MEMs

Reflected Signal Analysis

Forensic characterization of a wireless device is useful in many applications. An example of this is in the testing of Federal Communications Commission (FCC) Part 15 devices that must adhere to strict guidelines with regard to RF interference; one reason being problems with Portable Electronic Devices (PEDs) carried onboard aircraft. The operation of PEDs aboard U.S.-registered civil aircraft is limited. These rules also permit the use of specific PEDs after the aircraft operator has determined that the PED will not interfere with the operations of the aircraft. However, how can the aircraft operator know which PEDs are approved, or if the approved devices are being operated at inappropriate times? Compliance can be verified by detecting the operation of transmitting PEDs (T-PEDs) using an onboard monitoring system, or it could be verified by characterizing the device at a gate entry point, whether powered on or off, using specially designed probe signals and forensic techniques to classify the returned signal. In a more general setting, forensic characterization allows determination of the type of device, make, model, configuration, and other characteristics based on observation of the data that the device produces. The unique characteristics of the device are known as device signatures or device fingerprints.

Posted in: Briefs, Electronics & Computers, Electromagnetic compatibility, Wireless communication systems, Aircraft operations, Regulations, Identification
Read More >>

Analysis of Clustering Tools for Moving Target Indication

Current and future forces operating in urban environments need the capability to detect slow-moving personnel inside buildings. To accomplish this, a time-domain approach was developed that uses a low-frequency, ultra-wideband (UWB) radar with a transmit pulse capable of penetrating through the wall. The UWB corresponds to a high-range resolution that gives the capability to better locate the moving target (MT). Previously, the effectiveness of a time-domain, moving target indication (MTI) approach was demonstrated for detecting moving personnel inside wood and cinderblock structures, moving personnel walking in nonlinear trajectories, and multiple moving personnel walking in linear trajectories.

Posted in: Briefs, Electronics & Computers, Mathematical models, Imaging, Radar, Military vehicles and equipment
Read More >>

Threshold Voltage Tuning of Metal-Gate MOSFETs Using an Excimer Laser

This work presents a localized method for tuning the threshold voltages (Vt) of multilayer metal-gate metal-oxide-semiconductor field-effect transistor (MOSFET) devices with a spatial area theoretically limited by the wavelength of the laser beam. This technique allows an independent means to tailor threshold voltage on a device-to-device basis that provides greater design flexibility. This maskless technique allows tailoring of thresholds by tuning the work function of the gate by intermixing titanium and titanium nitride using a laser pulse. The source and drains of the MOSFET are simultaneously annealed by the laser.

Posted in: Briefs, Photonics, Calibration, Lasers, Semiconductor devices, Transistors, Titanium
Read More >>

Development of GaN-Based Nanostructure Photon Emitters

Gallium nitride (GaN)-based wide bandgap semiconductors are very important material systems for fabrication of photon emitters in a wide range of wavelengths. In particular, the light emitters in ultraviolet (UV), blue, and green wavelengths have been developed and demonstrated in recent years. Besides these UV and visible light emitters, the unique properties of a GaN material system such as large exciton energy and large LO phonon energy, have been proposed as a very suitable material candidate for realization of various photon emitters such as single-photon emitters, LEDs, vertical cavity surface emitting lasers (VCSELs), and quantum cascade lasers (QCL) at room temperature.

Posted in: Briefs, Photonics, Lasers, Fabrication, Materials properties, Semiconductors
Read More >>

Polymer Coating Material Limits Computer Damage Caused by Vibrations

Cornerstone Research Group (Dayton, OH) has developed an organic, polymer-based material that can be directly applied to any circuit board — as well as other metal- and plastic-based objects — to protect against vibrations.

Posted in: Tech Transfer Reports, Coatings & Adhesives
Read More >>

Source Code Analysis Tool

AdaCore (New York, NY) has released CodePeer, a source code analysis tool that detects run-time and logic errors in Ada programs. Serving as an efficient code reviewer, CodePeer identifies constructs that are likely

to lead to run-time errors such as buffer overflows, and it flags legal but suspect code typical of logic errors. CodePeer also produces a detailed analysis of each subprogram, including pre- and postconditions, making it easier to find potential bugs and vulnerabilities early. If the implicit specification deduced by CodePeer does not match the component’s requirements, a reviewer is alerted immediately to a likely logic error.

Posted in: Products, Products, Embedded Technology, Board-Level Electronics, Electronics & Computers
Read More >>

Fanless Industrial Panel PC

The IPPC-8151S from Advantech (Cincinnati, OH) is a 15" XGA TFT LCD fanless industrial panel PC that features an Intel Celeron®M 1GHz CPU. It includes a tapered and food-safe rubber seal between the bezel and the chemical-resistant touch screen, and an optional fully sealed 316L stainless steel enclosure to satisfy the standards required in food processing, clinical, chemical, or pharmaceutical applications. For waterproof and dust-proof protection, the standard model supports IP66 grade protection on the front panel only, while an optional stainless steel enclosure kit and IP66 I/O module are available to support a fully enclosed IP66 protection for all sides, including I/O ports. The system includes a 1MB L2 cache, 1GB DDR2 memory, a CompactFlash slot, one PCI expansion, and one SATA HDD.

Posted in: Products, Products, Embedded Technology, Board-Level Electronics, Electronics & Computers
Read More >>

Designing and Implementing COM Express Modules

Computer-on-Module Express (COM Express) has become a widely accepted way to implement embedded computing solutions in a very compact form factor. The main principle of the COM Express standard is to implement the processor and memory on a small module (basic module size for the type 2 specification is 125 × 95 mm) and then implement specific functions and interfaces for a particular application on the baseboard.

Posted in: Products, Articles, Products, Embedded Technology, Board-Level Electronics, Electronics & Computers
Read More >>

CompactDAQ Chassis

National Instruments (Austin, TX) has introduced the NI cDAQ-9174 four-slot and cDAQ-9178 eight-slot NI CompactDAQ chassis, suitable for mixed-signal data acquisition systems. The 9174 offers a smaller footprint and can measure up to 128 channels in a 16cm × 9cm x 9cm system. The 9178 features external BNC triggers to synchronize with an external device or another system without installing or wiring a digital module. Both systems contain four advanced counters and operate in temperatures from -20 to 55°C. They can withstand up to 30g shock and 3g vibration.

Posted in: Products, Products, Electronics & Computers
Read More >>

Real-Time Avionics Operating System

The ThreadX® real-time operating systems from Express Logic (San Diego, CA) have been integrated into Avidyne Corporations' DFC90 attitude-based digital flight control systems in Cirrus SR20 and SR22 aircraft. The DFC90 is an integrated flight computer and control panel designed as a slide-in replacement for existing rate-based STEC 55X flight computers. The DFC90 flight control system receives input regarding the aircraft’s attitude, heading, and altitude, as well as input from the pilot and navigation system that specify the desired attitude, heading, altitude, and rate of climb/descent. As the operating system powering Avidyne's flight control system, ThreadX controls all functions in the DFC90.

Posted in: Products, Products, Electronics & Computers
Read More >>