default search action
IEEE Transactions on Circuits and Systems I: Regular Papers, Volume 68
Volume 68, Number 1, January 2021
- Elena Blokhina:
Special Issue on the IEEE Asia Pacific Conference of Circuits and Systems 2019 and the IEEE International Conference on Electronics, Circuits and Systems 2019. 1-2 - Elia Arturo Vallicelli, Andrea Baschirotto, Sebastian Lehrack, Walter Assmann, Katia Parodi, Salvatore Viola, Giorgio Riccobene, Marcello De Matteis:
22 dB Signal-to-Noise Ratio Real-Time Proton Sound Detector for Experimental Beam Range Verification. 3-13 - Mauro Di Marco, Mauro Forti, Fernando Corinto, Leon O. Chua:
Unfolding Nonlinear Dynamics in Analogue Systems With Mem-Elements. 14-24 - Vikram Jain, Christoffer Fougstedt, Per Larsson-Edefors:
Variable-Rate VLSI Architecture for 400-Gb/s Hard-Decision Product Decoder. 25-34 - Maurizio Ciampa:
Active Circuits With Diodes: Topological Conditions Sufficient to Determine the State of a Diode. 35-44 - Arianna Rubino, Can Livanelioglu, Ning Qiao, Melika Payvand, Giacomo Indiveri:
Ultra-Low-Power FDSOI Neural Circuits for Extreme-Edge Neuromorphic Intelligence. 45-56 - Enne Wittenhagen, Marcel Runge, Nima Lotfi, Hossein Ghafarian, Yuan Tian, Friedel Gerfers:
Advanced Mixed Signal Concepts Exploiting the Strong Body-Bias Effect in CMOS 22FDX®. 57-66 - Ren Arakawa, Naoya Onizawa, Jean-Philippe Diguet, Takahiro Hanyu:
Multi-Context TCAM-Based Selective Computing: Design Space Exploration for a Low-Power NN. 67-76 - Luca Mocerino, Andrea Calimera:
Fast and Accurate Inference on Microcontrollers With Boosted Cooperative Convolutional Neural Networks (BC-Net). 77-88 - Xiaoteng Zhao, Yong Chen, Pui-In Mak, Rui Paulo Martins:
A 0.14-to-0.29-pJ/bit 14-GBaud/s Trimodal (NRZ/PAM-4/PAM-8) Half-Rate Bang-Bang Clock and Data Recovery (BBCDR) Circuit in 28-nm CMOS. 89-102 - Thinh Tran-Dinh, Hieu Minh Pham, Loan Pham-Nguyen, Sang-Gug Lee, Hanh-Phuc Le:
Power Management IC With a Three-Phase Cold Self-Start for Thermoelectric Generators. 103-113 - Maximilian Reuter, Johannes Pfau, Tillmann A. Krauss, Jürgen Becker, Klaus Hofmann:
From MOSFETs to Ambipolar Transistors: Standard Cell Synthesis for the Planar RFET Technology. 114-125 - Dawei Mai, Michael Peter Kennedy:
MASH-Based Divider Controllers for Mitigation of Wandering Spurs in a Fractional-N Frequency Synthesizer. 126-137 - Axel Laborieux, Marc Bocquet, Tifenn Hirtzlin, Jacques-Olivier Klein, Etienne Nowak, Elisa Vianello, Jean-Michel Portal, Damien Querlioz:
Implementation of Ternary Weights With Resistive RAM Using a Single Sense Operation Per Synapse. 138-147 - Walter Ciccognani, Sergio Colangeli, Patrick E. Longhi, Antonio Serino, Rocco Giofrè, Lorenzo Pace, Ernesto Limiti:
Broadband Amplifier Design Technique by Dissipative Matching Networks. 148-160 - Arthur Perodou, Anton Korniienko, Gérard Scorletti, Mykhailo Zarudniev, Jean-Baptiste David, Ian O'Connor:
Frequency Design of Lossless Passive Electronic Filters: A State-Space Formulation of the Direct Synthesis Approach. 161-174 - Alice Lanniel, Tobias Boeser, Thomas Alpert, Maurits Ortmanns:
