Facilities

 

The Microwave Electronics Laboratory is fortunate to be extremely well equipped for research.  Our dedicated laboratory space consists of three areas in the Engineering I building.  The first houses our personal computers and workstation cluster, as well as the graduate student office space, which is subdivided into semi-private cubicles. Our second lab houses the microwave and millimeter-wave instrumentation, device characterization equipment, and the anechoic chamber. The third area houses our oxide sputtering systems as well as a small meeting area.  All areas are shared by the York and Mishra Groups, reflecting many complimentary and collaborative interests.  wpe3.jpg (33962 bytes)
wpeE.jpg (32302 bytes) All students within our Electronic and Photonics program gain access to a number of other shared laboratory resources within the Sciences and Engineering infrastructure at UCSB.  These include essential laboratory facilities for advanced materials growth, device and monolithic circuit fabrication, hybrid circuit fabrication,  device characterization and analysis, and numerous other high-frequency and optical instrumentation and computer-aided design facilities.   These shared resources are a unique feature of the ECE department at UCSB, reflecting an excellent working relationship between our faculty and students, and creating a compelling environment for creative research.  The location is not bad either!

York/Mishra Labs

High-Frequency Circuit and Device Characterization

Our lab contains a wide assortment of microwave and millimeter-wave instrumentation for device and circuit characterization. A 40GHz HP8722D Vector Network Analyzer and Summit-9000 probe station are available for routine small-signal scattering parameter measurements on devices and circuits.  A second 40GHz HP8722D and Cascade probe station arrangement (shown right) is configured for large-signal power measurements, using an external 50 Watt TWT source. This system also includes an ATN Load-pull system for automated large-signal characterization of power devices. Two HP 8563 spectrum analyzers are available with direct coverage to 26GHz, and extended coverage to 110GHz with external mixers. wpe2.jpg (39216 bytes)
nickamp2.jpg (34040 bytes) There are several HP438 microwave power meters, three HP8350 20GHz microwave sweepers, three 20GHz synthesizers, and a 40GHz synthesizer. We also have a Wiltron Scalar Analyzer, and an HP Microwave Transition Analyzer for high-frequency time-domain characterization. We have an HP 8970B Noise Figure meter and an HP8971C Noise Figure Test Set for 26 GHz Noise-Figure measurements. We also have an HP3048AR Phase Noise measurement system with a HP11729C Carrier noise test set for operation to 18GHz.
For low frequency device characterization we have both an HP 4145 and HP4155 semiconductor parameter analyzers, Keithley CV meter, curve tracer, and HP impedance analyzer, all coupled to a Signatone DC Probing station (Bottom right). Also available in our lab are both cryogenic DC and RF probing systems. The two cryogenic systems are portable and can be easily interfaced with all of our RF and DC test equipment.  Some of our instrumentation is also available for observing light-dependent effects on semiconductor devices. DCprobe.tif (258828 bytes)

Hybrid Circuit Construction

Several research projects require the construction of hybrid circuits where discrete devices or complex integrated circuits are bonded into a secondary substrate (typically a ceramic such as Al2O3 or AlN) which also carries thin-film or surface-mount passive components (resistors, inductors, capacitors), along with biasing networks and connectors.  The Microwave Electronics Laboratory has a dedicated WestBond 7476B-70B microprocessor-controlled wedge-wedge wire bonder (featured at left), and a Westbond 7372B Pick-and-Place system and Epoxy-die bonder. The latter also allows for mechanical scrub motion for eutectic soldering of power devices and MMICs.  In addition, the UCSB research clean room contains a Research Devices M-8A flip-chip aligner/bonding system.  Thin-film processing of the circuits and antennas is performed in any of our clean rooms. 
wpe2.jpg (24086 bytes)
The gentle art of wire-bonding
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Putting it all together

Anechoic Chamber

We are fortunate to have a dedicated walk-in anechoic chamber for our antenna work. Our chamber dimensions are approximately 20' x 10' x 10', lined with 4" pyramidal absorber over most of the sides, and 8" pyramidal absorber on the front and back walls, with some wedge absorber used in strategic locations to minimize reflections at grazing incidence. Chamber walls have -40 dB reflection coefficient at normal incidence at 4 GHz, improving steadily with increasing frequency. We have a custom-built dual-axis computer-controlled positioner that can accommodate antennas projecting 2ft or less from the center of rotation (up to a 4ft linear array). The source/detector antenna is mounted on a similar single-axis positioner, which allows us to make fully polarimetric 3D pattern measurements. All three stepper motors allow for angular increments of better than 0.02, and cover the full 360 range. In-house GUI software controls the positioners and data acquisition for fully automated measurements. Data is recorded using a 40 GHz HP8563 spectrum analyzer, which provides a dynamic range of better than 80\thinspace dB. Low noise amplifiers are available for increased dynamic range. A broadband 2-18 GHz horn antenna is typically used for most measurements, but standard gain horns are available from C-band through Ka-band. Godzilla.tif (193844 bytes)

