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 reports about: > Amplifier > Capable > Design Thinking > Electrical > Electronic Amplifier Capable > Electronic Systems > Functioning > Mixed-Signal IC Design > computer systems > electrical engineering > electronic micro amplifier > semiconductor process > signal-processing circuits > temperatures > warm box
Electron sandwich doubles thermoelectric performance
20.06.2018 | Hokkaido University
Agrophotovoltaics Goes Global: from Chile to Vietnam
20.06.2018 | Fraunhofer-Institut für Solare Energiesysteme ISE
In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.
Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...
Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
An international team of scientists has discovered a new way to transfer image information through multimodal fibers with almost no distortion - even if the fiber is bent. The results of the study, to which scientist from the Leibniz-Institute of Photonic Technology Jena (Leibniz IPHT) contributed, were published on 6thJune in the highly-cited journal Physical Review Letters.
Endoscopes allow doctors to see into a patient’s body like through a keyhole. Typically, the images are transmitted via a bundle of several hundreds of optical...
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
20.06.2018 | Materials Sciences
20.06.2018 | Materials Sciences
20.06.2018 | Materials Sciences