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Backside optimization for improving avalanche breakdown behavior of 4.5 kV IGBT

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Journal of Semico.ductors 2015年第3期36卷 85-87页

作者：田晓丽陆江滕渊张文亮卢烁今朱阳军 Institute of microelectronics Chinese Academy of Sciences shanghai Lianxing Electronics co. Ltd

The static avalanche breakdown behavior of 4.5 kV high-voltage IGBT is studied by theory analysis and experiment. The avalanche breakdown behaviors of the 4.5 kV IGBTs with different backside structures are investigated and co.pared by using the curve tracer. The results show that the snap back behavior of the breakdown waveform is related to the bipolar PNP gain, which leads to the deterioration of the breakdown voltage. There are two ways to optimize the backside structure, one is increasing the implant dose of the N^＋ buffer layer, the other is decreasing the implant dose of the P^＋ co.lector layer. It is found that the optimized structure is effective in suppressing the snap back behavior and improving the breakdown characteristic of high voltage IGBT.

关键词： avalanche breakdown snap back bipolar transistor gain high voltage IGBT

Power duality for multi-antenna OFDM system in broadcast channel with user scheduling

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第2期9卷 215-224页

作者： Feng SHE Han-wen LUO Lei CHEN Hua XIA Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Datang microelectronics Technology co. Ltd. Beijing 100083 China

This paper deals with design and analysis of user scheduling and power allocation for multi-antenna OFDM systems with DPC,ZF-DPC,ZF-BF and TDMA transmit *** co.sider the general multi-user downlink scheduling problem and power minimization with multi-user rate *** to the channel state,it is shown that there is a power optimal policy which selects a subset of users in each scheduling *** present user selection algorithms for DPC,ZF-DPC,ZF-BF and TDMA for multi-antenna OFDM system in broadcast channels,and we also present the practical water-filling solution in this *** the selected users with the co.sideration of fairness,we derive the power optimization algorithm with multi-user rate *** also analyze the power duality of uplink-downlink for the transmit strategies of DPC,ZF-DPC and *** results show that the present user-scheduling algorithm and power minimization algorithm can achieve good power performance,and that the scheduling algorithm can guarantee fairness.

关键词： Multiple-input multiple-output (MIMO) Orthogonal frequency division multiplexing (OFDM) Broadcast channel Multi-user diversity Dirty paper co.ing (DPC) Downlink scheduling

A 10-bit 80-MS/s opamp-sharing pipelined ADC with a switch-embedded dual-input MDAC

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Journal of Semico.ductors 2011年第2期32卷 102-107页

作者：尹睿廖友春张卫唐长文 ASIC & System State Key Laboratory Fudan University China Ratio microelectronics co. Ltd Ratio microelectronics co.Ltd

A 10-bit 80-MS/s opamp-sharing pipelined ADC is implemented in a 0.18μm CMOS. An opamp- sharing MDAC with a switch-embedded dual-input opamp is proposed to eliminate the non-resetting and successive-stage crosstalk problems observed in the co.ventional opamp-sharing technique. The ADC achieves a peak SNDR of 60.1 dB （ENOB = 9.69 bits） and a peak SFDR of 76 dB, while maintaining more than 9.6 ENOB for the full Nyquist input bandwidth. The co.e area of the ADC is 1.1 mm2 and the chip co.sumes 28 mW with a 1.8 V power supply.

关键词： pipelined ADC opamp-sharing low power switch-embedded dual-input MDAC

Evaluating and Improving Linear Regression Based Profiling:On the Selection of Its Regularization

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Journal of co.puter Science & Technology 2020年第5期35卷 1175-1197页

作者： Xiang-Jun Lu Chi Zhang Da-Wu Gu Jun-Rong Liu Qian Peng Hai-Feng Zhang School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China ZhiXun Crypto Testing and Evaluation Technology co.Ltd. Shanghai 200240China Department of microelectronics and Nanoelectronics Tsinghua UniversityBeijing 100084China Beijing Smartchip microelectronics Technology co. Ltd.Beijing 100082China

Side-channel attacks(SCAs)play an important role in the security evaluation of cryptographic *** a form of SCAs,profiled differential power analysis(DPA)is among the most powerful and efficient by taking advantage of a profiling phase that learns features from a co.trolled *** regression(LR)based profiling,a special profiling method proposed by Schindler et al.,co.ld be extended to generic-emulating DPA(differential power analysis)by on-the-fly *** formal extension was proposed by Whitnall et *** SLR-based ***,to improve SLR-based method,Wang et *** a method based on ridge ***,the co.stant format of L-2 penalty still limits the performance of *** this paper,we generalize the ridge-based method and propose a new strategy of using variable *** then analyze from a theoretical point of view why we should not use co.stant penalty format for all *** speaking,our work reveals the underlying mechanism of how different formats affect the profiling process in the co.text of side ***,by selecting a proper regularization,we co.ld push the limits of LR-based ***,we co.duct simulation-based and practical experiments to co.firm our ***,the results of our practical experiments show that the proper formats of regularization are different among real devices.

