Wide-Range Highly-Efficient Wireless Power Receivers for Implantable Biomedical Sensors

Handle URI:
http://hdl.handle.net/10754/621866
Title:
Wide-Range Highly-Efficient Wireless Power Receivers for Implantable Biomedical Sensors
Authors:
Ouda, Mahmoud ( 0000-0002-2700-607X )
Abstract:
Wireless power transfer (WPT) is the key enabler for a myriad of applications, from low-power RFIDs, and wireless sensors, to wirelessly charged electric vehicles, and even massive power transmission from space solar cells. One of the major challenges in designing implantable biomedical devices is the size and lifetime of the battery. Thus, replacing the battery with a miniaturized wireless power receiver (WPRx) facilitates designing sustainable biomedical implants in smaller volumes for sentient medical applications. In the first part of this dissertation, we propose a miniaturized, fully integrated, wirelessly powered implantable sensor with on-chip antenna, designed and implemented in a standard 0.18μm CMOS process. As a batteryless device, it can be implanted once inside the body with no need for further invasive surgeries to replace batteries. The proposed single-chip solution is designed for intraocular pressure monitoring (IOPM), and can serve as a sustainable platform for implantable devices or IoT nodes. A custom setup is developed to test the chip in a saline solution with electrical properties similar to those of the aqueous humor of the eye. The proposed chip, in this eye-like setup, is wirelessly charged to 1V from a 5W transmitter 3cm away from the chip. In the second part, we propose a self-biased, differential rectifier with enhanced efficiency over an extended range of input power. A prototype is designed for the medical implant communication service (MICS) band at 433MHz. It demonstrates an efficiency improvement of more than 40% in the rectifier power conversion efficiency (PCE) and a dynamic range extension of more than 50% relative to the conventional cross-coupled rectifier. A sensitivity of -15.2dBm input power for 1V output voltage and a peak PCE of 65% are achieved for a 50k load. In the third part, we propose a wide-range, differential RF-to-DC power converter using an adaptive, self-biasing technique. The proposed architecture doubles the dynamic range of conventional rectifiers. Unlike the continuously self-biased rectifier proposed in the second part, this adaptive rectifier extends the dynamic range while maintaining both the high PCE peak and the sensitivity advantage of the conventional cross-coupled scheme, and can operates in the GHz range.
Advisors:
Salama, Khaled N. ( 0000-0001-7742-1282 )
Committee Member:
Alshareef, Husam N. ( 0000-0001-5029-2142 ) ; Shamim, Atif ( 0000-0002-4207-4740 ) ; Volakis, John
KAUST Department:
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Program:
Electrical Engineering
Issue Date:
Nov-2016
Type:
Dissertation
Appears in Collections:
Dissertations

Full metadata record

DC FieldValue Language
dc.contributor.advisorSalama, Khaled N.en
dc.contributor.authorOuda, Mahmouden
dc.date.accessioned2016-11-23T06:18:33Z-
dc.date.available2016-11-23T06:18:33Z-
dc.date.issued2016-11-
dc.identifier.urihttp://hdl.handle.net/10754/621866-
dc.description.abstractWireless power transfer (WPT) is the key enabler for a myriad of applications, from low-power RFIDs, and wireless sensors, to wirelessly charged electric vehicles, and even massive power transmission from space solar cells. One of the major challenges in designing implantable biomedical devices is the size and lifetime of the battery. Thus, replacing the battery with a miniaturized wireless power receiver (WPRx) facilitates designing sustainable biomedical implants in smaller volumes for sentient medical applications. In the first part of this dissertation, we propose a miniaturized, fully integrated, wirelessly powered implantable sensor with on-chip antenna, designed and implemented in a standard 0.18μm CMOS process. As a batteryless device, it can be implanted once inside the body with no need for further invasive surgeries to replace batteries. The proposed single-chip solution is designed for intraocular pressure monitoring (IOPM), and can serve as a sustainable platform for implantable devices or IoT nodes. A custom setup is developed to test the chip in a saline solution with electrical properties similar to those of the aqueous humor of the eye. The proposed chip, in this eye-like setup, is wirelessly charged to 1V from a 5W transmitter 3cm away from the chip. In the second part, we propose a self-biased, differential rectifier with enhanced efficiency over an extended range of input power. A prototype is designed for the medical implant communication service (MICS) band at 433MHz. It demonstrates an efficiency improvement of more than 40% in the rectifier power conversion efficiency (PCE) and a dynamic range extension of more than 50% relative to the conventional cross-coupled rectifier. A sensitivity of -15.2dBm input power for 1V output voltage and a peak PCE of 65% are achieved for a 50k load. In the third part, we propose a wide-range, differential RF-to-DC power converter using an adaptive, self-biasing technique. The proposed architecture doubles the dynamic range of conventional rectifiers. Unlike the continuously self-biased rectifier proposed in the second part, this adaptive rectifier extends the dynamic range while maintaining both the high PCE peak and the sensitivity advantage of the conventional cross-coupled scheme, and can operates in the GHz range.en
dc.language.isoenen
dc.subjectAC-to-DC power converteren
dc.subjectAdaptive rectifieren
dc.subjectImplantable devicesen
dc.subjectRF energy harvestingen
dc.subjectRFIDen
dc.subjectwireless poweringen
dc.titleWide-Range Highly-Efficient Wireless Power Receivers for Implantable Biomedical Sensorsen
dc.typeDissertationen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
thesis.degree.grantorKing Abdullah University of Science and Technologyen_GB
dc.contributor.committeememberAlshareef, Husam N.en
dc.contributor.committeememberShamim, Atifen
dc.contributor.committeememberVolakis, Johnen
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.nameDoctor of Philosophyen
dc.person.id113072en
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