Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Researchers Design Electronic Amplifier Capable of Functioning in Extreme Temperatures

09.03.2009
Electrical engineering researchers at the University of Arkansas have designed and successfully tested an electronic micro amplifier that can operate directly in the space environment without protection from a warm box.

Missions to space require “warm” boxes, which protect electronic circuitry from extreme temperatures and exposure to radiation. Electrical engineering researchers at the University of Arkansas have designed and successfully tested an electronic micro amplifier that can operate directly in the space environment without protection from a warm box.

Capable of functioning with consistency and stability at extreme temperatures – from 125 degrees Celsius to negative 180 degrees Celsius – the new amplifier saves power and space required for electronics circuitry and will also contribute to the development and commercial production of electronics and computer systems that do not require protection in extreme conditions and environments.

“This and several other designs focus on wide-temperature operational characteristics of sensor-based, signal-processing circuits,” said Alan Mantooth, professor of electrical engineering and holder of the Twenty-First Century Endowed Chair in Mixed-Signal IC Design and CAD. “But our device is the first fully differential amplifier circuit designed specifically for extreme temperatures, including temperatures in the cryogenic region. Some of our designs have been tested as fully operational down to 2 Kelvin, or negative 271 degrees Celsius.”

The device, made in a commercially available semiconductor process, has a power supply of 3.3 volts and uses two common-mode feedback circuits to better control the voltage of both the input stage and output stage independently. Using these techniques, the researchers were able to construct an amplifier that provides a large differential gain across both wide frequency and temperature.

In electronics and computer systems, amplifiers are small circuit devices that increase the amplitude of a signal, usually voltage or current. Differential amplifiers are a special type of amplifier that multiplies differences in voltage or current between two inputs by a constant factor. This factor is called differential gain, which is simply the measure of the ability of a circuit to increase the power or amplitude of a signal.

Fully differential amplifiers are used in a variety of electronic systems, including analog-to-digital conversion applications. They are considered a building block in the design and development of integrated electronic circuits and chips.

Under Mantooth’s direction, the researchers – electrical engineering graduate students Kimberly Cornett and Ivonne Escorcia and post-doctorate fellow Guoyuan Fu – developed a device with three distinct sections. The design consisted of an input stage, an output stage and their respective common-mode feedback circuits.

The input stage connects directly to two voltage signals of interest. The difference between the input signals is amplified in the input stage and then further amplified in the output stage. Because only the difference in the two input signals is desired, anything that is similar, or “common,” between the two signals should be cancelled.

Common-mode feedback circuitry ensures that both the input and the output stages are only amplifying the difference of the input signals and cancelling anything that is common between them. Using independent common-mode feedback circuits for input and output stages allows for more fine-tuning and a higher quality output signal.

The research was presented and published today at the IEEE Aerospace Conference in Big Sky, Mont. The conference highlights advances in aerospace technology. An electronic copy of the article is available upon request.

Matt McGowan | Newswise Science News
Further information:
http://www.uark.edu

More articles from Power and Electrical Engineering:

nachricht How protons move through a fuel cell
22.06.2017 | Empa - Eidgenössische Materialprüfungs- und Forschungsanstalt

nachricht Fraunhofer IZFP acquires lucrative EU project for increasing nuclear power plant safety
21.06.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Individualized fiber components for the world market

23.06.2017 | Physics and Astronomy

How brains surrender to sleep

23.06.2017 | Life Sciences

Can we see monkeys from space? Emerging technologies to map biodiversity

23.06.2017 | Information Technology

VideoLinks
B2B-VideoLinks
More VideoLinks >>>