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Yu Li

Biography

Enrollment Date: 2011

Graduation Date：2014

Degree：M.S.

Defense Date：2014.05.26

Advisors：Woogeun Rhee

Department：Institute of Microelectronics，Tsinghua University

Title of Dissertation/Thesis：A Chirp-UWB Transceiver with Embedded Bulk PPM for Energy Efficient Data Transmission

Abstract:
With the development of computer peripherals, home consumer electronics and health care, relevant equipment become more and more complex. As a result, cables needed for communication between devices eventually become a burden. In this context, the urgent needs of wireless communication between devices within a short distance promote the rapid development of short-range wireless communications. Traditional narrowband systems have difficulty in meeting low power consumption and high data rate requirement of short-range wireless communications due to continuous modulation and bandwidth limitations. The ultra-wideband (UWB) system, on the other hand, with its wide bandwidth and low emission power, can achieve high data rate, while consuming very low power. Besides, its coexistance with existing narrowband systems has attracted widespread attention in academic and industry fields and become one of research focuses in the area of short range wireless communications. Existing UWB transceiver implementations including the impulse radio UWB (IR-UWB) and the frequency-modulated UWB (FM-UWB) have some disadvantages. That is, it is difficult to achieve a compromise among data rate, spectral efficiency and power consumption. Recently, the use of the chirp modulation scheme in UWB system has attracted extensive attention. The chirp UWB (Chirp-UWB) effectively combines the advantages of the IR-UWB and the FM-UWB, while overcoming their shortcomings. The good balance of the Chirp-UWB among the issues of data rate, power consumption, spectral efficiency and circuit complexity makes it a very promising technology. A low power UWB transmitter utilizing the chirp modulation scheme is proposed. The transmitter is composed of a digital gradient generator, a digital control radio frequency oscillator and a power amplifier. The transmitter operates with 10% duty cycle to save power. Binary data is modulated in chirp pulses with the same initial frequency but with the opposite frequency transformation direction. The transmitter was fabricated in 65 nm technology and the testing work has been finished. According to the testing results, the transmitter consumes 0.3 mW at 1 Mbps data rate. To improve data efficiency, a pulse-position modulation (PPM) embedded chirp-UWB transceiver is proposed on the basis of the chirp modulation. According to the proposed modulating scheme, data are carried in the form of symbols. The 1.6 Mb/s transceiver was fabricated in 0.18 mm CMOS. The spectral efficiency of the PPM embedded chirp modulation is shown to be better than that of the conventional chirp modulation by nearly 30%.

Publications

Papers：：

[1] Yunlan Xu, Xiangyu Li, Gesture detection scheme and hardware design for dual detection of moving and static targets, Vol.63, No.8, pp.1192-1198, 2023.

[2] Yifu Zhao, Shujuan Yin, Wei Tao, Xiangyu Li, Jie Meng, Gesture Recognition System Resilient to Interdevice Interference Based on Direct Sequence Spread Spectrum, IEEE Sensors Letters, Vol.7, No.5, pp.2475-1472, 2023.

[3] Pixi Kang, Xiangyu Li, STAR: An STGCN ARchitecture for Skeleton-Based Human Action Recognition, IEEE Transactions on Circuits and Systems I: Regular Papers, Vol.70, No.6, pp.2370-2383, 2023.

[4] Yanshu Guo, Qichun Liu, Yaoyu Li, Wenqiang Huang, Tian Tian, Siqi Zhang, Nan Wu, Songyao Tan, Ning Deng, Zhihua Wang, Hanjun Jiang, Tiefu Li, Yuanjin Zheng, A Polar-Modulation-Based Cryogenic Transmon Qubit State Controller in 28 nm Bulk CMOS for Superconducting Quantum Computing, IEEE Journal of Solid-State Circuits, Vol.58, No.11, pp.3060-3073, 2023.

[5] Xu Cheng, Xiangyu Li, High Frequency Audio Devices Based Inaudible Ultrasonic Hand Tracking System Using Subspace Method, 2023 IEEE SENSORS, pp.1-4, 2023.

[6] Pixi Kang, Lingfeng Gao, Xiangyu Li, Bayesian Filter-Based Ultrasonic Continuous Hand Gesture Recognition for Low-Resource Platform, 2023 IEEE SENSORS, pp.1-4, 2023.

