A5019237957- Energy Harvesting in Wireless Networks
- Wireless Power Transfer Systems
- Advanced DC-DC Converters
- Analog and Mixed-Signal Circuit Design
- Innovative Energy Harvesting Technologies
- Advanced Battery Technologies Research
- Advancements in Semiconductor Devices and Circuit Design
- Neuroscience and Neural Engineering
- Radio Frequency Integrated Circuit Design
- Silicon Carbide Semiconductor Technologies
- Underwater Vehicles and Communication Systems
- Advanced Power Amplifier Design
- Semiconductor materials and devices
- Magnetic Field Sensors Techniques
- Welding Techniques and Residual Stresses
- Advanced Memory and Neural Computing
- PAPR reduction in OFDM
- Electromagnetic Compatibility and Noise Suppression
- Non-Destructive Testing Techniques
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Inertial Sensor and Navigation
- Magnetic Properties and Applications
- Indoor and Outdoor Localization Technologies
- CCD and CMOS Imaging Sensors
Electronics and Telecommunications Research Institute
2023-2024
Samsung (South Korea)
2021-2023
Korea Advanced Institute of Science and Technology
2015-2021
This paper presents a double pile-up resonance energy harvesting circuit that efficiently and simultaneously extracts from piezoelectric transducer (PZT) thermoelectric generator. The proposed harvester operates in mode (DPM) to extract PZT with the enhanced damping force, resulting 1452% improvement power extraction, which is best performance among state-of-the-art works. also boost converter (BCM) without an additional switch, achieving 75% conversion efficiency at 450-μW output power....
This letter proposes an ultralow power single-inductor multiple-output converter for implantable stimulation system. minimizes the number of switches turning <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</small> and xmlns:xlink="http://www.w3.org/1999/xlink">off</small> to deliver outputs 0.8, 1.8, 20 V, it uses a soft-switching technique all switching nodes. It also operates with self-oscillating controller only when require power. As...
This letter presents a 2-phase 3-level (2P3L) envelope tracking supply modulator (ETSM) for long-term evolution 20 MHz (LTE20) radio frequency power amplifier as solution the ET system. 2P3L ETSM that is composed of only switching converters achieves high efficiency, fast transient response, and small output current ripple. To properly operate proposed ETSM, 4 pulse width modulatiop (PWM) signals with 90° phase shift from each PWM signal are required without any mismatch between duty cycles....
In this paper, a resonant current-mode receiver is studied to charge low-voltage batteries wirelessly for supplying medical implantable systems. To increase efficiency, the root-mean-square (rms) current in LC tank of (RX) reduced by using voltage-boosted (VBCM) receiver. This combines conventional with switched-capacitor converter boost voltage instantaneously at switching node (V <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">X</sub> ) coil....
In this paper, a fully integrated digitally assisted low-dropout regulator (LDO) for NAND flash memory system is proposed and verified using 500 nm I/O CMOS transistors. By combining an amplifier (AMP)-based LDO with comparator (CMP)-based LDO, the achieves both fast load response in transient state accurate regulation steady state, which are advantages of CMP-based AMP-based respectively. Moreover, loop frequency stability satisfied wide range currents between 0 150 mA by simple structure g...
This letter presents a wireless power transfer (WPT) system for wristband device charging. By using dual receiver coils with switches in an interleaved manner, the proposed WPT can simultaneously operate to accumulate energy from primary coil and previously accumulated battery each coil. As result, efficiency be increased small coils, even at high load resistance. The is theoretically analyzed by lumped circuit model verified measurement prototype boards. Compared conventional structure that...
As more features have been added to mobile devices, it has become necessary integrate DC-DC converters into the power-management IC. Consequently, there is a growing need for an area-efficient and simple controller design converters. A hysteretic control without any additional component compensation very attractive solution because not only cost-effective, but also immediately responds load change. However, conventional current-mode with low-ESR output capacitor, shown in Fig. 12.1.1,...
In this paper, we present a column driver with load-aware pre-emphasis driving (LPD) as in Fig. 11.7.2. The LPD scheme calibrates the K value to panel-load resistance and capacitance minimize increase settling time due column-to-column panel-to-panel R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">L</sub> C delay variation. addition, self K-calibration reduces fabrication cost because no trimming of is required during fabrication. Before...