关键词： side-channel attack(SCA) cryptography linear regression based profiling generic-emulating differential power analysis regularization

A 0.23 pJ 11.05-bit ENOB 125-MS/s pipelined ADC in a 0.18 μm CMOS process

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Journal of Semico.ductors 2015年第5期36卷 170-174页

作者：王勇张剑云尹睿赵宇航张卫 State Key Laboratory of ASIC & System School of MicroelectronicsFudan University shanghai Integrated Circuit Research and Development Center co. Ltd.

This paper describes a 12-bit 125-MS/spipelinedanalog-to-digitalco.verter（ADC）thatisimplemented in a 0.18 #m CMOS process. A gate-bootstrapping switch is used as the bottom-sampling switch in the first stage to enhance the sampling linearity. The measured differential and integral nonlinearities of the prototype are less than 0.79 least significant bit （LSB） and 0.86 LSB, respectively, at the full sampling rate. The ADC exhibits an effective number of bits （ENOB） of more than 11.05 bits at the input frequency of 10.5 MHz. The ADC also achieves a 10.5 bits ENOB with the Nyquist input frequency at the full sample rate. In addition, the ADC co.sumes 62 mW from a 1.9 V power supply and occupies 1.17 mm2, which includes an on-chip reference buffer. The figure-of-merit of this ADC is 0.23 p J/step.

关键词： analog-to-digital co.verter sample-and-hold Nyquist rate input frequency

A 77 GHz FMCW MIMO radar system based on 65nm CMOS cascadable 2T3R transceiver

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Science China(Information Sciences) 2021年第1期64卷 239-241页

作者： Taikun MA Zipeng CHEN Jianxi WU Wei ZHENG Shufu WANG Nan QI Min LIN Baoyong CHI Institute of microelectronics Tsinghua University Radarchip Technology co. Ltd. 3. Institute of SemiconductorsChinese Academy of Sciences 4. Shanghai Institute for Advanced Communication and Data ScienceKey Laboratory of Specialty Fiber Optics and Optical Access NetworksShanghai University

In recent years,many studies on millimeter-wave (mm-wave)radar have been published [1-3].co.pared with other traditional vision sensors like ultrasound,camera,and laser radar,mm-wave radar is more attractive owing to its low co.t,high resolution,high integration,and strong robustness against bad ***-modulated co.tinuouswave (FMCW) radar is the most widely studied mm-wave radar because of its simple structure,easy realization,and powerful *** present,the research of mm-wave radar mainly focuses on two frequency bands,24 GHz and77 *** them,the research on 24 GHz radar has started earlier and is more mature *** is mainly used in car’s advanced driving assistant systems (ADAS).co.-

关键词： Millimeter-wave radar frequency modulated co.tinue-wave (FMCW) MIMO Capon beamformer series-fed patch antenna

A co.pact MIMO automotive radar using phase-aligned daisy-chain cascading topology and elevation co.pensation for 2D angle estimation

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Science China(Information Sciences) 2023年第6期66卷 222-241页

作者： Rui ZHOU Jixin CHEN Yan HUANG Gang XU Debin HOU Bangjie ZHANG Zekun LI Yu XIANG Wei HONG State Key Laboratory of Millimeter Waves Southeast University Purple Mountain Laboratories 3. MiSic microelectronics co. Ltd.

To design a high-performance multiple-input multiple-output(MIMO)automotive radar system with simple hardware architecture, this study presents a daisy-chain cascading design scheme, implementing the two-dimensional(2D)nonuniform antenna array with high-gain antennas for 2D angle estimation. The improvements in the designed radar system are primarily divided into three parts. First, a daisy-chain cascading topology will cause severe phase deviations; hence, we rigorously analyzed the influence of the phase deviations and proposed a low-co.t phase-alignment procedure to address this co.cern. Seco.d, to obtain 2D angular resolution and a longer working range with limited channels, a novel 2D antenna array design principle facilitating the arrangement of high-gain antennas was presented. Third, a new phase co.pensation procedure was developed to mitigate the deterioration of angular accuracy in the elevation plane. Based on the proposed design scheme, a frequency-modulated co.tinuous-wave(FMCW)radar prototype with two transceiver chips, i.e., six transmitters and eight receivers, was successfully built. The prototype radar system’s performance was tested through an anechoic chamber and outdoor experiments. co.sequently,an angular resolution of 3.5° in azimuth and 12.5° in elevation was featured in the anechoic ***, using the 2D co.ventional beam-forming, the outdoor experiment captured high-resolution 2D angular estimation results, thus demonstrating the superior performance of the designed prototype system.

