Battery-less Transmitter and Frequency-Agile Receiver for IoT Applications

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dc.contributor.advisorBabakhani, Aydinen_US
dc.creatorLi, Daien_US
dc.date.accessioned2019-05-17T13:33:04Zen_US
dc.date.available2019-05-17T13:33:04Zen_US
dc.date.created2018-05en_US
dc.date.issued2018-04-19en_US
dc.date.submittedMay 2018en_US
dc.date.updated2019-05-17T13:33:04Zen_US
dc.description.abstractRecent increasing demands for IoT device, wearable device and biomedical implants have been calling for more low power, energy efficient and highly integrated devices from electronic industry. Implementing transmitter and energy-harvesting circuits on a same chip is a good way to provide battery-less systems for data transmission in wireless sensor networks. Prior wireless powered devices work used sub-gigahertz microwaves and require very large antenna for energy harvesting, which prevents their application in biomedical implants and single-chip integration. Our work on battery-less transmitter integrated on-chip antenna for 8 to 10 GHz wireless energy harvesting. This approach reduced antenna size and provided stable 10uW energy source for duty-cycled operating transmitter. The transmitter used On-Off Key (OOK) modulation. Oscillator, a class-E power amplifier and a dipole on-chip antenna are the main components of the transmitter. The transmitter operates at 1.46GHz and consumes 25mW power. The on-chip antenna is matched to the transmitter at 1.46GHz and could radiate up to -20dBm power into the air. By modulating from an external signal source, the data rate can be as high as 50M Bit/sec. The transmitter is able to harvest power from a radiating antenna 30cm away from the chip with a size of 7.4mm2 and transmit data back. Thus it is suitable for biomedical implant and wearable devices. On the other hand, our work introduced a frequency-agile receiver that detect and switch to the most power efficient channel quickly. The receiver consists of a band-switching low noise amplifier (LNA), an all-digital-phase-locked-loop (ADPLL), a power detector and a successive approximation analog to digital converter. The receiver worked at 4.3 to 5.7GHz and provide quick band-switching on the LNA and ADPLL. It provides quick and accurate channel selection in quickly changing environments.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationLi, Dai. "Battery-less Transmitter and Frequency-Agile Receiver for IoT Applications." (2018) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/105609">https://hdl.handle.net/1911/105609</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/105609en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectEnergy Harvestingen_US
dc.subjectTransmitteren_US
dc.subjectInternet of Thingsen_US
dc.subjectLow Noise Amplifieren_US
dc.subjectPhase-Locked-Loopen_US
dc.titleBattery-less Transmitter and Frequency-Agile Receiver for IoT Applicationsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentElectrical and Computer Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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