Efficient and high-speed reconfigurable transceiver for miniaturized wirelessly powered implants
Abstract/Contents
- Abstract
- Small and versatile implantable devices that support distributed biosensing and localized operations could revolutionize modern medicine. Implantable systems will soon be an integral part of minimally invasive diagnostic, therapeutic, and surgical treatments to attain more accurate diagnosis and enhance the success rate of complex procedures. Wireless powering in combination with efficient high-speed reconfigurable transceivers that can accommodate a wide variety of biomedical applications and changing environmental conditions are essential for miniaturized medical implants. This thesis presents the detailed description of a wireless system architecture that enables the design of low-power battery-less implants. Wireless power transfer and very efficient high data rate communication techniques will be discussed. System and circuit design for two different miniaturized implantable devices, which were used to demonstrate these techniques, will be presented. The design challenges and tradeoffs of each of the projects will be discussed. The first project demonstrates efficient energy harvesting and forward data transfer as well as actuation for implants by providing up to several milliamps of current to power a magnetohydrodynamic propulsion system. The 3 mm x 4 mm prototype achieves 0.53 cm/sec speeds in fluid with a 0.06 T field using approximately 250 [microwatts], and receives data at up to 25 Mbps from a 2 W 1.86 GHz carrier. The second project illustrates the feasibility of low-power sensing for implants as well as an efficient reverse data link capable of robust operation in changing environmental conditions, which is common for implanted systems. The robustness was achieved through reconfigurable modulating load, pulse width, and data rate making this an attractive solution for a variety of applications, including the target application to develop a 1 mm3 implantable cardiac probe. External interrogator communicates with multiple devices using time domain multiple access. The implantable prototype consists of a 1 mm x 1 mm chip implemented in 65 nm CMOS process integrated with a 3D coil antenna and no other external components and consumes 10 [microwatts] while demonstrating wireless powering and two-way communication through 35 mm of tissue.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2013 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Yakovlev, Anatoly |
|---|---|
| Associated with | Stanford University, Department of Electrical Engineering. |
| Primary advisor | Poon, Ada Shuk Yan |
| Thesis advisor | Poon, Ada Shuk Yan |
| Thesis advisor | Lee, Thomas H, 1959- |
| Thesis advisor | Meng, Teresa H |
| Thesis advisor | Murmann, Boris |
| Advisor | Lee, Thomas H, 1959- |
| Advisor | Meng, Teresa H |
| Advisor | Murmann, Boris |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Anatoly Yakovlev. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2013. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2013 by Anatoly Yakovlev
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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