A5077334973- Radio Frequency Integrated Circuit Design
- Optical Wireless Communication Technologies
- Microwave Engineering and Waveguides
- Satellite Communication Systems
- Gas Sensing Nanomaterials and Sensors
- Advanced Power Amplifier Design
- Microgrid Control and Optimization
- Advanced Photonic Communication Systems
- ZnO doping and properties
- BIM and Construction Integration
- Thin-Film Transistor Technologies
- Advanced DC-DC Converters
- Semiconductor Quantum Structures and Devices
- Luminescence Properties of Advanced Materials
- Electromagnetic Compatibility and Noise Suppression
- GaN-based semiconductor devices and materials
- Islanding Detection in Power Systems
- Dielectric materials and actuators
- Telecommunications and Broadcasting Technologies
- Semiconductor materials and devices
- Simulation and Modeling Applications
- Photonic and Optical Devices
- Multilevel Inverters and Converters
- Power Quality and Harmonics
- Manufacturing Process and Optimization
Samsung (South Korea)
2023-2024
Pohang University of Science and Technology
2021-2023
National Institute of Agricultural Science and Technology
2022
Konkuk University
2012
Kyungnam University
2011
Kyungdong University
2002-2008
Sogang University
2008
Osaka University
2008
Hanyang University
2004-2006
Microparticle aligned-stretchable anisotropic conductive film enables high-resolution stretchable circuit lines to interconnect.
Parallel operation of UPS system has been used to increase power capacity the or secure reliable supply critical loads. During parallel operation, load sharing control maintain current balance is for since very sensitive differences in components each module such as amplitude /phase difference, line impedance, and output LC filters. To solve these problems various algorithms have researched. However, methods cannot be applied systems with different ratings. For this case, master slave...
Stacked-FET topology is analyzed to increase the output power of a amplifier (PA) in millimeter-wave (mm-wave) band. In mm-wave band, parasitic capacitances transistor severely degrade stacking efficiency due phase mismatch between stacked FETs. The phase-compensation (PC) inductances, including losses inductor for best efficiency, are presented both series and shunt connections. From this analysis, triple-stacked-FET PA designed <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We present a 40-nm CMOS 70-GHz frequency quadrupler based on phase-controlled push-push (PCPP) topology that provides high efficiency and harmonic suppression. Since MOSFETs in the PCPP stack turn off alternately, can provide energy even for fourth-order multiplication. One major problem related to even-order suppression was mitigated by using transformer-based output amplifier with no degradation efficiency. The fabricated 3-dB bandwidth peak power of 65.6-75.2 GHz -0.2 dBm at 70 GHz,...
We present a novel high-gain broadband <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$G_{\mathrm {max}}$ </tex-math></inline-formula> -core amplifier with T-shaped passive embedding network consisting of two series capacitors and one shunt inductor. The proposed has dual-peak properties. By staggering -cores, broad gain–bandwidth can be achieved small number stages. In addition, the three elements give us...
A 115.7–139.7 GHz low noise amplifier (LNA) is presented. The neutralization capacitance chosen to minimize the tradeoff between achievable gain and figure. Based on fourth-order matching network, interstage transformers are designed, an filtering transformer reduces at frequencies, resulting in a flat bandwidth overall. five-stage LNA provides peak gain, bandwidth, figure of 19.7 dB, 24 GHz, 7.9 respectively. presented achieves highest gain-bandwidth product 231.9 with small DC power...
This letter presents a wideband two-stage full Ka-band power amplifier (PA) with transformer-based matching networks (TMNs) in 28-nm CMOS fully depleted silicon on insulator (FD-SOI) technology. By considering the loss of transformer, which has usually been ignored previous works, methods to compensate for nonflat gain TMNs are studied and based that, initial guess design is extracted. Wideband performance terms output delivered by designing PA frequency-independent optimum load selection...
We have studied the properties of Ag/undoped ZnO (ZnO) multilayer thin films deposited on glass substrates by facing target sputtering. In an attempt to determine optimum conditions Ag film, which would be coated we investigated changes in sheet resistance, transmittance, and surface morphology as functions varying deposition time substrate temperature. The electrical optical characteristics Ag/ZnO multilayers were evaluated using a four-point probe, UV/visible (vis) spectrometer with...
Rich experience and intuition play important roles in designing planar transformers (TFs) for contemporary radio frequency integrated circuits (RFICs). In general, RFIC designers have been heavily relying on multiple iterations of full electromagnetic (EM) simulations, which consumes much time effort. Here, we propose an automated matching circuit synthesizer (AMCS) using neural networks (NNs). The proposed AMCS directly synthesizes a combined with TF throughout the entire design process,...
Adaptive back-gate control of a stacked-FET power amplifier (PA) in 28-nm fully depleted silicon-on-insulator (FD-SOI) CMOS is demonstrated for the 64-QAM signal at 28 and 31 GHz. bias (ABC) applied to back gate effectively enhance linearity PAs wideband waveforms with up an 800-MHz envelope frequency. Third-order intermodulation distortion (IMD3), which degrades PA, improved by adjusting biases PA according input level without any concerns about operation. From 34 GHz, presented provides P...
We present a 66–79-GHz transmitter (TX) in 40-nm CMOS technology for radar and communication (RadCom) systems. To accommodate the technical requirements RadCom systems, such as wideband operation with high linearity, compact TX was implemented stacked-FET power amplifier (PA), upconverting passive mixer, phase-controlled push–push frequency quadrupler. The exhibits OP <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1dB</sub> bandwidth of 13.0...
In order to achieve the good load sharing performance in parallel operation of a three-phase UPS inverter system, this paper describes control method with an current feed-forward compensator including design criteria for choosing gain. Especially, discussed about harmonic circulating due PWM non-synchronization which disturbs precision and creates noise problem system. The proposed schemes related algorithm is very simple be implemented using DSP, also it satisfy inverters. Experimental...
Radio on free space optics (RoFSO) is being developed to realize a cost effective and universal platform for heterogeneous wireless services as same RoF. The RoFSO transceiver can directly transmit some RoF signals from an optical fiber receive signal air into core. It achieve that transparent various types of in beam. This paper describes the features equipments, propose link budget design WLAN terrestrial digital broadcasting services.
This paper presents a variable-gain amplifier (VGA) in the 68–78 GHz range. To reduce DC power consumption, drain voltage was set to 0.5 V with competitive performance gain and noise figure. High-Q shunt capacitors were employed at gate terminal of core transistors move input matching points for easy compact transformer. The four stages fabricated 40-nm bulk complementary metal oxide semiconductor (CMOS) showed peak 24.5 dB 71.3 3‑dB bandwidth more than 10 range approximately 4.8-mW...
Radio on free space optics (RoFSO) is being developed to realize a cost effective and universal platform for heterogeneous wireless services as same RoF. The RoFSO transceiver can directly transmit some RoF signals from an optical fiber receive signal air into core. It achieve various types of in beam like fiber. This paper describes the features equipments, propose link budget design WLAN terrestrial digital broadcasting services.