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dc.contributor.authorZhak, Serhii M.
dc.contributor.authorBaker, Michael W.
dc.contributor.authorSarpeshkar, Rahul
dc.date.accessioned2004-10-12T14:21:27Z
dc.date.available2004-10-12T14:21:27Z
dc.date.issued2004-10-12T14:21:27Z
dc.identifier.urihttp://hdl.handle.net/1721.1/6743
dc.descriptionAuthor Information Zhak: Department of Electrical Engineering and Computer Science, MIT, Cambridge, MA 02139. Baker: Department of Electrical Engineering and Computer Science, MIT, Cambridge, MA 02139. Sarpeshkar: Department of Electrical Engineering and Computer Science, MIT, Cambridge, MA 02139.en
dc.description.abstractWe report a 75dB, 2.8mW, 100Hz-10kHz envelope detector in a 1.5mm 2.8V CMOS technology. The envelope detector performs input-dc-insensitive voltage-to-currentconverting rectification followed by novel nanopower current-mode peak detection. The use of a subthreshold wide- linear-range transconductor (WLR OTA) allows greater than 1.7Vpp input voltage swings. We show theoretically that this optimal performance is technology-independent for the given topology and may be improved only by spending more power. A novel circuit topology is used to perform 140nW peak detection with controllable attack and release time constants. The lower limits of envelope detection are determined by the more dominant of two effects: The first effect is caused by the inability of amplified high-frequency signals to exceed the deadzone created by exponential nonlinearities in the rectifier. The second effect is due to an output current caused by thermal noise rectification. We demonstrate good agreement of experimentally measured results with theory. The envelope detector is useful in low power bionic implants for the deaf, hearing aids, and speech-recognition front ends. Extension of the envelope detector to higher- frequency applications is straightforward if power consumption is incen
dc.description.sponsorshipPackard Foundation and an ONR Young Investigator Award.en
dc.format.extent604455 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.relation.ispartofseriesTechnical Report (Massachusetts Institute of Technology, Research Laboratory of Electronics);664
dc.subjectBionic Ear, Cochlear Implant,en
dc.subjectPeak Detector,en
dc.subjectUltra-Low Power,en
dc.subjectHearing Aids,en
dc.subjectEnvelope Detector,en
dc.titleA Low Power Wide Dynamic Range Envelope Detectoren
dc.typeTechnical Reporten


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