Wireless, RF & Smart Dust

Research that includes:

  • Tuneable RF components: capacitors, inductors, transformers
  • RF microrelays
  • High frequency MEMS resonators: devices, structures, and processes

KSJP25: Ultra-Low Power Radio for Sensor Networks

Alyosha Molnar

Wireless sensor networks require cheap, very low power radios. We are exploring simple circuits in standard analog CMOS to provide this functionality. Although performance requirements are relatively easy, the transceiver should only consume on the order of 1mW. The challenge therefore is to provide relatively high transmitter efficiency even when radiating relatively little power, and to maintain a relatively selective, sensitive receiver while consuming as little current as possible. At a 1% duty cycle from a standard lithium-ion coin cell, this implies several years of operation...

APP61: Integrated Nano Mechanically-Regulated Atomic Clock: 3.4 GHz Resonator

James M. Porter Jr.

Nano-scale piezoelectric resonators will be designed, fabricated and incorporated into an Integrated Nano Mechanically-Regulated Atomic Clock in order to reduce mass, size, and power consumption. This project focuses on the design and modeling of these resonators.

Project end date: 08/26/04

KSJP24: Ivy - A Sensor Network Infrastructure for the College of Engineering

Jaein Jeong

IVY is a research infrastructure of networked sensors for the College of Engineering at UC Berkeley.

Project end date: 08/30/04

KSJP23: Steered Agile Laser Transmitter (SALT)

Matthew Last

To develop steered narrow-beam optical communication devices capable of communicating wirelessly between cubic-millimeter autonomous sensing platforms.

Project end date: 01/20/05

APP36: GHz Nano-Mechanical Resonators

Brian Bircumshaw

The objective of this project is to design, fabricate, and demonstrate Nano-Mechanical Resonators (NMRs) with GHz natural frequencies. The Radial Bulk Annular Resonator (RBAR), our newest concept, represents a breakthrough in NMR design. Unlike its contemporaries, the RBAR can be arbitrarily sized for any given frequency. This provides design flexibility and increases the mechanical Q of the RBAR. Most importantly, the arbitrary sizing of the RBAR means tremendous reductions in the device’s equivalent resistance, Req. This leads to drastically reduced insertion loss, lower power...

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

KSJP20: CMOS Imaging Receiver for Free-Space Optical Communication

Chinwuba D. Ezekwe

A 256 element CMOS imaging receiver has been designed to receive low-power, free-space optical transmissions between unmanned aircraft, or other small, low power platforms, at a distance of several kilometers.

Project end date: 02/03/05

RTH39: Post-process of GHz-range SiGe Resonators Over Standard RF CMOS Circuitry for Transceiver Applications

Emmanuel Quevy

While MEMS resonators are about to demonstrate their potential for future transceiver architectures, the need for low parasitics low power performances implies shrinkage towards fully integrated systems. The preliminary goal of this project is to provide access to a post-process scheme of SiGe structures that enables integration of GHz resonators with Deep-Submicron CMOS RF ICs available from commercial vendor.

Project end date: 08/31/05

RTH44: Self-Healing RF MEMS Switch

Rishi Kant

The objective of this project is to create an RF MEMS switch with the capability of self-healing in order to perform hot switching of large currents. Traditional electrostatic actuation is used for closing the switch. Liquid Gallium is used for making contact thus alleviating the problem of thermal and mechanical deformation due to hot switching. The liquid droplets are confined to a distinctive pattern by exploiting the different wetting affinities that gallium has to different materials. Thermally vaporized gallium is reclaimed during the closing of the switch. The benefits derived...

NT24: High-Performance MEMS Capacitors

Dan McCormick
Ming Li

A set of MEMS based variable capacitors will be designed, fabricated, characterized and integrated into QUASAR’s free-space capacitive EEG sensor for ultra-sensitive charge measurement.

Project end date: 08/31/05