Noise Analysis of Charge-Balanced Readout Circuits for MEMS Accelerometers. 175-184 - Neha Priyadarshini, Mukul Sarkar:
A 2erms- Temporal Noise CMOS Image Sensor With In-Pixel 1/f Noise Reduction and Conversion Gain Modulation for Low Light Imaging. 185-195 - Zheng Sun, Hanli Liu, Hongye Huang, Dexian Tang, Dingxin Xu, Tohru Kaneko, Zheng Li, Jian Pang, Rui Wu, Wei Deng, Atsushi Shirane, Kenichi Okada:
A 0.85mm2 BLE Transceiver Using an On-Chip Harmonic-Suppressed RFIO Circuitry With T/R Switch. 196-209 - Ismail Kara, Mustafa Becermis, Mohamed Abdel-Aal Kamar, Mustafa Aktan, Hakan Dogan, Senol Mutlu:
A 70-to-2 V Triboelectric Energy Harvesting System Utilizing Parallel-SSHI Rectifier and DC-DC Converters. 210-223 - Benqing Guo, Jing Gong, Yao Wang:
A Wideband Differential Linear Low-Noise Transconductance Amplifier With Active-Combiner Feedback in Complementary MGTR Configurations. 224-237 - Xiaoxiao Liu, Mengjie Mao, Xiuyuan Bi, Hai Helen Li, Yiran Chen:
Exploring Applications of STT-RAM in GPU Architectures. 238-249 - Tian Yuan, Weiqiang Liu, Jie Han, Fabrizio Lombardi:
High Performance CNN Accelerators Based on Hardware and Algorithm Co-Optimization. 250-263 - Xiaoyuan Wang, Pengfei Zhou, Jason Kamran Eshraghian, Chih-Yang Lin, Herbert Ho-Ching Iu, Ting-Chang Chang, Sung-Mo Steve Kang:
High-Density Memristor-CMOS Ternary Logic Family. 264-274 - Saeed Haghiri, Ali Naderi, Behzad Ghanbari, Arash Ahmadi:
High Speed and Low Digital Resources Implementation of Hodgkin-Huxley Neuronal Model Using Base-2 Functions. 275-287 - Jiliang Zhang, Chaoqun Shen:
Set-Based Obfuscation for Strong PUFs Against Machine Learning Attacks. 288-300 - Xuan Hu, Amy S. Abraham, Jean Anne C. Incorvia, Joseph S. Friedman:
Hybrid Pass Transistor Logic With Ambipolar Transistors. 301-310 - Ningyuan Yin, Baofa Huang, Xiaobai Chen, Jianjun Chen, Zhiyi Yu:
An MTJ-Based Asynchronous System With Extremely Fine-Grained Voltage Scaling. 311-321 - Mario Garrido, Pedro Malagón:
The Constant Multiplier FFT. 322-335 - Pablo Pascual Campo, Alberto Brihuega, Lauri Anttila, Matias Turunen, Dani Korpi, Markus Allén, Mikko Valkama:
Gradient-Adaptive Spline-Interpolated LUT Methods for Low-Complexity Digital Predistortion. 336-349 - Jeeson Kim, Vladimir Kornijcuk, Changmin Ye, Doo Seok Jeong:
Hardware-Efficient Emulation of Leaky Integrate-and-Fire Model Using Template-Scaling-Based Exponential Function Approximation. 350-362 - Xiaona Song, Jingtao Man, Shuai Song, Choon Ki Ahn:
Finite/Fixed-Time Anti-Synchronization of Inconsistent Markovian Quaternion-Valued Memristive Neural Networks With Reaction-Diffusion Terms. 363-375 - Zhiyi Chen, Xinghuo Yu, Wenying Xu, Guanghui Wen:
Modeling and Control of Islanded DC Microgrid Clusters With Hierarchical Event-Triggered Consensus Algorithm. 376-386 - Chunmei Wang, Xiangyong Chen, Jinde Cao, Jianlong Qiu, Yang Liu, Yiping Luo:
Neural Network-Based Distributed Adaptive Pre-Assigned Finite-Time Consensus of Multiple TCP/AQM Networks. 387-395 - Yonghun Kim, Seok-Kyoon Kim, Choon Ki Ahn:
