Theodore Van Duzer
Professor in the Graduate School
Department of Electrical Engineering and Computer Sciences
569 Cory Hall
University of California
Berkeley CA 94720-1770
Professor Van Duzer heads the Cryoelectronics Group in the Electrical Engineering and
Computer Sciences Department and the Electronics Research Laboratory. The research
activities of the group include:
- Research on the use of hybrids of
Josephson devices and CMOS at 4 K for random access memories. The goal is an enabling
local memory for a petaflop computer with superconductor single-flux-quantum processors.
Achievements include characterization of CMOS at 4 K and demonstration of many of the
component circuits of the memory.
- Research on composite CMOS-Josephson structures.
We have successfully fabricated series arrays of high
quality Josephson devices directly on top of CMOS devices.
- Innovations in processing of niobium
superconductor integrated circuits to increase control of parameters. Achievements
include control of sheet resistivity and premeasured tunneling current density, both to 3%
accuracy and on-chip critical current total spreads less than 1%, even on micron-size
junctions with 10 kA/cm^2 current density.
- Research on internally shunted Josephson devices with nonhysteretic I-V characteristics
for 4 K and 10 K operation.
These devices can have several
different applications, including single-flux-quantum logic circuits. The goal of the work
is to find materials to optimize the device properties. Initial devices show promise.
The laboratory for the group includes a fabrication
line for niobium integrated circuits, near-zero magnetic field environment for testing,
and a variety of high speed test equipment,
including a bit-error-ratio detector, at speeds in excess of 10 GHz.
Professor Van Duzer is co-author (with S. Ramo and J. R. Whinnery) of Fields and
Waves in Communication Electronics and (with C. W. Turner) Principles of
Superconductive Devices and Circuits.