关键词： frequency-modulated co.tinuous-wave radar prototype FMCW multiple-input-multiple-output MIMO phase-alignment daisy-chained cascading topology 2D antenna design elevation co.pensation

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To co.struct High Level Secure co.munication System： CTMI Is Not Enough

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China co.munications 2018年第11期15卷 122-137页

作者： Sen Xu Xiangjun Lu Aidong Chen Haifeng Zhang Haihua Gu Dawu Gu Kaiyu Zhang Zheng Guo Junrong Liu Department of co.puter Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Software Engineering Beijing Union University Beijing 100 101 China Wanda Internet Technology Group Shanghai 200127 China Beijing Smart-Chip microelectronics Technology co. Ltd. Beijing China

Public key cryptographic （PKC） algorithms, such as the RSA, elliptic curve digital signature algorithm （ECDSA） etc., are widely used in the secure co.munication sys- tems, such as OpenSSL, and a variety of in- formation security systems. If designer do not securely implement them, the secret key will be easily extracted by side-channel attacks （SCAs） or co.binational SCA thus mitigat- ing the security of the entire co.munication system. Previous co.ntermeasures of PKC im- plementations focused on the co.e part of the algorithms and ignored the modular inversion which is widely used in various PKC schemes. Many researchers believe that instead of straightforward implementation, co.stant time modular inversion （CTMI） is enough to resist the attack of simple power analysis co.bined with lattice analysis. However, we find that the CTMI security can be reduced to a hidden t-bit multiplier problem. Based on this feature, we firstly obtain Hamming weight of interme- diate data through side-channel leakage. Then, we propose a heuristic algorithm to solve the problem by revealing the secret （partial and full） base of CTMI. co.paring previous nec-essary input message for masking filtering, our procedure need not any information about the secret base of the inversion. To our knowl- edge, this is the first time for evaluating the practical security of CTM! and experimental results show the fact that CTMI is not enough for high-level secure co.munication systems.

关键词： information security side channelanalysis elliptic curve digital signature algo-rithm co.stant time modular inversion ham-ming weight leakage

High Performance SAR ADC with Mismatch co.rection Latch and Improved co.parator Clock

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Journal of shanghai Jiaotong university(Science) 2019年第3期24卷 335-340页

作者： LIAN Pengfei WU Bin WANG Han PU Yilin CHEN Chengying No. 808 Institute of shanghai Academy of Spaceflight Technology Shanghai 201109China Institute of microelectronics Chinese Academy of SciencesBeijing 100029China Analog and RF Department Beijing Casemic Electronic Technologies Co.Ltd.Beijing 100029China School of microelectronics Xiamen University of TechnologyXiamen 361024FujianChina

We propose a high performance 10-bit 100-MS/s(million samples per seco.d)successive approximation register(SAR)analog-to-digital co.verter(ADC)with mismatch co.rection latch and improved co.parator *** a high-low supply voltage technology,the bias output impedance of the preamplifier of the co.parator is ***,the co.mon mode rejection ratio(CMRR)of the co.parator is improved,and further diminishing the signal-dependent offset caused by the input co.mon-mode voltage variation.A digital-to-analog co.verter(DAC)co.trol signal co.rection latch is proposed to co.rect the co.trol signal error resulted from process *** 30-point Monte Carlo mismatch simulated results demonstrate that the minimum spurious-free dynamic range(SFDR)of the ADC is improved by 2 dB with this co.rection *** ensure sufficient high bit switching time of the DAC and sufficient low bit co.parison time of the co.parator,a data selector used in the co.parator clock is *** optimized time distribution improves the performance of the SAR *** prototype was fabricated using a one-poly-eight-metal(1 P8 M)55 nm co.plementary metal oxide semico.ductor(CMOS)*** measured results at 1.3 V/1.5 V supply and 100-MS/s,the ADC achieves a signalto-noise and distortion ratio(SNDR)of 59.4 dB and co.sumes 2.1 mW,resulting in a figure of merit(FOM)of31 fJ/*** addition,the active area of the ADC is 0.018 8 mm2.

关键词： analog-to-digital co.verter successive approximation register high-low supply voltage mismatch co.rection data selector