Innovative wideband ring voltage-controlled oscillator (VCO)

Oct 08, 2013
UNIST undergraduate Seyeon Yoo is majoring in the School of Electrical and Computer Science, UNIST. Credit: UNIST

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 .

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 , Seyeon Yoo, an operating 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."

Explore further: X-ray detector on plastic delivers medical imaging performance

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

FCC to propose pay-for-priority Internet standards

8 minutes ago

The Federal Communications Commission is set to propose new open Internet rules that would allow content companies to pay for faster delivery over the so-called "last mile" connection to people's homes.

SK Hynix posts Q1 surge in net profit

8 minutes ago

South Korea's SK Hynix Inc said Thursday its first-quarter net profit surged nearly 350 percent from the previous year on a spike in sales of PC memory chips.

Brazil enacts Internet 'Bill of Rights'

28 minutes ago

Brazil's president signed into law on Wednesday a "Bill of Rights" for the digital age that aims to protect online privacy and promote the Internet as a public utility by barring telecommunications companies ...

Zynga founder Pincus leaving operations role

11 hours ago

Online game maker Zynga says company founder Mark Pincus is stepping down as chief product officer, less than a year after he was replaced as the company's CEO.

User comments : 0

More news stories

Brazil enacts Internet 'Bill of Rights'

Brazil's president signed into law on Wednesday a "Bill of Rights" for the digital age that aims to protect online privacy and promote the Internet as a public utility by barring telecommunications companies ...

Is nuclear power the only way to avoid geoengineering?

"I think one can argue that if we were to follow a strong nuclear energy pathway—as well as doing everything else that we can—then we can solve the climate problem without doing geoengineering." So says Tom Wigley, one ...

US urged to drop India WTO case on solar

Environmentalists Wednesday urged the United States to drop plans to haul India to the WTO to open its solar market, saying the action would hurt the fight against climate change.

FDA proposes first regulations for e-cigarettes

The federal government wants to prohibit sales of electronic cigarettes to minors and require approval for new products and health warning labels under regulations being proposed by the Food and Drug Administration.

Vermont moves toward labeling of GMO foods

Vermont lawmakers have passed the country's first state bill to require the labeling of genetically modified foods as such, setting up a war between the behemoth U.S. food industry and an American public that overwhelmingly ...