Computing Resources

Our lab has excellent CAD facilities for mask generation, DC and high-frequency device modeling and circuit simulations. Available software includes L-edit, Magic, HP/EEsof, Spice, and Microwave Spice. These are running on personal computers, Sun Sparc stations, and HP workstations, all located in our lab. In addition, the ECE department has a cluster of 30 workstations that are available for general use. UCSB has site licenses for other commonly used software such as Mathematica and MatLab, and our lab maintains other in-house software for rigorous electromagnetic modeling of antennas and millimeter-wave circuits using FDTD.   In the equipment lab, several dedicated personal computers are equipped with data acquisition boards, GPIB boards, and stepper motor drivers for automated measurements, and are driven by in-house code or National Instruments LabVIEW code.
Naturally we have numerous personal computers are located in the student offices for word processing and presentation graphics, and are networked to laser printers, a color scanner, and color laser printer.  Due to the large number of students in our lab and the rapidly changing technology, our policy is to have a shared cluster.  Currently there is approximately one Pentium PC for every two students.

Shared Resources

The Sciences and Engineering Laboratories at UCSB include many resources for materials, device, and circuit characterization, as summarized below.  For more information, please also consult individual laboratory sites such as

bulletMaterials Research Laboratory: Central Facilities
bulletUCSB Nanofabrication Facility

Clean Room (Nanofabrication Facility)

Our research clean room is geared towards fabrication of compound semiconductor devices and quantum structures.
bulletClass-100 lithography (conventional, holographic, and E-beam)
bulletClass-10,000 processing space

In addition, we have a dedicated teaching clean room (pictured left) for training new students.

See also Clean Room Facility and Map

Femtosecond Laser Laboratory:

bulletMode-locked Nd: YAG pumped dye laser for sub-picosecond probing of optical properties
bulletUltrahigh-bandwidth optical components--optical spectrum analyzer and a superconductive 70 GHz sampling scope

High-Resolution Photoluminescence Laboratory:

bulletAr, Kr dye and Ti-sapphire pumping lasers
bulletSingle and double monochromators
bulletComplete data acquisition
bulletRoutine 2 K-to-room temperature operation

High-Speed Measurement Laboratory:

bulletHP8510C network analyzer with capability to 110 GHz, along with a custom wafer-probing station
bulletHP 8510B 40 GHz automatic network analyzer with a Cascade Microwave Probe Station
bullet70 GHz Hypres superconducting oscilloscope
bulletHP 54121 20 GHz digitizing oscilloscope
bulletVarious spectrum analyzers, sweepers, synthesizers, power meters. 

Materials Chemistry Laboratory

bulletIn situ X-ray diffraction
bulletHigh-vacuum deposition synthesis
bulletInert atmosphere synthetic capabilities
bulletNear IR and VIS/UV transmission and diffuse reflectance spectroscopy
bulletAutoclave and hydrothermal synthesis
bulletEmission luminescence and nonlinear optic characterization
bulletSingle crystal X-ray diffraction

Molecular Beam Epitaxy (MBE) Laboratory:

bullet2 Varian modular Gen II machines with an in situ processing chamber, providing the capability for substrate reactive cleaning, etching, and maskless patterning between crystal growth sequences

Optoelectronics Device Laboratory:

bulletLaser assisted dry etching capability for material and spatially selective etching
bulletCommercial spectrophotometer
bulletElectro-optical probing station that uses tunable Ti-sapphire laser and has
bulletMillimeter bandwidth electrical probes
bulletFiber optics bench with self-heterodyne laser linewidth measurement apparatus
bulletBench for studying waveguide modulator properties

Scattering and Surface Science Laboratory

bulletAtomic and molecular beam scattering
bulletHigh-resolution electron energy loss spectroscopy
bulletFourier transform reflection-absorption IR spectroscopy
bulletScanning tunneling microscopy and spectroscopy
bulletX-ray photoelectron spectroscopy
bulletAuger electron spectroscopy
bulletLow-energy electron diffraction
bulletQuadrupole mass spectroscopy
bulletContact potential difference measurements

Semiconductor Spectroscopy Laboratory:

bulletScanning Transmission Electron Microscope
bulletLow-temperature cathodoluminescence and beam blanking capabilities
bullet2 Scanning Tunneling Microscopes
bulletA 150 keV UHV focused ion beam implanter system with vacuum-coupling capability to MBE systems and processing chamber
bulletLow-temperature magneto-transport cryostat

Surface Chemistry Laboratory:

bulletMetastable quenching electron spectroscopy
bulletUltraviolet-photoelectron spectroscopy
bulletHigh-resolution electron energy loss spectroscopy, thermal desorption spectroscopy
bulletAuger electron spectroscopy