[7] Yanshu Guo, Yaoyu Li, Wenqiang Huang, Songyao Tan, Qichun Liu, Tiefu Li, Ning Deng, Zhihua Wang, Yuanjin Zheng, Hanjun Jiang, A Polar-Modulation-Based Cryogenic Qubit State Controller in 28nm Bulk CMOS, ISSCC 2023, pp.508-510, 2023.

[8] Yaoyu Li, Yanshu Guo, Wen Jia, Fule Li, Zhihua Wang, Hanjun Jiang, Current-Steering DAC Calibration Using Q-Learning, ISCAS 2023, pp.1-5, 2023.

[9] Ning Pu, Kaiji Liu, Heyue Li, Nan Wu, Yaoyu Li, Wen Jia, Zhihua Wang, Hanjun Jiang, Resource-efficient Face Detector Using 1.5-bit Frame-to-frame Delta Quantization for Image Based Always-on Wake-up Application, ISCAS 2023, pp.1-5, 2023.

[10] Wenqiang Huang, Yanshu Guo, Yaoyu Li, Zhihua Wang, Yuanjin Zheng, Tiefu Li, Wen Jia, Hanjun Jiang, A 400uW 3.6GHz-4.6GHz Low Power Cryogenic CP-PLL with Transformer-Based VCO in 28nm Bulk CMOS, ICTA 2023, pp.126-127, 2023.

[11] Zhiqiang Luo, Hongyu Li, Junjie Jing, Yan Chen, Yutong Zhang, Fule Li, A Dual Mode SAR ADC with Oversampling and Dithering for Extended Accuracy, pp.1-4, 2022.

[12] Jie Meng, Xiangyu Li, Shujuan Yin, Modeling and Signal Processing for Direct Sequence Spread Spectrum Intelligent Radars, Telecommunication Engineerin, Vol.62, No.11, pp.1614-1621, 2022.

[13] Yanshu Guo, Yaoyu Li, Zhaoyang Weng, Hanjun Jiang, Zhihua Wang, A 0.66mW 400 MHz/900 MHz Transmitter IC for In-Body Bio-Sensing Applications, IEEE Transactions on Biomedical Circuits and Systems, Vol.16, No.2, pp.252-265, 2022.

[14] Pixi Kang, Xiangyu Li, Lightweight Online Semisupervised Learning for Ultrasonic Radar-Based Dynamic Hand Gesture Recognition, IEEE Sensors Journal, Vol.23, No.3, pp.2707-2717, 2022.

[15] Xiangyu Li, Gongning Luo, Wei Wang, Kuanquan Wang, Yue Gao, Shuo Li, Hematoma Expansion Context Guided Intracranial Hemorrhage Segmentation and Uncertainty Estimation, IEEE Journal of Biomedical and Health Informatics, Vol.26, No.3, pp.1140-1151, 2022.

[16] Yuankun Wei, Ziyu Fu, Debing Zhang, Guangqi Wang, Chun Zhang, Xiang Xie, Xiangyu Li, A Registration Method for Total Knee Arthroplasty Surgical Robot, ITOEC 2022, pp.535-538, 2022.

[17] Zeliang Zhao, Xin Wu, Dengjie Wang, Ziqiang Wang, Chun Zhang, Xiangyu Li, Zhihua Wang, A 40 Gbps PAM-4 Receiver with 12-Tap Direct Decision Feedback Equalizer Employing 1.5-stage Slicers in 65-nm CMOS, ICTA 2022, pp.230-231, 2022.

[18] Yanshu Guo,Yaoyu Li,Hanjun Jiang,Xiaofeng Yang,Zhihua Wang, A 110pJ/Bit Star- 16QAM 915MHz Band Ultra-Low Power Receiver Based on Polar Architecture, ISCAS 2021, pp.1-4, 2021.

[19] Feifei Zhou,Xiangyu Li,Zhihua Wang, Efficient High Cross-User Recognition Rate Ultrasonic Hand Gesture Recognition System, IEEE Sensors Journal, Vol.20, No.22, pp. 13501 - 13510, 2020.

