Electronics & Software

Electrical/Electronics

Briefs : Electronics & Computers
Network for Forecasting Weather and Diffusion of Toxins

The Meteorological Range Safety Support System/Eastern Range Dispersion Assessment System (MARSS/ERDAS) is a system of interconnected computer workstations designed to acquire, process, and disseminate nearly real-time meteorological data and outputs of mathematical models of the...

Briefs : Electronics & Computers
Improved Model of Spectral Response of an HEB Mixer

An improved mathematical model enables the somewhat more accurate prediction of the spectral response of a mixer circuit (see figure) that comprises a twin-slot antenna coupled via coplanar waveguides to a hot-electron bolometer (HEB). The development of the improved model is part of a...

Briefs : Electronics & Computers
Improved Charge-Termination Technique for Lithium-Ion Cells

An improved charge-termination technique has been developed to obtain a more accurate balance between charge and discharge of rechargeable lithium-ion-based electrochemical cells and batteries. The technique has been demonstrated experimentally and is now in use in a laboratory battery...

Briefs : Electronics & Computers
Equipment for On-Wafer Testing at Frequencies Up to 220 GHz

A suite of electronic test equipment has been developed for use in the measurement of key electrical characteristics of advanced, high-speed integrated circuits for communications, radar, digital networks, imaging systems, and other applications. More specifically, the test equipment is...

Briefs : Electronics & Computers
Ultra-Efficient Ka-Band MMIC Power Amplifier

A proposed monolithic microwave integrated circuit (MMIC) power amplifier has been designed to operate at frequencies around 28 GHz. According to a computer simulation of performance, this amplifier would operate at a power-added efficiency of more than 60 percent, which is more than 20 percent above...

Briefs : Electronics & Computers
Implementing Permutation Matrices by Use of Quantum Dots

Integrated circuits of a proposed type based on quantum-dot cellular automata (QCA) would implement permutation matrices. These circuits would serve as prototype building blocks for demonstrating the feasibility of quantum-dot-based computing and for the further development of increasingly...

Briefs : Electronics & Computers
Current-Signature Sensor for Diagnosing Solenoid Valves

The "smart" current-signature sensor is an instrument that noninvasively measures and analyzes steady-state and transient components of the magnetic field of (and, thus, indirectly, the electric current in) a solenoid valve during normal operation. The instrument is being developed to...

Briefs : Electronics & Computers
Si Microsensor Baseplates With Low Parasitic Capacitances

An improved design for baseplates in silicon microsensors reduces parasitic capacitances between adjacent coplanar electrodes. It also reduces thermal-expansion mismatches, which are present in baseplates of older design.

Briefs : Electronics & Computers
Improvements in a Fast Transient-Voltage Recorder

Some improvements have been made in an instrument designed expressly for recording lightning-induced transient voltages on power and signal cables. The instrument as it existed prior to the improvements was described in "Fast Transient-Voltage Recorder" (KSC-11991), NASA Tech Briefs, Vol. 23,...

Briefs : Electronics & Computers
Improved Field-Emission Cathodes

Microscopic cathodes based on field emission (in contradistinction to thermionic emission) are undergoing development with a view toward using them as miniature or scalable sources of electrons in diverse applications that could include spacecraft thrusters, semiconductor-fabrication equipment, flat-panel...

Briefs : Electronics & Computers
The Future of Electronic Device Design

An article discusses anticipated advances in the design of increasingly capable integrated circuits containing ever smaller electronic devices. The article emphasizes the emergence of technology computer-aided design (TCAD) — a discipline in which computer-aided design is combined with computational...

Briefs : Electronics & Computers
The NASA Spacecraft Transponding Modem

A report describes the NASA Spacecraft Transponding Modem (STM) — a spacecraft transponder now under development for planned use on deep-space missions scheduled for launch in the year 2003. In comparison with a traditional deep-space transponder, the STM will be smaller and less power hungry; the...

Briefs : Electronics & Computers
Analog VLSI Circuits for Hebbian Learning in Neural Networks

An analog very-large-scale integrated (VLSI) circuit was designed and built to implement Hebbian synapses with an improved method of modifying and storing the synaptic weights, for use in neural-network circuits. (In Hebbian synapses, the synaptic weights are modified through Hebbian...

Briefs : Electronics & Computers
Design of a Highly Reliable Controller for an I2C Bus

The design of a highly reliable controller for a digital data bus incorporates improvements, in both hardware and software, over the basic design of a low-speed, low-power, serial bus known in the industry as "I2C." ("I2C" signifies "inter integrated circuit bus" — a...

Briefs : Electronics & Computers
Compact, Rugged Enclosure for PC-Based Electronic Circuits

Figure 1 depicts a compact enclosure enabling the operation of personal-computer (PC)-based electronic circuits in harsh environments. The electronic circuits in question are commercial off-the-shelf Industry Standard Architecture (ISA) and Extended Industry Standard Architecture (EISA)...

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