Publications

Predictions of the proliferation of hundreds of billions of connected wireless devices have yet to come true. The economics of such deployments becoming feasible require that current wireless modules become smaller, cheaper, and use less power. A typical wireless device combines a RF System-on-Chip with multiple frequency references, passive components, anantenna, and a battery on a printed circuit board. The Single Chip Mote project aims toreduce the size, weight, power, and cost of these devices by eliminating the off...

Both the accuracy of the clocks and ability of filters to achieve bandwidths small enough to select individual channels depend heavily on the accuracy and precision to which the frequency-setting devices they rely on are constructed. Inevitably, fabrication tolerances are finite, which means the ability to attain the highest performance relies on trimming or tuning. This dissertation focuses on methods by which voltage-controlled frequency tuning of capacitively-transduced micromechanical resonators make possible 1) an ultra-compact, low-power 32.768-kHz micromechanical clock...

This dissertation describes the design and implementation of an immunoassay platform based on micron-scale magnetic beads. We target the diagnosis of infectious diseases in developing countries, where small, inexpensive, and automated tests are required. Conventional sensor technologies, such as Giant Magneto-Resistors (GMRs), have excellent sensitivity but are expensive and difficult to integrate with other circuitry. The system presented here is built around a CMOS sensor chip and uses standard manufacturing techniques present in the electronics industry. CMOS technology can...