Bernhard Boser (Advisor)

BEB13: Background Calibration for Low-Power High-Performance A/D Conversion

Boris Murmann

Our project aims to develop and investigate on digital post processing methods and circuit techniques that allow efficient, low power implementation of high performance Analog-to-Digital Converters (ADC) in fine line technologies. The research focuses on a continuous background self-calibration technique applied to a high-speed pipelined ADC topology.

Project end date: 01/25/04

BEB20: Phase Noise Considerations of a MEMS Oscillator

Manu Seth

Oscillators based on MEMS resonators have been developed but their performance has not been thoroughly investigated. Phase noise has been measured in numerous oscillator designs, but it has not been determined whether these oscillators can meet the specifications of practical applications. This project will attempt to determine some of the limits of MEMS based oscillators in terms of phase noise. I will study the feasibility of using MEMS oscillators as the frequency reference in phase-locked loops. I will then design oscillator circuits meant to minimize noise and meet standard PLL...

BEB7: Electronic Interface for Micromachined Gyroscope Sensors

Vladimir Petkov

The goal of this project is to develop a high-resolution closed-loop sense interface for micromachined gyroscope sensors.

Project end date: 08/18/04

BEB21: Background calibration techniques for digitally assisted ADC

Anshi Liang

Develop new background calibration techniques for low power digitally assisted Analog-to-Digital Converters (ADCs). The goal is achieve significant savings in convergence time. A proof-of-concept FPGA realization calibration module will be built for a 12-bit, 75-MS/s demonstration prototype previously developed by Boris Murmann.

Project end date: 01/20/05

BEB16: Resonant Drive: Sense and High Voltage Electrostatic Drive Using Single MEMS Electrode

Baris Cagdaser

A new technique for electrostatic drive and sense is developed. The main goal is to simplify the complexity of drive and sense circuitry. The new approach will alleviate the need for high voltage circuitry even in voltage demanding MEMS applications. Since only a single drive capacitor is needed for both drive and sense, resonant drive will also simplify the design of the physical device.

Project end date: 02/03/05

BEB18: MEMS Strain Gauges on Steel: Electronic Interfaces for Resonant Sensors

Kenneth Wojciechowski

The objective of this research is to develop electronic interface circuits to measure strain in automobile machine elements with a silicon micromachined resonant sensor. The strain sensor is required to have a resolution of 0.1 microstrain over a range of +/- 1000 microstrain and a measurement bandwidth of 10kHz. The dimensions of the strained areas in the bearings are on the order of 100-200 microns and therefore gauge lengths of the strain sensor must be in this range. The smallest commercially available strain sensors have gauge lengths of around 1mm are too large and thus micro-...

BEB19: Low-Power High-Performance Analog-to-Digital Converters

Dimitrios Katsis

Develop enabling circuit techniques to increase the compatibility of high performance analog-to-digital converters with deep sub-micron technologies.

Project end date: 08/01/06

BEB22: A Sub-mW Mode Matching Sigma-Delta Vibratory Gyroscope Readout Circuit

Chinwuba D. Ezekwe

We present the design and experimental results of a low-power, high-resolution gyroscope readout circuit. Several techniques are combined to enable an unprecedented level of power savings. Chief among them are automatic mode-matching, positive position sigma-delta force-feedback, and current integrator based position sensing. Mode-matching relaxes the electronic noise budget of the front-end amplifier by the sense Q, resulting in a proportional reduction in front-end power dissipation. Unfortunately, it also results in an extremely narrow open-loop sensor bandwidth owing to the high...

BPN407: Modular-Based Integration of CMOS Chip with Microfluidics for Immunosensing

Amy Wu
Lisen Wang

The project aims to develop an integration method for CMOS chip and microfluidics, specifically for immunosensing system with microfluidic system for sample preparation and CMOS magnetic sensor for detection. Solving the size mismatch between CMOS chip (typically mm scale) and microfluidics (cm scale) while maintaining the functionality and interconnect metallization of CMOS, as well as seamlessly delivery the fluid to the sensor surface on the CMOS chip through microfluidics are the key considerations for the integration. On the other hand, the integrated biosensor will be a...

BPN445: Lab-on-a-Chip with Integrated CMOS Detection for Complex Assays

Lisen Wang
Amy Wu
Paul Liu
Octavian Florescu

The goal of this project is to develop a fully integrated lab-on-a-chip microdevice for performing complex immunological assays and to apply it to the sensitive detection of PAH-protein adducts produced by environmental exposure. The ultimate device will consist of a microfluidic cartridge with embedded sensors capable of performing a wide variety of assays. Specific steps that will be demonstrated include sample preparation, mixing with reagents, incubation, and multiple target detection. Although these capabilities will be demonstrated for the detection of PAH-protein adducts, the...