[20] Xuqiang Zheng,Fangxu Lv,Lei Zhou,Danyu Wu,Jin Wu,Chun Zhang,Woogeun Rhee,Xinyu Liu, Frequency-Domain Modeling and Analysis of Injection-Locked Oscillators, IEEE Journal of Solid-State Circuits, Vol.55, No.6, pp. 1651 - 1664, 2020.

[21] Xiangyu Li,Nijie Xie, Multi-algorithm Fusion Framework for Energy Prediction of Energy Harvesting IoT Node and Implementation, Chinese Journal of Electronics, Vol.29, No.5, pp. 952 - 958, 2020.

[22] Yanshu Guo,Yaoyu Li,Linpei Zhang,Hanjun Jiang,Zhihua Wang,Wen Jia, A 41μA Direct Frequency Modulation IC for Indoor Voice Broadcast in LF Band with Background Frequency Calibration, ICTA 2020, pp.53-54, 2020.

[23] Yining Zhang,Haixin Song,Ranran Zhou,Woogeun Rhee,Zhihua Wang, A Capacitor-less Ripple-less Hybrid LDO With Exponential Ratio Array and 4000x Load Current Range, IEEE Transactions on Circuits and Systems II: Express Briefs, Vol.66, No.1, pp. 36 - 40, 2019.

[24] Feifei Zhou,Xiangyu Li,Zhihua Wang, Efficiently User-Independent Ultrasonic-Based Gesture Recognition Algorithm, IEEE SENSORS 2019, pp. 1 - 4, 2019.

[25] Zhonghan Zhang,Yancao Jiang,Chenyu Zhang,Chun Zhang,Xiangyu Li, The Optimization of Localization and Navigation for Vision-based Robot, ICTA 2019, pp. 180 - 181, 2019.

[26] Yu Zhao,Xiangyu Li,Shujuan Yin, Reconfigurable Parser for Software Defined Network L4 Ethernet Switch Chip, ICTA 2019, pp. 81 - 82, 2019.

[27] Mengyao Zhang,Xiangyu Li, An Efficient Real-Time Two-Dimensional CA-CFAR Hardware Engine, EDSSC 2019, pp. 1 - 3, 2019.

[28] Wenhuan Luan,Xiangyu Li,Dengjie Wang,Ziqiang Wang,Xin Lin,Mao Li, A 1.25-8.5 Gb/s wide range CDR with locking detector in 40 nm CMOS technology, EDSSC 2019, pp. 1 - 3, 2019.

[29] Xiaohua Huang,Dang Liu,Woogeun Rhee,Zhihua Wang, A 1-GHz 1.6-mW Auto-Calibrated Bit Slicer for Energy/Envelope Detection Receivers, IEEE Transactions on Circuits and Systems II: Express Briefs, Vol.65, No.5, pp. 587 - 591, 2018.

[30] Xiaohua Huang,Han Liu,Woogeun Rhee,Zhihua Wang, A DS DPLL with 1b TDC, 4b DTC and 8-Tap FIR Filter For Low-Voltage Clock Generation/Modulation Systems, VLSI-DAT 2018, pp. 1 - 2, 2018.

[31] Hongyu Li,Fule Li,Weitao Li,Hanjun Jiang,Zhihua Wang, Design of a 5GS/s 200 MHz BW 74.8 dB SNDR continuous-time sigma delta modulator in 28nm CMOS, ISNE 2018, pp. 1 - 4, 2018.

[32] Xiangyu Li,Nijie Xie, Multi-Model Fusion Harvested Energy Prediction Method for Energy Harvesting WSN Node, EDSSC 2018, pp. 1 - 2, 2018.

[33] Xinhan Lin,Shouyi Yin,Fengbin Tu,Leibo Liu,Xiangyu Li,Shaojun Wei, LCP: a Layer Clusters Paralleling mapping method for accelerating Inception and Residual networks on FPGA, DAC 2018, pp. 1 - 6, 2018.

[34] Dang Liu,Xiaohua Huang,Zhendong Ding,Haixin Song,Woogeun Rhee,Zhihua Wang, A 26.6mW 1Gb/s dual-antenna wideband receiver with auto beam steering for secure proximity communications, CICC 2018, 2018.

