A5021629993- Analytical Chemistry and Sensors
- Photonic and Optical Devices
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Advanced Chemical Sensor Technologies
- Advanced Fiber Optic Sensors
- Quantum Dots Synthesis And Properties
- Gas Sensing Nanomaterials and Sensors
- Radio Frequency Integrated Circuit Design
- Advanced biosensing and bioanalysis techniques
- Perovskite Materials and Applications
- Organic Light-Emitting Diodes Research
- Thin-Film Transistor Technologies
- Nanowire Synthesis and Applications
- Semiconductor Lasers and Optical Devices
- Anodic Oxide Films and Nanostructures
- Microwave Engineering and Waveguides
- Advanced Sensor and Energy Harvesting Materials
- Molecular Junctions and Nanostructures
- Chalcogenide Semiconductor Thin Films
- Millimeter-Wave Propagation and Modeling
- Nanofabrication and Lithography Techniques
- Electrochemical sensors and biosensors
- Photonic Crystals and Applications
- Photochromic and Fluorescence Chemistry
Sungkyunkwan University
2023
Kyungpook National University
2011-2020
Intel (United States)
2018
University of California, Berkeley
2010-2015
Pusan National University
1997-2009
Korea Basic Science Institute
2007
KG Chemical (South Korea)
2006
Keio University
1992-1993
Max Planck Institute of Molecular Physiology
1978
A fully integrated 260GHz OOK transceiver is demonstrated in 65nm CMOS. Communication at 10Gb/s has been verified over a range of 40 mm. The Tx/Rx dual on-chip antenna array implemented with half-width leaky wave antennas. Each Tx consists quadrupler driven by class-D <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> PA distributed modulator, and outputs +5 dBm EIRP. Rx uses double balanced mixer to down-convert V-band IF signal that...
In this paper, a 240 GHz 16 Gbps QPSK transmitter is demonstrated in 65 nm bulk CMOS process. The chain employs an 80 local oscillator and modulator to generate the data that amplified by class-E switching power amplifier. signal then drives tripler required modulated data. By using on-chip slotted loop antennas, achieves EIRP of 1 dBm. A maximum rate achieved with efficiency 14 pJ/bit.
Operation at millimeter-wave/sub-terahertz frequencies allows one to realize very high data-rate transceivers for wireless chip-to-chip communication. In this paper, a 240 GHz 16 Gbps QPSK receiver is demonstrated in 65 nm CMOS technology. The employs direct-conversion mixer-first architecture with an integrated slotted loop antenna. A LO chain drives the passive mixers down-convert modulated data baseband. baseband signal then amplified using gain, wide bandwidth amplifiers. has noise...
High-resolution mm-wave array beamformers have applications in medical imaging, gesture recognition, and navigation. A scalable architecture for 3D imaging is proposed which single-element phase coherent transceiver (TRX) chips, with programmable TX pulse delay capability, are mounted on a common board to realize the array. This paper presents design of enabling TRX chip: highly integrated 94 GHz phase-coherent pulsed-radar on-chip antennas. The achieves 10 frequency tuning range 300 ps...
This paper describes a low power and element-scalable 60 GHz 4-element phased array transceiver implemented in standard 65 nm CMOS process. Using 1.2 V supply, the consumes <;34 mW/element including LO synthesis distribution. Energy area efficiency are achieved by utilizing baseband phase shifting architecture, holistic impedance optimization, lumped-element based design. Each receiver (RX) element provides 24 dB of gain with an average noise figure (NF) 6.8 while total saturated output...
Abstract Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is most commonly used as an anode buffer layer in bulk-heterojunction (BHJ) polymer solar cells (PSCs). However, its hygroscopic and acidic nature contributes to the insufficient electrical conductivity, air stability restricted photovoltaic (PV) performance for fabricated PSCs. In this study, a new multifunctional additive, 2,3-dihydroxypyridine (DOH), has been PEDOT: PSS obtain modified properties PSS@DOH achieve...
We proposed a poly-dimethylsiloxane (PDMS)-coated fiber Bragg grating (FBG) temperature sensor for enhancing sensitivity. By embedding the bare FBG in temperature-sensitive elastomeric polymer, sensitivity of structure could be effectively improved by 4.2 times higher than those conventional bare-type sensors due to high thermal expansion coefficient PDMS. analyzed temperature-sensitivity enhancement effect with increased wavelength shift our and dependence on respect cross-section area
A fully integrated transceiver operating at 0.38 terahertz (THz) has been demonstrated in 0.13 <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\mu$</tex> </formula> m SiGe BiCMOS with Notation="TeX">$f _{T} =$</tex></formula> 230 GHz. We present a quadrature push-push harmonic circuitry consisting of the clamping pairs driven by balanced LO signals coupled through transformers and Coplanar Stripline...
A W-band fundamental phase-locked loop (PLL) is designed and fully integrated to achieve high output power low noise in a 0.13-μm SiGe BiCMOS process. PLL with voltage-controlled oscillator (VCO) chosen after comparing several frequency-synthesizer architectures. Local (LO) generation LO distribution are also considered. The employed free-running VCO achieves tuning range from 92.5 102.5 GHz (8.3%), an of 6 dBm, phase -124.5 dBc/Hz at 10-MHz offset. locking the 92.7 100.2 GHz, -102 1-MHz...
We propose a design for highly sensitive biosensor based on nanostructured anodized aluminum oxide (AAO) substrates. A gold-deposited AAO substrate exhibits both optical interference and localized surface plasmon resonance (LSPR). In our sensor, application of these disparate properties overcomes problems limited sensitivity, selectivity, dynamic range seen in similar biosensors. fabricated uniform periodic nanopore lattice templates by two-step anodizing assessed their suitability...
We demonstrate the first-ever surface modification of green CdSe/ZnS quantum dots (QDs) using bromide anions (Br-) in cetyl trimethylammonium (CTAB). The Br- ions reduced interparticle spacing between QDs and induced an effective charge balance QD light-emitting devices (QLEDs). fabricated QLEDs exhibited efficient injection because emission quenching effect their enhanced thin film morphology. As a result, they maximum luminance 71,000 cd/m2 external current efficiency 6.4 cd/A, both...
In this paper, we propose fast, highly sensitive, and wide-dynamic-range fiber-optic probe-type biosensors to detect pH glucose. The operation principle of the proposed is based on Fabry-Perot interferometry technique. Three pH-sensitive dyes (methyl orange, methyl red, thymol blue) three solvatochromic (Nile rhodamine-B, 4-amino-N-methylphthalimide) were individually mixed with polymers obtain five pHand glucose-sensitive sensing membranes. These membranes subsequently deposited eight gold...
We demonstrated a novel selective chemical sensing approach by incorporating poly(dimethylsiloxane) (PDMS)-coated fiber Bragg grating (FBG) structure for optically detecting various volatile organic compounds (VOC's). When the proposed is exposed to nonpolar solvent, tensile stress induced between coated PDMS and optical VOC-dependent swelling effect of PDMS, which results in wavelength shift dependent on concentration type VOC's. Because no need an etching process cladding, PDMS-coated FBG...
In this paper, we propose an AlGaN/GaN high electron mobility transistor (HEMT)-based biosensor for the detection of C-reactive protein (CRP) using a null-balancing circuit. A circuit was used to measure output voltage sensor directly. The proposed varied by antigen-antibody interactions on gate surface due CRP charges. HFET-based with applied shows that can be detected in wide range concentrations, varying from 10 ng/mL 1000 ng/mL. X-ray photoelectron spectroscopy carried out verify...