A micro-bolometer focal plane array (MBFPA) detector is one of the best candidates for thermal imaging cameras due to its excellent uncooled performance with low manufacturing cost [1-4]. In Fig. 10.8.1, remote infra-red signals from objects are maximized and absorbed at MEMS pixels having a λ/4 cavity structure, they then converted into resistance thermistor layer in each cell. Then, CMOS analog front-end (AFE) reads out cell value current-mode by applying voltage bias pixel. readout...
This letter presents a single-inductor multiple-output (SIMO) step-up/down DC-DC converter for an implantable electro-ceutical system-on-chip (SoC), which generates the supply voltages of 0.8 V, 1.8 and 12 V from battery (3 -4.2 V). To extend life-time during long standby period, load-adaptive frequency-scaling (LAFS) without active load sensor is proposed, effectively reducing quiescent current under light loads at no expense tran-sient response performance. Also, this paper introduces new...
This paper presents a dual-source energy harvesting circuit that efficiently and simultaneously extracts the from piezoelectric transducer (PZT) thermoelectric generator (TEG). The harvester operates in pile-up mode (DPM) to extract both sources with an increment of damping force, resulting 1452% improvement power extraction even without TEG, which is best among the-state-of-the-art works. Also, boost converter (BCM) additional switch, achieving 75 % conversion efficiency at 450 μW output...
This paper presents a comparator-based Quasi-Digital LDO (QDLDO) for the negative supply which has an ultra-fast transient response PCRAM systems. Even under sharp spike of load current having peak value 80 mA with short rising time 2.5 ns, QDLDO effectively minimized voltage on output voltage, reducing it to 150 mV within only 40 ns. With I/O transistors withstand stress, this achieved bestFOM 0.042 V/um <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This paper presents new potentials and promising solutions for mid-to-long-range magnetic communication by overcoming the short distance limitations using a differential induction (DMI) sensorbased receiver. In addition, testing evaluation of links were conducted in practical channel environments, including air/water cross-boundary conventional/non-conventional media. A system DMI sensor-based receiver, triangularly arranged transmission coil antennas, was proposed. To evaluate proposed...
This paper presents the topology of a novel approach to magnetic communication using coil antenna-based transmitted system and differential induction (MI)-based receiver with MI sensor in underground mines. The test results limestone mine are presented. confirm that wireless digital quadrature phase shift keying (QPSK) is possible between Tx Rx at distance about 40 m. confirmed proposed can be utilized mining environments.
As the portable device market tries to enhance user experience, high-power audio systems with boosted supply voltage have been main design focus recently. Several past works addressed issues related voltages [1,2]. Nevertheless, power stage retained classical H-bridge structure in previous works, which resulted aggravated electromagnetic interference (EMI) from high switching amplitude and poor efficiency due boosting. The use of multi-level pulse-width modulation (PWM) shown Fig. 5.2.1 can...
This paper presents a wireless power transfer (WPT) system for an automated guided vehicle (AGV). Our WPT proposes AC-AC converter located in transmitter, which integrates AC-DC and DC-AC converters conventional structure. As result, the efficiency can be increased as well size. Additionally, proposed structure allows capacity to raised up 3.3 kW. The is theoretically analyzed using lumped circuit model verified with waveforms.
Telecommunication in harsh environments, such as an electrically conductive medium, requires the use of carrier bands with very-low and ultralow frequencies for radiofrequency links. Recent advancements atomic magnetometers operating at have facilitated reception digitally modulated signals. We demonstrate ability to transmit receive quadrature phase-shift keying (QPSK) signals using a multi-resonant loop antenna magnetometer. The introduced noticeably enhances bandwidth, expansion exceeding...
Depending on a type of input sources, mobile battery charger IC operates as buck converter to charge the from travel adapter (TA), and boost supply load current USB On-The-Go (OTG) battery, respectively. For both operations, zero switching (ZCS) is important achieve high conversion efficiency. However, because operating voltage change continuously status, optimal ZCS condition not constant. Although several techniques in [1–3] have been reported automatically calibrate operation, additional...