[35] Yining Zhang,Ranran Zhou,Woogeun Rhee,Zhihua Wang, A 1.9-mW 750-kb/s 2.4-GHz F-OOK Transmitter With Symmetric FM Template and High-Point Modulation PLL, Journal of Solid-State Circuits, Vol.52, No.10, pp.2627 - 2635, 2017.

[36] Han Liu,Sitao Lv,Xiaohua Huang,Woogeun Rhee,Zhihua Wang, A fractional-NBB-DPLL with auto-tuned DTC and FIR filter for noise and spur reduction, RFIT 2017, pp. 238 - 240, 2017.

[37] Ranran Zhou,Yining Zhang,Woogeun Rhee,Zhihua Wang, An Energy/Bandwidth/Area Efficient Frequency-Domain OOK Transmitter with Phase Rotated Modulation, ISCAS 2017, pp. 1 - 4, 2017.

[38] Shun Lei,Xiangyu Li,Yafei Liu, Soft-Edge error-detecting flip-flop for lowering error-correction-rate under ultra-low voltage, EDSSC 2017, pp. 1 - 2, 2017.

[39] Yining Zhang,Ranran Zhou,Woogeun Rhee,Zhihua Wang, A 6.1mW 5Mb/s 2.4GHz transceiver with F-OOK modulation for high bandwidth and energy efficiencies, CICC 2017, pp. 1 - 4, 2017.

[40] Weitao Li,Fule Li,Jia Liu,Hongyu Li,Zhihua Wang, A 13-bit 160MS/s pipelined subranging-SAR ADC with low-offset dynamic comparator, A-SSCC 2017, pp. 225 - 228, 2017.

[41] Yanting Ren,Liji Wu,Hexin Li,Xiangyu Li,Xiangmin Zhang,An Wang,Hongyi Chen, Key recovery against 3DES in CPU smart card based on improved correlation power analysis, Tsinghua Science and Technology, Vol.21, No.2, pp. 210 - 220, 2016.

[42] Xiaofeng Liu,Dang Liu,Woogeun Rhee,Zhihua Wang, A Multiphase Clock Generation for UWB Transceiver, Microelectronics & Computer, Vol.33, No.11, pp. 87-90+94, 2016.

[43] Yonghong Bai,Liji Wu,Xingjun Wu,Xiangyu Li,Xiangmin Zhang,Beibei Wang, PUF based encryption method for IC cards on-chip memories, Electronics Letters, Vol.52, No.20, pp. 1671 - 1673, 2016.

[44] Sitao Lv,Ni Xu,Woogeun Rhee,Zhihua Wang, A Hybrid Frequency/Phase-Locked Loop for Versatile Clock Generation with Wide Reference Frequency Range, VLSI-DAT 2016, pp. 1 - 4, 2016.

[45] Yining Zhang,Xuwen Ni,Woogeun Rhee,Zhihua Wang, A 1.8mW 2Mb/s Chirp-UWB Transceiver with Burst-Mode Transmission and Slope-Based Detection, RFIT 2016, pp. 1 - 3, 2016.

[46] Xuwen Ni,Woogeun Rhee,Zhihua Wang, A 0.3mW 1Mb/s High Security Proximity UWB Transmitter with Frequency/Time-Domain Scrambling, RFIT 2016, pp. 1 - 3, 2016.

[47] Xuwen Ni,Yining Zhang,Woogeun Rhee,Wen Jia,Zhihua Wang, A 0.5mW 1Mb/s Multi-Channel Chirp-UWB Transmitter with Burst-Mode Transmission and Optimized Digital Gradient, IWS 2016, pp. 1 - 4, 2016.

[48] Han Liu,Woogeun Rhee,Zhihua Wang, A 10.3mW 13.6GHz Phase-Locked Loop with Boosted Gm Two-Stage Ring VCO, ICSICT 2016, 2016.

[49] Ranran Zhou,Yining Zhang,Woogeun Rhee,Zhihua Wang, 2.4GHz 20Mb/s FSK Receiver Front-End and Transmitter Modulation PLL Design for Energy-Efficient Short-Range Communication, EDSSC 2016, 2016.

[50] Yining Zhang,Ranran Zhou,Woogeun Rhee,Zhihua Wang, A 1.9mW 750kb/s 2.4GHz F-OOK transmitter with symmetric FM template and high-point modulation PLL, A-SSCC 2016, pp. 277 - 280, 2016.

