Bernhard Boser (Advisor)

A High-Voltage Charge Pump in Bulk CMOS

Eugene Lau Cheung
Bernhard Boser
Albert P. Pisano

The goal of this project is to investigate a circuit for generating 80V in a bulk CMOS technology. This voltage is needed for powering a micromachined electrostatic actuator, and it must be generated from a 5V ...

BPN421: Pipelined ADC Utilizing Passive Inter-stage Gain

Yida Duan

To meet demands for mobile electronic, power has become limiting factor for most ADC design. In pipelined ADC structure, Inter-stage Gain circuits are the most power hungry building block. Conventionally, Inter-stage gain circuits are implemented using feedback an OTA with a less-than-1 feedback factor (i.e. 1/2 to 1/3). This approach is costly because these OTAs drive not only the load capacitors, but also the sampling and feedback capacitors. As a result, the power consumption of these amplifiers is a feedback factor (i.e., 2 to 3X) worse than their counterparts in unity gain...

Capacitive Position-Sensing Interface for Micromachined Inertial Sensors

Xuesong Jiang
Bernhard E. Boser
Roger T. Howe
Roberto Horowitz

A monolithic MEMS/circuits technology enables the implementation of multiple sensors and more functions, such as sensing, signal processing and actuation, on a single chip. In this work, issues related to monolithic integration of micromachined inertial sensors, including accelerometers and gyroscopes, are investigated. Mechanical sensitivity, noise, and experimental performance verification of the open-loop accelerometer are discussed. The resolution of a position-sensing accelerometer can be improved by increasing the mechanical sensitivity and the accuracy of position measurement. 1¹G=...

Rozhan Rabbani

Graduate Student Researcher
Electrical Engineering and Computer Sciences
Professor Bernhard E. Boser (Advisor)
Ph.D. 2023 (Anticipated)

I'm Rozhan Rabbani and I was born in Urmia, Iran. Since Fall 2013, I have studied at Sharif University of Technology, Tehran, Iran. Studying electronics engineering as my main major minored with economics, has broaden my view toward engineering with an economical and managerial perspective. I have done research both on low power biomedical systems and RF design under supervision of renowned electronics professors at Sharif University of Technology. I'd like to pursue my interests in vast research areas of electronics including RF IC Design, Low Power Biomedical Circuits and Wearable...

BPN910: Frequency Modulated MEMS Gyroscopes with Extremely Small Errors

Burak Eminoglu

High-performance gyroscopes are key elements of inertial navigation systems. Miniaturization of these sensors is desirable to achieve low manufacturing cost, low weight, small size, and low energy consumption. Although miniaturized gyroscopes have been used in a wide range of applications such as gaming and image stabilization, their low performance prevents their implementation in inertial navigation systems. The main goal of this research is to identify, analyze, and characterize parameters that limit the performance of frequency-modulated (FM) gyroscopes and develop extremely high-...

BPN852: Frequency to Digital Converter for FM Gyroscopes

Burak Eminoglu

Frequency modulated (FM) gyroscopes are a new class of inertial sensors which measure the angular rotation rate. They offer several advantages including accurate scale factor, large dynamic range, and robust performance over temperature variation. The frequency of the output signal should be detected precisely to extract the slight frequency variations in the modulated signal. This research focuses on the design of high-resolution frequency to digital converters (FDC) for use as the interface circuit for FM gyroscopes. In particular, it is intended to optimize noise performance, dynamic...

Chip-Scale Fluorescence Microscope

Efthymios Papageorgiou

CMOS image sensors have been widely used for decades, largely displacing CCD technology in cameras, scanners, telescopes, and a variety of medical sensors. Photodiodes are formed in the IC substrate and the technology has been repurposed to make more advanced structures with higher sensitivity, such as pinned or avalanche photodiodes. Less work has gone into generating optical elements using other features of the CMOS process, namely the metal interconnect. The precision deposition and spacing of the metal layers allows a variety of optical structures to be fabricated within the image...

High Performance FM Gyroscopes

Burak Eminoglu

MEMS gyroscopes are used in a wide range of applications such as gaming and image stabilization. However, the poor long-term stability of consumer MEMS gyroscopes precludes their use in demanding applications such as inertial navigation. Although devices with higher performance are available, they suffer from substantially higher power dissipation, size, and cost. For wider adoption it is imperative to find solutions that reduce drift without compromising the advantages of MEMS gyroscopes.

This thesis focuses on scale factor and bias stability. The scale factor of any sensor is set...