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Differentiating ASK Demodulator for Contactless Smart Cards Supporting VHBR
Hyongmin Lee,Jisung Kim,Dongwoo Ha,Taehoon Kim,Suhwan Kim IEEE 2015 IEEE Transactions on Circuits and Systems II: Expr Vol. No.
<P>This brief proposes an amplitude shift keying (ASK) demodulator that uses switched-capacitor differentiators to make it compliant with the very high bit rate amendment to the ISO/IEC 14443 standard for contactless smart card applications. These differentiators detect transitions in modulated ASK signals with a carrier frequency of 13.56 MHz at data rates up to 6.78 Mb/s. The demodulator has been implemented in 0.18 μm CMOS technology. The total power consumption is under 350 μW. Measured results confirm correct operation, and it is further shown that this differentiating scheme allows the modulation index to be reduced to 2.56%.</P>
Optical Failure Analysis Technique in Deep Submicron CMOS Integrated Circuits
Sunkwon Kim,Hyongmin Lee,Hyunjoong Lee,Jong-Kwan Woo,Junho Cheon,Hwan-Yong Kim,Young June Park,Suhwan Kim 대한전자공학회 2011 Journal of semiconductor technology and science Vol.11 No.4
In this paper, we have proposed a new approach for optical failure analysis which employs a CMOS photon-emitting circuitry, consisting of a flipflop based on a sense amplifier and a photon-emitting device. This method can be used even with deepsubmicron processes where conventional optical failure analyses are difficult to use due to the low sensitivity in the near infrared (NIR) region of the spectrum. The effectiveness of our approach has been proved by the failure analysis of a prototype designed and fabricated in 0.18 μm CMOS process.
Design of a Two-Stage Driver for LED MR16 Retrofit Lamps Compatible with Electronic Transformers
Sungwon Yim,Hyongmin Lee,Bongjin Lee,Kyucheol Kang,Suhwan Kim 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.1
Drivers for LED MR16 retrofit lamps need to be compatible with the dimmers and electronic transformers which originally operated with the halogen lamps to be replaced. We present a two-stage MR16 LED driver consisting of a boost converter in the first stage and a buck converter in the second stage. Our design has been analyzed in the frequency domain using simulations to demonstrate that it effectively suppresses the high-frequency components of the AC output of the electronic transformer. Experiment results with a driver prototype verify the simulation results as well as dimmability.
MATLAB/Simulink Pulse-Echo Ultrasound System Simulator Based on Experimentally Validated Models
Taehoon Kim,Sangmin Shin,Hyongmin Lee,Hyunsook Lee,Heewon Kim,Eunhee Shin,Suhwan Kim IEEE 2016 and Frequency Control Vol.63 No.2
<P>A flexible clinical ultrasound system must operate with different transducers, which have characteristic impulse responses and widely varying impedances. The impulse response determines the shape of the high-voltage pulse that is transmitted and the specifications of the front-end electronics that receive the echo; the impedance determines the specification of the matching network through which the transducer is connected. System-level optimization of these subsystems requires accurate modeling of pulse-echo (two-way) response, which in turn demands a unified simulation of the ultrasonics and electronics. In this paper, this is realized by combining MATLAB/Simulink models of the high-voltage transmitter, the transmission interface, the acoustic subsystem which includes wave propagation and reflection, the receiving interface, and the front-end receiver. To demonstrate the effectiveness of our simulator, the models are experimentally validated by comparing the simulation results with the measured data from a commercial ultrasound system. This simulator could be used to quickly provide system-level feedback for an optimized tuning of electronic design parameters.</P>
차량용 반도체를 위한 12-비트 R-2R 사다리 저항 배열 D/A 변환기 분석 및 설계
신상민(Sangmin Shin),이형민(Hyongmin Lee),박유진(Yujin Park),김태훈(Taehoon Kim),김수환(Suhwan Kim) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
In this paper, we analyze the problems that occurred when designing R-2R ladder DAC(Digital-to-Analog Converter) such as resistor mismatch. To solve the problem, we use a wide-swing current-mode R-2R DAC instead of a conventional current-mode R-2R DAC and segmentation technique is implemented in the upper four bits. We have designed 12-bit R-2R ladder DAC for automotive applications and have confirmed the performance of the DAC with post layout simulation and ENOB (Effective number of bits) is 11.40 bits with operating frequency of 50kHz.
Design of a Two-Stage Driver for LED MR16 Retrofit Lamps Compatible with Electronic Transformers
Yim, Sungwon,Lee, Hyongmin,Lee, Bongjin,Kang, Kyucheol,Kim, Suhwan The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.1
Drivers for LED MR16 retrofit lamps need to be compatible with the dimmers and electronic transformers which originally operated with the halogen lamps to be replaced. We present a two-stage MR16 LED driver consisting of a boost converter in the first stage and a buck converter in the second stage. Our design has been analyzed in the frequency domain using simulations to demonstrate that it effectively suppresses the high-frequency components of the AC output of the electronic transformer. Experiment results with a driver prototype verify the simulation results as well as dimmability.