[51] Heng Liu,Hanjun Jiang,Yiyu Shen,Woogeun Rhee,Zhihua Wang, A Delta-Sigma-Based Transmitter Utilizing FIR Embedded Digital Power Amplifiers, MWSCAS 2015, 2015.

[52] Xiaoyong Li,Sitao Lv,Xiaofeng Liu,Ni Xu,Woogeun Rhee,Wen Jia,Zhihua Wang, A 10 Mb/s Hybrid Two-Point Modulator with Front-End Phase Selection and Dual-Path DCO Modulation, IWS 2015, pp. 1 - 4, 2015.

[53] Chao Yang,Shaoquan Gao,Jingjing Dong,Hanjun Jiang,Woogeun Rhee,Zhihua Wang, A 2.4 GHz two-point Δ-Σ modulator with gain calibration and AFC for WPAN/BAN applications, ASICON 2015, pp. 1 - 4, 2015.

[54] Yutao Liu,Woogeun Rhee,Zhihua Wang, Microelectronics, Vol.44, No.3, pp.1, 2014.

[55] Shuai Yuan,Ziqiang Wang,Xuqiang Zheng,Ke Huang,Ni Xu,Woogeun Rhee,Liji Wu,Chun Zhang, A 4.8-mW/Gb/s 9.6-Gb/s 5+1-Lane Source-Synchronous Transmitter in 65-nm Bulk CMOS, IEEE Transactions on Circuits and Systems II: Express Briefs, Vol.61, No.4, pp. 209 - 213, 2014.

[56] Ni Xu,Woogeun Rhee,Zhihua Wang, A Hybrid Loop Two-Point Modulator Without DCO Nonlinearity Calibration by Utilizing 1 Bit High-Pass Modulation, IEEE Journal of Solid-State Circuits, Vol.49, No.10, pp. 2172 - 2186, 2014.

[57] Huiying Zhuo,Yu Li,Woogeun Rhee,Zhihua Wang, A 1.5GHz all-digital frequency-locked loop with 1-bit ΔΣ frequency detection in 0.18μm CMOS, VLSI-DAT 2014, pp. 1 - 4, 2014.

[58] Yu Li,Fei Chen,Dang Liu,Xiaoyong Li,Yang Li,Yudong Zhang,Zhicheng Wang,Woogeun Rhee,Zhihua Wang, A 1.6Mb/s 3.75–4.25GHz chirp-UWB transceiver with enhanced spectral efficiency in 0.18μm CMOS, RFIT 2014, pp. 1 – 3, 2014.

[59] Fei Chen,Yu Li,Dang Liu,Woogeun Rhee,Jongjin Kim,Dongwook Kim,Zhihua Wang, A 1mW 1Mb/s 7.75-to-8.25GHz chirp-UWB transceiver with low peak-power transmission and fast synchronization capability, ISSCC 2014, pp. 162 - 163, 2014.

[60] Shuli Geng,Dang Liu,Yanfeng Li,Huiying Zhuo,Woogeun Rhee,Zhihua Wang, A 13.3mW 500Mb/s IR-UWB Transceiver with Link-Margin Enhancement Technique for Meter-Range Communications, ISSCC 2014, pp. 160 - 161, 2014.

[61] Yanfeng Li,Ni Xu,Woogeun Rhee,Zhihua Wang, A 2.5GHz ADPLL with PVT-insensitive ΔΣ dithered time-to-digital conversion by utilizing an ADDLL, ISCAS 2014, pp. 1440 - 1443, 2014.

[62] Dang Liu,Shuli Geng,Woogeun Rhee,Zhihua Wang, A high efficiency robust IR-UWB receiver design for high data rate CM-range communications, ISCAS 2014, pp. 1901 - 1904, 2014.

[63] Yiyu Shen,Xican Chen,Woogeun Rhee,Zhihua Wang, A second-order multi-bit ΔΣ TDC for high resolution IR-UWB radar systems, IEEE-IWS 2014, pp. 1 - 4, 2014.

[64] Yu Li,Fei Chen,Woogeun Rhee,Zhihua Wang, A chirp-UWB transceiver with embedded bulk PPM for energy efficient data transmission, IEEE-IWS 2014, pp. 1 - 4, 2014.

