A5101419638- Radio Frequency Integrated Circuit Design
- Aerodynamics and Fluid Dynamics Research
- Fluid Dynamics and Vibration Analysis
- Fluid Dynamics and Turbulent Flows
- Microwave Engineering and Waveguides
- Advancements in PLL and VCO Technologies
- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Photonic and Optical Devices
- Air Quality and Health Impacts
- Aerodynamics and Acoustics in Jet Flows
- Data Management and Algorithms
- Advanced Power Amplifier Design
- Wind and Air Flow Studies
- Hydrocarbon exploration and reservoir analysis
- Analog and Mixed-Signal Circuit Design
- Full-Duplex Wireless Communications
- Vehicle emissions and performance
- Caching and Content Delivery
- Advancements in Semiconductor Devices and Circuit Design
- Human Mobility and Location-Based Analysis
- Atmospheric and Environmental Gas Dynamics
- Acoustic Wave Phenomena Research
- Aerospace Engineering and Energy Systems
- Rocket and propulsion systems research
University of Chinese Academy of Sciences
2023
Institute of Atmospheric Physics
2020-2023
Chinese Academy of Sciences
2020-2023
Lehigh University
2018-2022
MediaTek (Taiwan)
2019
National Taiwan University
2010-2018
National Cheng Kung University
2012-2016
National Yang Ming Chiao Tung University
2009
Abstract. A new long-term emission inventory called the Inversed Emission Inventory for Chinese Air Quality (CAQIEI) was developed in this study by assimilating surface observations from China National Environmental Monitoring Centre (CNEMC) using an ensemble Kalman filter (EnKF) and Nested Prediction Modeling System. This contains constrained monthly emissions of NOx, SO2, CO, primary PM2.5, PM10, non-methane volatile organic compounds (NMVOCs) 2013 to 2020, with a horizontal resolution 15...
A soaring amount of data transfer has been witnessed in recent years. By 2020, 50 billion connected devices are expected, which will generate more than 2 zettabytes traffic annually. Given the constraints power & space, this explosive growth puts high stress on network infrastructure, demands low power, BW, and area efficient transceivers. To improve BW efficiency, modern transceivers use PAM-4 instead NRZ to double throughput same BW. However, introduces substantial ISI, reduces...
In recent years, research on location-based services has received a lot of interest, in both industry and academia, due to wide range potential applications. Among them, one the active topic areas is constraint-based route planning point-of-interest (POI) network. Most previous studies this primarily consider geographic properties POIs route. However, we that reason user visits POI it provides some needs. particular, urban environments, may provide various kinds services. Hence, user's...
A new long-term emission inventory called the Inversed Emission Inventory for Chinese Air Quality (CAQIEI) was developed in this study by assimilating surface observations from China National Environmental Monitoring Centre (CNEMC) using an ensemble Kalman filter (EnKF) and Nested Prediction Modeling System. This contains constrained monthly emissions of NOx , SO2 CO, primary PM2.5, PM10, non-methane volatile organic compounds (NMVOCs) 2013 to 2020, with a horizontal resolution 15 km...
A low-power frequency tripler is designed by using the sub-harmonic mixer configuration for K-band applications. The proposed circuit features quadrature signal generation, applicable to LO synthesis in millimeter-wave wireless transceivers. It achieves conversion gain of -5.7 dB at output 21 GHz. Implemented a 0.18 mum CMOS technology, consumes power 7.5 mW with 1.5 V supply voltage. entire die occupies an area 1000times1050 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, a novel circuit topology of CMOS divide-by-4 direct injection-locked frequency divider is presented for millimeter-wave applications. To enhance the locking range operations with division ratio 4, series peaking technique introduced in proposed structure such that improved input injection efficiency can be achieved. Using standard 0.18-μm process, <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> -band fabricated demonstration....
A 5.2-GHz fully-integrated RF front-end combining the design of a T/R switch, an LNA, and PA is presented for single-chip solution on CMOS. Based concept circuit co-design, components are properly reused in order to minimize signal losses chip area. The proposed requires no off-chip while demonstrates NF 3.2 dB receive mode, saturated output power +25.9 dBm transmit mode by using standard 90-nm CMOS process.
In this paper, a direct up-conversion mixer with wide intermediate frequency (IF) bandwidth is designed and fabricated for 60-GHz applications. The up-converted differential signal transformed to single-ended through an on-chip balun. addition, injection-locked tripler integrated local oscillator generation. measured results shows the maximum conversion gain of -5.6 dB, input-referred 1-dB compression point (IP1dB) -14 dBm, third-order intercept (IIP3) -4 3-dB IF 3.5 GHz. proposed using...
In this paper, a transimpedance amplifier (TIA) with tunable 3-dB bandwidth is presented for optical communications. The proposed TIA composed of two cascaded stages in which an input network inductive peaking elements employed the first stage broadband operations while modified distributed utilized as second enhanced gain. addition, feedback loop incorporated bandwidth-tuning mechanism. By tuning TIA, optimum circuit operation lowest bit error rate (BER) can be achieved receiver frontend...
