Micro-power circuits and systems for wireless sensor nodes and implantable medical devices

Hansraj Singh Bhamra, Purdue University


Wireless body sensor nodes and implantable biosensing devices have the potential to fundamentally change the healthcare for patients suffering from limb amputation, debilitating neurological conditions, and chronic diseases. To date, there are not many treatment options available for patients with amputation and complex brain disorders to help them to retrieve mobility. Similarly, currently available diagnostic procedures and treatments for progressive diseases, such as glaucoma, and urinary incontinence are inadequate. Recent human studies demonstrate the possibility of multiple degrees-of-freedom in a prosthetic arm by capturing the weak motor control electromyogram (EMG) signals from reinnervated residual nerves via an implantable sensor node. Now, the next generation sensor nodes should provide the multi-node sensing capability, extremely low-power consumption, and small form-factor to allow for safe human use with indefinite life span and multiple functionalities. This thesis presents low-power and miniaturized circuits and two full-systems for prosthetic arm control and biological-pressure sensing, respectively. The first part of this dissertation presents the basic building blocks in a biopotential acquisition IC, designed to balance the tradeoff between noise, area and power consumption. In the second part, a 24 µW, batteryless, crystal-free, multinode synchronized SoC is presented for continuous and real time telemetry of EMGs, enabling intuitive upper limb prosthesis control by an amputee. The third part of this dissertation presents a 0.56 mm 2, micro-power, fully wireless, 24-hour biological-pressure sensing system. Implemented in a 0.18µm CMOS process, the system aims at measuring and transmitting the intraocular and bladder pressure data in real-time.




Irazoqui, Purdue University.

Subject Area

Biomedical engineering|Electrical engineering

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