[65] Zhicheng Wang,Xican Chen,Yiyu Shen,Woogeun Rhee,Zhihua Wang, A 3.1–4.8-GHz delay-line-based frequency-hopping IR-UWB transmitter in 65-NM CMOS technology, ICSICT 2014, pp. 1 - 3, 2014.

[66] Yang Li,Ni Xu,Yining Zhang,Wooguen Rhee,Sanghoon Kang,Zhihua Wang, A 0.65V 1.2mW 2.4GHz/400MHz dual-mode phase modulator for mobile healthcare applications, A-SSCC 2014, pp. 261 - 264 , 2014.

[67] Woogeun Rhee,Ni Xu,Bo Zhou,Zhihua Wang, Fractional-N Frequency Synthesis: Overview and Practical Aspects with FIR-Embedded Design, Journal of Semiconductor Technology and Science, Vol.13, No.2, pp. 170 - 183, 2013.

[68] Fei Chen,Wei Zhang,Woogeun Rhee,Jongjin Kim,Dongwook Kim,Zhihua Wang, A 3.8-mW 3.5–4-GHz Regenerative FM-UWB Receiver With Enhanced Linearity by Utilizing a Wideband LNA and Dual Bandpass Filters, IEEE Transactions on Microwave Theory and Techniques, Vol.61, No.9, pp. 3350 - 3359, 2013.

[69] Hang Lv,Bo Zhou,Dang Liu,Woogeun Rhee,Yongming Li,Zhihua Wang, A 5.2–11.8MHz octa-phase relaxation oscillator for 8-PSK FM-UWB transceiver systems, VLSI-DAT 2013, pp. 1 - 4, 2013.

[70] Dang Liu,Fei Chen,Woogeun Rhee,Zhihua Wang, An FM-UWB transceiver with M-PSK subcarrier modulation and regenerative FM demodulation, MWSCAS 2013, pp. 936 – 939, 2013.

[71] Shuli Geng,Ni Xu,Jun Li,Xueyi Yu,Woogeun Rhee,Zhihua Wang, A PLL/DLL Based CDR with Delta-Sigma Frequency Tracking and Low Algorithmic Jitter Generation, ISCAS 2013, pp. 1179 - 1182, 2013.

[72] Fei Chen,Yu Li,Deyuan Lin,Huiying Zhuo,Woogeun Rhee,Jongjin Kim,Dongwook Kim,Zhihua Wang, A 1.14mW 750kb/s FM-UWB transmitter with 8-FSK subcarrier modulation, CICC 2013, pp. 1 - 4, 2013.

[73] Nan Qi,Yang Xu,Baoyong Chi,Yang Xu,Xiaobao Yu,Xing Zhang,Ni Xu,Patrick Chiang,Woogeun Rhee, Zhihua Wang, A Dual-Channel Compass/GPS/GLONASS/Galileo Reconfigurable GNSS Receiver in 65 nm CMOS With On-Chip I/Q Calibration, IEEE Transactions on Circuits and Systems -I: Regular papers, Vol.59, No.8, pp. 1720 - 1732, 2012.

[74] Fei Chen,Wei Zhang,Woogeun Rhee,Jongjin Kim,Dongwook Kim,Zhihua Wang, A 3.8mW, 3.5–4GHz regenerative FM-UWB receiver with enhanced linearity by utilizing a wideband LNA and dual bandpass filters, RFIT 2012, pp. 150 - 152, 2012.

[75] Yizhi Han,Woogeun Rhee,Zhihua Wang, A PVT-Insensitive Self-Dithered TDC Design by Utilizing a DS DLL, MWSCAS 2012, pp. 542 - 545, 2012.

[76] Shuli Geng,Woogeun Rhee,Zhihua Wang, A pulse-shaped power amplifier with dynamic bias switching for IR-UWB transmitters, ISCAS 2012, pp. 2529 - 2532, 2012.

[77] Wei Zhang,Woogeun Rhee,Zhihua Wang, A ΔΣ IR-UWB Radar with Sub-mm Ranging Capability for Human Body Monitoring Systems, ISCAS 2012, pp. 1315 - 1318, 2012.

