Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Innovative Wideband Ring Voltage-Controlled oscillator (VCO) by UNIST undergraduate

08.10.2013
A Korean undergraduate student at UNIST (Ulsan National Institute of Science and Technology) developed a new wideband ring voltage-controlled oscillator (VCO), which is a key component of an IR-UWB (Impulse Radio Ultra-wideband) Radar system.

A new wideband ring voltage-controlled oscillator (VOC)* was proposed by UNIST undergraduate student, Seyeon Yoo with the the research work published in IEEE Microwave and Wireless Components Letters.

*VCO (voltage-controlled oscillator) : an electronic oscillator whose oscillation frequency is controlled by a voltage input. The applied input voltage determines the instantaneous oscillation frequency.

Wideband VCO is a key component of an IR-UWB system (Impulse radio-Ultra-wideband) which has drawn attention as a practical technology for a Doppler radar* system which can detect human vital signs such as heart beats and respiration.

*Doppler radar: a specialized radar that makes use of the Doppler effect* to produce velocity data about objects at a distance.

The IR-UWB’s large signal bandwidth can yield an increased time resolution and its wide range of frequency bands is desirable because an optimal band can be selectively used to maximize detection accuracy.

With the new VCO designed by the UNIST research team led by Prof. Jaehyouk Choi and proposed by a UNIST undergraduate student, Seyeon Yoo, an operating frequency band is digitally set using a digital-to-analog convert (DAC) in the supply-voltage regulator.

Once a band is selected, the specific target-frequency is analogously tuned, controlling the strength of latches in delay cells. Furthermore, by storing the latches in each cell, the KVCO becomes scalable.

Ultimately, throughout the entire 2-8 GHz frequency band, the KVCO can be constantly maintained, which helps ensure the stable operation of the phase-locked loop* (PLL).

*phase-locked loop: a control system which generates an output signal whose phase is related to the phase of input signal.

“This technology will be applicable for IR-UWB based Doppler radar systems and various radio frequency (RF) semiconductor applications since it provides stable wideband frequency,” said Prof. Choi.

He also specially praised Yoo: “Developing an analog/RF integrated circuit (IC) chip requires extensive knowledge and know-how on IC designs. As an undergraduate student, developing a new IC and publishing a research paper in a leading science journal is a remarkable performance.”

This research work was supported by a grant from the Ulsan Technopark, Korea.

For more information:
Prof. Choi jaehyouk Choi
School of Electrical and Computer Engineering http://ece.unist.ac.kr/index.sko
Ulsan National Institute of Science and Technology (UNIST) http://www.unist.ac.kr
Homepage of Prof. Jaehyouk Choi http://icsl.unist.ac.kr/
The original press release can be found at
https://www.unist.ac.kr/board/view.sko?boardId=Notice&boardSid=5037&menuCd
=AB07002001000&contentsSid=8297&orderBy=register_dt&startPage=1&searchType
=&keyword=&searchStartDt=&searchEndDt=&dataSid=2400049

Journal information
IEEE Microwave and Wireless Components Letters

Eunhee Song | Research asia research news
Further information:
http://www.unist.ac.kr

More articles from Information Technology:

nachricht Terahertz spectroscopy goes nano
20.10.2017 | Brown University

nachricht New software speeds origami structure designs
12.10.2017 | Georgia Institute of Technology

All articles from Information Technology >>>

The most recent press releases about innovation >>>

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

Im Focus: Neutron star merger directly observed for the first time

University of Maryland researchers contribute to historic detection of gravitational waves and light created by event

On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...

Im Focus: Breaking: the first light from two neutron stars merging

Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.

Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....

Im Focus: Smart sensors for efficient processes

Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).

When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...

Im Focus: Cold molecules on collision course

Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.

How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...

Im Focus: Shrinking the proton again!

Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.

It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ASEAN Member States discuss the future role of renewable energy

17.10.2017 | Event News

World Health Summit 2017: International experts set the course for the future of Global Health

10.10.2017 | Event News

Climate Engineering Conference 2017 Opens in Berlin

10.10.2017 | Event News

 
Latest News

Terahertz spectroscopy goes nano

20.10.2017 | Information Technology

Strange but true: Turning a material upside down can sometimes make it softer

20.10.2017 | Materials Sciences

NRL clarifies valley polarization for electronic and optoelectronic technologies

20.10.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>