A CMOS transmitter frontend integrated circuit suitable for 24-GHz frequency-modulated continuous-wave (FMCW) radar applications is presented in this paper. With a transformer-based power-combining technique and pseudo-differential class-AB power amplifiers (PAs), the proposed exhibits enhanced output efficiency at nominal supply voltage. In addition, voltage-controlled oscillator incorporated frequency modulation purposes while differential are utilized as driver stages PAs to facilitate...
A 5.5-GHz multi-mode PA with a reconfigurable output matching network which enables near-optimal impedances for size-scaling MOS transistors is proposed. The required load adaption realized by using two transformers along stage-bypassing technique impedance coarse tuning and switched capacitor fine tuning. Using 90-nm CMOS process, the proposed demonstrates PAE enhancement of 2.2×, 3.0×, 5.0× respectively at 6-dB, 9-dB, 15-dB transmit power back-off.
The sound of a vortex ring passing near semi-infinite porous edge is investigated analytically. A Green's function approach solves the associated problem and determines time-dependent pressure signal its directivity in acoustic far field as single dimensionless porosity parameter. At large values this parameter, radiated power scales on speed $U$ nearest distance between $L$ $U^6 L^{-5}$ , contrast to $U^5 L^{-4}$ scaling recovered impermeable limit. Results for configuration quiescent fluid...
Abstract. A new long-term emission inventory called the Inversed Emission Inventory for Chinese Air Quality (CAQIEI) was developed in this study by assimilating surface observations from China National Environmental Monitoring Centre (CNEMC) using ensemble Kalman filter (EnKF) and Nested Prediction Modeling System (NAQPMS). This contains constrained monthly emissions of NOx, SO2, CO, primary PM2.5, PM10, NMVOCs 2013 to 2020, with a horizontal resolution 15 km∗15 km. paper documents detailed...
Abstract. Air pollution in China has changed substantially since 2013, and the effects such changes bring to human health environment been an increasingly hot topic many scientific fields. Such studies, however, are often hindered by a lack of long-term air quality dataset high accuracy spatiotemporal resolutions. In this study, six-year long high-resolution Chinese reanalysis datasets (CAQRA) developed assimilating over 1000 surface monitoring sites from National Environmental Monitoring...
In recent years, with the rapid developments of wireless technologies, researches on Location-Based Services (LBSs) have attracted extensive attentions and one active topic among them is constraint-based route planning a Point-Of-Interest (POI) network. Although number studies this been proposed in literatures, most primarily consider geographic properties POIs route. fact, motivation user to visit POI frequently due that can provide some services meeting user's needs. Hence, requests should...
This paper discusses the new developed techniques through which supply voltage of CMOS RFICs can be effectively reduced. Various multi-gigahertz frequencies operating at a less than 1 V have been successfully demonstrated in this paper. Efforts made realization fully integrated RF front-end transceivers and frequency synthesizers standard process for system on chip applications.
This paper presents experimental CMOS RF frontends suitable for ultra-low-power and ultra-low-voltage operations. In order to achieve the desirable gain linearity of receiver chain at a reduced supply voltage, current-reused bias technique multiple-gated transistors are employed. As transmitter frontend, low-voltage double-balanced mixer is utilized maximize conversion gain. addition, differential-to-single-ended circuit also included increase saturated output power. Using standard 0.18-μm...
A simultaneous dual-band dual-waveform frequency synthesizer suitable for radar applications is presented. By using a K-band integer-N phase-locked loop (PLL) in conjunction with W-band modulation loop, sinusoidal carrier and frequency-modulated continuous-wave chirp can be generated concurrently. Due to the single PLL architecture signal generation, additional filter, phase detector, dividers are no longer required reduced chip area power consumption. Fabricated 90-nm CMOS process, proposed...
In this paper, a passive half-quadrature hybrid (HQH) is presented for multiphase signal generation at radio frequencies. Utilizing capacitance ratios as the primary design parameters, proposed exhibits excellent magnitude and phase balance even in presence of process temperature variations. Therefore, it well suited integrated-circuit designs with on-chip capacitive elements. Using standard 0.18-μm CMOS process, HQH circuit integrated 5.6-GHz quadrature voltage-controlled oscillator (QVCO)...
A low-power quadrature frequency tripler is designed by using the sub-harmonic mixer configuration. The circuit implemented in CMOS 0.180 um technology. consumes 11.5 mW, while output buffers 43.1 all with supply voltage of 1.8 V. fundamental Harmonic Rejection Ratio (HRR <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> ) achieves more than 35 dB, and conversion gain -4.2 dB at 4.5 GHz. entire chip area occupied 1.4 × 1.1 mm <sup...
Vortex structures in the atmosphere and wakes of aircraft generate fluid loads that may be beneficial (e.g., a reduction induced drag) or detrimental cause unsteady buffeting dynamic instability) depending on aerodynamic scenario at hand. Two distinct models are developed here to (i) investigate separately aeroelastic effects spanwise-oriented gusts encountering an airfoil (ii) predict self-rotation perturbed streamwise-oriented trailing vortex. In Part I, dynamically-coupled interactions...
This paper presents the development of a cold gas attitude control system. The system consists body frame with sensors, tank and solenoid valves thruster nozzles. on-off thrust actuators enable to rotate in yaw direction. objective this is bring desired (orientation) starting from its initial angular position. detailed dynamic model derived using Euler-Lagrange method facilitate controller design. Based on linearized model, bang-bang scheme used do control. designed law implemented digital...