[78] Deyuan Lin,Ni Xu,Woogeun Rhee,Zhihua Wang, An 11.7–17.2GHz digitally-controlled oscillator in 65nm CMOS for high-band UWB applications, ICSICT 2012, pp. 1 - 3, 2012.

[79] Yizhi Han,Woogeun Rhee,Zhihua Wang, Design and Analysis of a Robust All-Digital Clock Generation System with a DLL-based TDC, CECNet 2012, pp. 3152 - 3156, 2012.

[80] Shuli Geng,Xican Chen,Woogeun Rhee,Jongjin Kim,Dongwook Kim,Zhihua Wang, A Power-Efficient All-Digital IR-UWB Transmitter with Configurable Pulse Shaping by Utilizing a Digital Amplitude Modulation Technique, A-SSCC 2012, pp. 85 - 88, 2012.

[81] Ni Xu,Zhuo Zhang,Yuanfeng Sun,Woogeun Rhee,Zhihua Wang, Technology-Friendly Phase-Locked Loops, MWSCAS 2011, pp. 1 - 4, 2011.

[82] Hang Lv,Bo Zhou,Woogeun Rhee,Yongming Li,Zhihua Wang, A Relaxation Oscillator with Multi-Phase Triangular Waveform Generation, ISCAS 2011, pp. 2837 - 2840, 2011.

[83] Kun Gu,Liji Wu,Xiangyu Li,Xiangmin Zhang, Design and implementation of an electromagnetic analysis system for smart cards, CIS 2011, pp. 653 - 656, 2011.

[84] Yuanfeng Sun,Xueyi Yu,Woogeun Rhee,Sangsoo Ko,Wooseung Choo,Byeong-Ha Park,Zhihua Wang, Dual-Path LC VCO Design With Partitioned Coarse-Tuning Control in 65 nm CMOS, IEEE Microwave and Wireless Components Letters, Vol.20, No.3, pp. 169 - 171 , 2010.

[85] Xueyi Yu,Chengwen Liu,Woogeun Rhee,Zhihua Wang, Digitally controlled oscillator with FIR-embedded ΔΣ modulation, Electronic Letters, pp. 97 - 100, 2010.

[86] Jun Li,Ni Xu,Woogeun Rhee,Zhihua Wang, A -131dBc@1M PhaseNoise, 74% Spectral Efficiency, GA optimized FIR impulse radio UWB transmitter, PrimeAsia 2010, pp. 384 - 387, 2010.

[87] Chengwen Liu,Rui He,Xueyi Yu,Woogeun Rhee,Zhihua Wang, A Latency-Proof Quantization Noise Reduction Method for Digitally-Controlled Ring Oscillators, MWSCAS 2010, pp. 97 – 100, 2010.

[88] Woogeun Rhee,Ni Xu,Bo Zhou,Zhihua Wang, Low Power, Non Invasive UWB Systems for WBAN and Biomedical Applications, ICTC 2010, pp. 35 - 40, 2010.

[89] Cong Chen,Xiangyu Li,Liji Wu,Xiangmin Zhang, Design and implementation of a Differential Power Analysis System for cryptographic devices, ICSICT 2010, pp. 1967 - 1969, 2010.

[90] Rui He,Chengwen Liu,Xueyi Yu,Woogeun Rhee,Joon Young Park,Kyongsu Lee,Changhyun Kim,Zhihua Wang, A Low-Cost, Leakage-Insensitive Semi-Digital PLL with Linear Phase Detection And FIR-Embedded Digital Frequency Acquisition, A-SSCC 2010, pp. 1 - 4, 2010.

[91] Yutao Liu,Woogeun Rhee,Ziqiang Wang,Zhihua Wang, Power and jitter optimized VCO design using an on-chip supply noise monitoring circuit, APCCAS 2010, pp. 939 - 942, 2010.

[92] Jian Chen,Xueyu Yu,Li Yugen,Zhihua Wang, Customized Zero Frequency Control for Hybrid FIR Noise Filtering in ΔΣ Fractional-N PLL, ISCAS 2009, pp. 2401 - 2404, 2009.