Woo-Yeol Shin,Gi-Moon Hong,Hyongmin Lee,Jae-Duk Han,Kyu-Sang Park,Dong-Hyuk Lim,Sunkwon Kim,Daeyong Shim,Jung-Hoon Chun,Deog-Kyoon Jeong,Suhwan Kim IEEE 2013 IEEE transactions on components, packaging, and ma Vol.3 No.5
<P>In this paper, we introduce an impedance-matched bidirectional multidrop (IMBM) DQ bus, together with a 4.8-Gb/s transceiver for a memory controller that supports this bus. Reflective ISI is eliminated at each stub of the IMBM DQ bus by resistive unidirectional impedance matching. A prototype memory controller transceiver is designed and fabricated in a 0.13-μm CMOS process and operates with a 1.2-V supply voltage. Its effectiveness is shown on various multidrop channel configurations. At 4.8 Gb/s, this transceiver with a 4-slot, 8-drop IMBM DQ bus has an eye opening of 0.39 UI in TX mode and 0.58 UI in RX mode, at a threshold of 10<SUP>-9</SUP> BER, whereas a comparable transceiver with a conventional 4-slot, 8-drop stub series terminated logic has no timing margin under the same test conditions. Our transceiver consumes 14.25 mW/Gb/s per DQ in TX mode, and 13.69 mW/Gb/s per DQ in RX mode.</P>
Sunkwon Kim,Jong-Kwan Woo,Woo-Yeol Shin,Gi-Moon Hong,Hyongmin Lee,Hyunjoong Lee,Suhwan Kim IEEE 2013 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.60 No.1
<P>We propose a low-voltage low-power clock and data recovery (CDR) circuit which incorporates a relaxation-based voltage-controlled oscillator and clock-edge modulation, which eliminates the need for an external reference clock without allowing harmonic locking. This CDR supports input data rates between 200 kbps and 10 Mbps at 0.7 V and operates up to 24 MHz at 1.0 V. The proposed design consumes 8 at an input data rate of 10 Mbps and achieves 0.8 pJ/bit of energy per bit even though the circuit is implemented in a 0.18- μm CMOS technology.</P>
Kang Koung Mi,Kim Kyung Min,Kim In Seong,Kim Joo Hyun,Kang Ho,Ji So Young,Dho Yun-Sik,Oh Hyongmin,Park Hee-Pyoung,Seo Han Gil,Kim Sung-Min,Choi Seung Hong,Park Chul-Kee 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.6
Objective: Functional magnetic resonance imaging (fMRI) and diffusion tensor imaging-derived tractography (DTI-t) contribute to the localization of language areas, but their accuracy remains controversial. This study aimed to investigate the diagnostic performance of preoperative fMRI and DTI-t obtained with a simultaneous multi-slice technique using intraoperative direct cortical stimulation (DCS) or corticocortical evoked potential (CCEP) as reference standards. Materials and Methods: This prospective study included 26 patients (23–74 years; male:female, 13:13) with tumors in the vicinity of Broca’s area who underwent preoperative fMRI and DTI-t. A site-by-site comparison between preoperative (fMRI and DTI-t) and intraoperative language mapping (DCS or CCEP) was performed for 226 cortical sites to calculate the sensitivity and specificity of fMRI and DTI-t for mapping Broca’s areas. For sites with positive signals on fMRI or DTI-t, the true-positive rate (TPR) was calculated based on the concordance and discordance between fMRI and DTI-t. Results: Among 226 cortical sites, DCS was performed in 100 sites and CCEP was performed in 166 sites. The specificities of fMRI and DTI-t ranged from 72.4% (63/87) to 96.8% (122/126), respectively. The sensitivities of fMRI (except for verb generation) and DTI-t were 69.2% (9/13) to 92.3% (12/13) with DCS as the reference standard, and 40.0% (16/40) or lower with CCEP as the reference standard. For sites with preoperative fMRI or DTI-t positivity (n = 82), the TPR was high when fMRI and DTI-t were concordant (81.2% and 100% using DCS and CCEP, respectively, as the reference standards) and low when fMRI and DTI-t were discordant (≤ 24.2%). Conclusion: fMRI and DTI-t are sensitive and specific for mapping Broca’s area compared with DCS and specific but insensitive compared with CCEP. A site with a positive signal on both fMRI and DTI-t represents a high probability of being an essential language area.
Seungeun Choi,Young Hoon Choi,Hoo Seung Lee,Kyong Won Shin,Yoon Jung Kim,Hee-Pyoung Park,Won-Sang Cho,Hyongmin Oh 대한신경외과학회 2023 Journal of Korean neurosurgical society Vol.66 No.6
Objective : This study compared the quality of recovery (QoR) after minicraniotomy for clipping of unruptured intracranial aneurysms (UIAs) between patients with and without scalp nerve block (SNB). Methods : Patients were randomly assigned to the SNB (SNB using ropivacaine with epinephrine, n=27) and control (SNB using normal saline, n=25) groups. SNB was performed at the end of surgery. To assess postoperative QoR, the QoR-40, a patient-reported questionnaire, was used. The QoR-40 scores were measured preoperatively, 1–3 days postoperatively, at hospital discharge, and 1 month postoperatively. Pain and intravenous patient-controlled analgesia (IV-PCA) consumption were evaluated 3, 6, 9, and 12 hours and 1–3 days postoperatively. Results : All QoR-40 scores, including those measured 1 day postoperatively (primary outcome measure; 155.0 [141.0–176.0] vs. 161.0 [140.5–179.5], p=0.464), did not significantly differ between the SNB and control groups. The SNB group had significantly less severe pain 3 (numeric rating scale [NRS]; 3.0 [2.0–4.0] vs. 5.0 [3.5–5.5], p=0.029), 9 (NRS; 3.0 [2.0–4.0] vs. 4.0 [3.0–5.0], p=0.048), and 12 (NRS; 3.0 [2.0–4.0] vs. 4.0 [3.0–5.0], p=0.035) hours postoperatively. The total amount of IV-PCA consumed was significantly less 3 hours postoperatively in the SNB group (2.0 [1.0–4.0] vs. 4.0 [2.0–5.0] mL, p=0.044). Conclusion : After minicraniotomy for clipping of UIAs, SNB reduced pain and IV-PCA consumption in the early postoperative period but did not improve the QoR-40 scores.