Bernhard Boser (Advisor)

BPN483: High Z Materials for Nuclear Detection

Mitchell H. Kline
Igor I. Izyumin
2009

Homeland security requires development of cost-effective nuclear detection capability to distinguish threats from non- threats. High atomic number (Z) semiconductor devices with high efficiency, sufficient energy resolution, and room temperature operation offer the potential to meet this objective rapidly, reliably, and inexpensively, but have been challenging to realize, despite significant efforts spanning 30 years. To achieve this important goal, there is strong consensus that fundamental limitations on charge collection in high Z materials must be understood, material quality...

BEB17: Fully Integrated Immunosensor

Octavian Florescu
2009

The long range goals are to develop and verify diagnostic assays for infectious diseases currently presenting significant threats to public health, including Dengue, Malaria, and HIV. We intend to demonstrate improved protocol simplicity compared to ELISA, the current immunoassay standard, with special emphasis on the applicability of the assay in a point of care or at home setting, where the advents of a research laboratory are not available.

Project end date: 02/04/10

BPN386: CMOS-Integrated Nanowire-Based Molecular and Gas Sensors

Karl Skucha
2010

This project first aims to develop a process flow to integrate silicon nanowires onto a CMOS substrate, both via and top-down and bottom-up processes. Then, by carefully designing the underlying circuitry and functionalizing the nanowire transducers, we hope to demonstrate a fully functional integrated sensing platform for various molecular agents and/or gases. The overall goal and application is to create an easy-to-use CMOS-based sensing system for low-cost portable applications.

Project end date: 02/04/10

BPN563: LIDAR (Light Detection And Ranging) with MEMS

Erwin K. Lau
2010

Two-dimensional imaging is limited in that it cannot provide depth perception. One can view objects in the distance, but cannot determine how far away these images are. Three-dimensional imaging, such as RADAR, can accomplish this, but radio wavelengths are too long to provide detailed resolution. LIght Detection And Ranging (LIDAR) uses optical wavelengths, providing easily four orders of magnitude better resolution, allowing the imaging of sub-millimeter detail or better. However, the conventional LIDAR method employs short optical pulses that need high-speed, 2-D photodetection,...

BPN593: Design and Modeling of Liquid Bearing Electrostatic Micromotor

Zhaoyi Kang
2011

This project aims to design and develop an actuation system based on liquid bearing micro-rotary stage (micro-motor). The liquid bearing is essentially a small volume of fluid confined between the rotor and stator through Teflon surface coatings, which is capable of supporting both static and shock loads with reduced mechanical vibrations. The rotor is actuated by the three-phase electrostatic torque between the rotor and stator electrodes. We will develop analytical and numerical model to analyze and optimize the stationary and transient rotary of the micro-motor. Another major task...

BPN604: Readout Circuits for AlN Resonant Sensors

Igor I. Izyumin
2011

Resonant MEMS sensors are commonly used for sensing pressure, mass, force, strain, and acceleration. Resonant readout is particularly attractive for piezoelectric sensors, since it is the only method that allows measurement of static or slowly-varying quantities. Fundamentally, resonant readout relies on a fixed dependence between the quantity to be measured and the resonant frequency of a mechanical structure. However, the resonant frequency is generally also a strong function of several unwanted variables, including temperature, fabrication variability, and packaging stress. One...

BPN475: A CMOS Magnetic Sensor Chip for Biomedical Assay

Karl Skucha
2012

This project aims to develop a compact CMOS biosensor for robust detection of micron-sized paramagnetic beads which are used as labels for target analyte in biomedical applications.No external magnet, reference sensors or calibration is required. A 4.5-um bead is detected in 16 ms with probability of detection error < 0.1%. The ultimate goal of this project is to integrate the CMOS sensor chip with micro-fluidic system and demonstrate a lab-on-a-chip platform.

Project end date: 08/16/12

BPN555: Power Transfer Over a Capacitive Interface

Mitchell H. Kline
Igor I. Izyumin
2012

The simplicity and low cost of capacitive interfaces makes them very attractive for wireless charging stations. Major benefits include low electromagnetic radiation and the amenability of combined power and data transfer over the same interface. We present a capacitive power transfer circuit using series resonance that enables efficient high frequency, moderate voltage operation through soft-switching. An included analysis predicts fundamental limitations on the maximum achievable efficiency for a given amount of coupling capacitance and is used to find the optimum circuit component...

BPN612: High-Throughput CMOS Detector for Magnetic Immunoassays

Simone Gambini
2012

The goal of this project is to design an electronic system capable of detecting the presence of < 2.8um magnetic beads over a biologically relevant number of sensing sites in less than 10 seconds, giving an over 10X improvement in measurement time over prior art. We use a combination of signal processing and low-noise circuit design techniques to obtain this goal.

Project end date: 08/17/12

BPN485: Ultrasonic Gesture Recognition on a Chip

Richard J. Przybyla
Hao-Yen Tang
2013

Optical 3D imagers for gesture recognition, such as Microsoft Kinect, suffer from large size and high power consumption. Their performance depends on ambient illumination and they generally cannot operate in sunlight. These factors have prevented widespread adoption of gesture interfaces in energy- and volume-limited environments such as tablets and smartphones. Gesture recognition using sound is an attractive candidate to overcome these difficulties because of the potential for chip-scale solution size, low power consumption, and ambient light insensitivity. Our research focuses on...