[93] Rui He,Jun Li,Woogeun Rhee,Zhihua Wang, Transient Analysis of Nonlinear Settling Behavior in Charge-Pump Phase-Locked Loop Design, ISCAS 2009, pp. 469 - 472, 2009.

[94] Jun Li,Woogeun Rhee,Zhihua Wang, A Dual-Carrier IR-Based UWB Transmitter with Improved Spectral Efficiency, ICCCAS 2009, pp. 788 - 792, 2009.

Patents：

[1] Yugen Li，Yunzhao Nie，Zhihua Wang. Quasi balanced frequency shift keying modulation method and quasi balanced fm transmitter: China, 202210535280.0[P].

[2] Yugen Li，Su Han，Zhihua Wang. An Asymmetric Pulse UWB Transmitter System: China, 202210384491.9[P].

[3] Yugen Li,Bowen Wang, Zhihua Wang. A baseband modulation and demodulation circuit for self synchronizing pulse uwb signals: China, 202210302388.5[P]. 2023-03-14.

[4] Xiangyu Li,Yingyuan Zhao. Architecture of dynamic information flow tracing processor based on hardware security tag: China, 202210112760.6[P].

[5] Xiangyu Li, Ye Ruan, Shuxian Chen. Dynamic handwritten signature recognition method, device and electronic equipment: China, 202111667092.5[P].

[6] Xiangyu Li, Pixi Kang. Online semi supervised learning classifier and its classification method for radar pose recognition: China, 202111265556.X[P].

[7] Xiangyu Li. Stream processor for extracting features of stream data in transmission process and implementation method thereof: China, 202110433608.3[P]. 2022-10-04.

[8] Woogeun Rhee, Zixiang Wan, Zhihua Wang. Universal frequency modulator and frequency modulation method and device: China, 202110262312.X[P].

[9] Woogeun Rhee, Bowen Wang, Zhihua Wang. Quasi-coherent pulse ultra-wideband receiver and signal demodulation method: China, 202110229180.0[P]. 2022-4-12.

[10] Xiangyu Li, Xiaomin Zheng. Gesture recognition method and related equipment: China, 202010774742.5[P].

[11] Liji Wu, Jian Wu, Xiangmin Zhang, Xiangyu Li, Dewei Wang. System and method for actively defending hardware Trojan on storage path: China, 202010294220.5[P].

[12] Xiangyu Li. Extensible reconfigurable switch packet parser basic processing unit structure: China, 201911126256.6[P]. 2020-11-27.

[13] Xiangyu li, Feifei Zhou. Feature pre-aligned random forest classifier for gesture recognition and classification method: China, 201910381675.8[P]. 2021-05-28.

[14] Woogeun Rhee, Haixin Song, Zhihua Wang. Relay attack defense method and system based on pulse flight time ranging: China, 201910093208.5[P]. 2021-05-28.

[15] Xiangyu Li, Fang Yang. Reconfigurable switch forwarding engine analyzer capable of destroying hardware Trojan: China, 201910003982.2[P]. 2020-05-12.

[16] Woogeun Rhee, Yining Zhang, Ranran Zhou, Zhihua Wang. Circuit system and control method for directly demodulating frequency modulated signal based on phase-locked loop: China, 201811150180.6[P].

[17] Woogeun Rhee, Yining Zhang, Ranran Zhou, Zhihua Wang. Circuit system based on direct demodulation frequency modulated signal of phase -locked loop: China, 201821608143.0[P]. 2019-02-26.

[18] Liji Wu, Tangshengsheng Li, Xiangyu Li, Xiangmin Zhang, Xingjun Wu. Encryption and decryption methods suitable for high-speed data transmission path: China, 201811103211.2[P]. 2020-06-02.

[19] Woogeun Rhee, Yining Zhang, Ranran Zhou, Zhihua Wang. Frequency modulation signal demodulation system for detecting narrowband interference or channel change: China, 201810368445.3[P].

[20] Yajun He, Ziqiang Wang, Woogeun Rhee, Han Liu, Chun Zhang, Zhihua Wang, Fule Li. A multi-protocol phase-locked loop: China, 201611104156.X[P]. 2018-10-19.

[21] Xiangyu Li, Xianfeng Xiao, Yongchang Liu. Compatible accelerator extension method for embedded system: China, 201610192047.1[P]. 2019-01-29.

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