electronically tunable band-pass filters is presented to adaptively follow the power source variations and to maximize the power transfer. To implement these switch-mode filters, three alternatives are presented. These filter topologies are modeled and evaluated. Additionally, some design guidelines are provided. The results show how these high efficiency topologies present a band-pass behavior whose center frequency can be electronically tuned over one decade. The results target the integration of these high-efficiency switch-mode band-pass filters into the future harvesting front-ends. Peer Reviewed Postprint (published version) 2012 Conference report Gomez, R., Martinez, H., Poveda, A., Alarcon, E. Electronically tunable switch-mode high-efficiency adaptive band-pass filters for energy harvesting applications. A: IEEE International Symposium on Circuits and Systems. "Proceedings of the 2012 IEEE International Symposium on Circuits and Systems (ISCAS)". Institute of Electrical and Electronics Engineers (IEEE), 2012, p. 684-687. 978-1-4673-0218-0 https://hdl.handle.net/2117/117299 10.1109/ISCAS.2012.6272125 eng http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6272125 Restricted access - publisher's policy 4 p. application/pdf Institute of Electrical and Electronics Engineers (IEEE)