CMOS Low-Power Dynamic Impedance Matching System for Wireless Power Transfer and Pressure Sensor Design for Implantable Devices

Yu-Wen Huang, Purdue University

Abstract

With the fast progress of circuits and systems in the biomedical application recently, highly integrated and performance guaranteed implantable devices are becoming more important in the medicine field. The implantable devices, or implants, communicate with the sensitive body parts such as heart and veins often, rising the safety concern on the design restriction even more than the past. Understanding these requirements and applications will help the device developers to reallocate the effort and attention during the design procedure, which will pave the way to disease control and early diagnosis. Glaucoma is a modern growing disease which causes the malfunction of eyesight. While the pressure inside the eye increases, it damages the optical nerve. To assist the clinical study on animal model, we provide a solution to power up an implantable eye pressure monitor through wireless power transfer (WPT) in this thesis. It is a custom design on semiconductor technology. The internal feedback loop tracks the power transfer efficiency (PTE) on voltage domain and optimize the efficiency. The overview of the architecture will be introduced, as well as the design of each essential block with trade-off consideration, and the concept of digital control flow through state machine. Simulation and measurement results are also provided. A novel pressure sensor is also presented. It provides a wide dynamic range and can be used to measure the biological pressure and for integration into wearable or implantable devices. It consists of bio-compatible materials and its dimension is scalable without clean room process needed. The fabrication process and characterization will be introduced as well as the in vivo surgical setup and measurement results.

Degree

Ph.D.

Advisors

Irazoqui, Purdue University.

Subject Area

Electrical engineering

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