Variable Cut-Off Frequency Observer-Based Positioning for Ball-Beam Systems Without Velocity and Current Feedback Considering Actuator Dynamics. 396-405 - Eugene Koskin, Pierre Bisiaux, Dimitri Galayko, Elena Blokhina:
All Digital Phase-Locked Loop Networks for Clock Generation and Distribution: Network Stability, Convergence and Performance. 406-415 - Liheng Chen, Ming Liu, Yan Shi, Haijun Zhang, Enjiao Zhao:
Adaptive Fault Estimation for Unmanned Surface Vessels With a Neural Network Observer Approach. 416-425 - Min Zhao, Chen Peng, Engang Tian:
Finite-Time and Fixed-Time Bipartite Consensus Tracking of Multi-Agent Systems With Weighted Antagonistic Interactions. 426-433 - Yue Yang, Dezhi Xu, Tiedong Ma, Xiaojie Su:
Adaptive Cooperative Terminal Sliding Mode Control for Distributed Energy Storage Systems. 434-443 - Zhen-Hua Zhu, Bin Hu, Zhi-Hong Guan, Ding-Xue Zhang, Tao Li:
Observer-Based Bipartite Containment Control for Singular Multi-Agent Systems Over Signed Digraphs. 444-457 - Jing Wang, Tingting Ru, Jianwei Xia, Hao Shen, Victor Sreeram:
Asynchronous Event-Triggered Sliding Mode Control for Semi-Markov Jump Systems Within a Finite-Time Interval. 458-468 - Marijn Verbeke, Guy Torfs, Pieter Rombouts:
The Truth About 2-Level Transition Elimination in Bang-Bang PAM-4 CDRs. 469-482 - Zhenshan Xie, Xinmiao Zhang:
Fast Nested Key Equation Solvers for Generalized Integrated Interleaved Decoder. 483-495 - Dmitri V. Truhachev, Kamal El-Sankary, Alireza Karami, Abolfazl Zokaei, Shizhong Li:
Efficient Implementation of 400 Gbps Optical Communication FEC. 496-509 - Mansour Taghadosi, Hossein Kassiri:
A Real-Time-Link-Adaptive Operation Scheme for Maximum Energy Storage Efficiency in Resonant CM Wireless Power Receivers. 510-523 - Blanca Areli Martínez-Treviño, Abdelali El Aroudi, Angel Cid-Pastor, Germain Garcia, Luis Martínez-Salamero:
Synthesis of Constant Power Loads Using Switching Converters Under Sliding-Mode Control. 524-535 - Abdulqader Nael Mahmoud, Frederic Vanderveken, Christoph Adelmann, Florin Ciubotaru, Sorin Cotofana, Said Hamdioui:
Spin Wave Normalization Toward All Magnonic Circuits. 536-549 - Guoxiang Han, Peter R. Kinget:
Comments on "Architectural Evolution of Integrated M-Phase High-Q Bandpass Filters". 550-552 - Ahmad Mirzaei, Hooman Darabi, David Murphy:
Reply to Comments on "Architectural Evolution of Integrated M-Phase High-Q Bandpass Filters". 553
Volume 68, Number 2, February 2021
- Wenning Jiang, Yan Zhu, Chi-Hang Chan, Boris Murmann, Rui Paulo Martins:
A 7-bit 2 GS/s Time-Interleaved SAR ADC With Timing Skew Calibration Based on Current Integrating Sampler. 557-568 - Mykhailo Tymchenko, Aravind Nagulu, Harish Krishnaswamy, Andrea Alù:
Universal Frequency-Domain Analysis of N-Path Networks. 569-580 - Jebreel M. Salem, Fariborz Lohrabi Pour, Dong Sam Ha:
A High-Temperature Model for GaN-HEMT Transistors and its Application to Resistive Mixer Design. 581-591 - Jennifer Hasler, Sahil Shah:
An SoC FPAA Based Programmable, Ladder-Filter Based, Linear-Phase Analog Filter. 592-602 - Bangan Liu, Yuncheng Zhang, Junjun Qiu, Huy Cu Ngo, Wei Deng, Kengo Nakata, Toru Yoshioka, Jun Emmei, Jian Pang, Aravind Tharayil Narayanan, Haosheng Zhang, Teruki Someya, Atsushi Shirane, Kenichi Okada:
A Fully Synthesizable Fractional-N MDLL With Zero-Order Interpolation-Based DTC Nonlinearity Calibration and Two-Step Hybrid Phase Offset Calibration. 603-616 - Xueyong Zhang, Jyotibdha Acharya, Arindam Basu:
A 0.11-0.38 pJ/cycle Differential Ring Oscillator in 65 nm CMOS for Robust Neurocomputing. 617-630 - Armin Tajalli:
Power-Speed Trade-Offs in Design of Scaled FET Circuits Using C/IDS Methodology. 631-640 - Yuefeng Cao, Shumin Zhang, Tianli Zhang, Yongzhen Chen, Yutong Zhao, Chixiao Chen, Fan Ye, Junyan Ren:
A 91.0-dB SFDR Single-Coarse Dual-Fine Pipelined-SAR ADC With Split-Based Background Calibration in 28-nm CMOS. 641-654 - Arpit Sourav Mohapatra, Karabi Biswas:
A Fractional Order Notch Filter to Compensate the Attenuation-Loss Due to Change in Order of the Circuit. 655-666 - Chengshuo Yu, Taegeun Yoo, Hyunjoon Kim, Tony Tae-Hyoung Kim, Kevin Chai Tshun Chuan, Bongjin Kim:
A Logic-Compatible eDRAM Compute-In-Memory With Embedded ADCs for Processing Neural Networks. 667-679 - Francesco Centurelli, Giuseppe Scotti, Alessandro Trifiletti, Gaetano Palumbo:
Design of Low-Voltage Power Efficient Frequency Dividers in Folded MOS Current Mode Logic. 680-691 - Kota Shiba, Tatsuo Omori, Kodai Ueyoshi, Shinya Takamaeda-Yamazaki, Masato Motomura, Mototsugu Hamada, Tadahiro Kuroda:
A 96-MB 3D-Stacked SRAM Using Inductive Coupling With 0.4-V Transmitter, Termination Scheme and 12: 1 SerDes in 40-nm CMOS. 692-703 - Lin Bai, Yecheng Lyu, Xinming Huang:
RoadNet-RT: High Throughput CNN Architecture and SoC Design for Real-Time Road Segmentation. 704-714 - Fei Lyu, Xiaoqi Xu, Yu Wang, Yuanyong Luo, Yuxuan Wang, Hongbing Pan:
Ultralow-Latency VLSI Architecture Based on a Linear Approximation Method for Computing Nth Roots of Floating-Point Numbers. 715-727 - Zihan Xia, Jienan Chen, Qiu Huang, Jinting Luo, Jianhao Hu:
Neural Synaptic Plasticity-Inspired Computing: A High Computing Efficient Deep Convolutional Neural Network Accelerator. 728-740 - Xinyu Wang, Huaguo Liang, Yanjie Wang, Liang Yao, Yang Guo, Maoxiang Yi, Zhengfeng Huang, Haochen Qi, Yingchun Lu:
High-Throughput Portable True Random Number Generator Based on Jitter-Latch Structure. 741-750 - Foroozan Karimzadeh, Ningyuan Cao, Brian Crafton, Justin Romberg, Arijit Raychowdhury:
A Hardware-Friendly Approach Towards Sparse Neural Networks Based on LFSR-Generated Pseudo-Random Sequences. 751-764 - Jennifer Hasler, Aishwarya Natarajan:
Continuous-Time, Configurable Analog Linear System Solutions With Transconductance Amplifiers. 765-775 - Wenle Zhang, Shuai Mao, Jiahao Huang, Ljupco Kocarev, Yang Tang:
Data-Driven Resilient Control for Linear Discrete-Time Multi-Agent Networks Under Unconfined Cyber-Attacks. 776-785 - Wenhai Qi, Guangdeng Zong, Wei Xing Zheng:
Adaptive Event-Triggered SMC for Stochastic Switching Systems With Semi-Markov Process and Application to Boost Converter Circuit Model. 786-796 - Pengcheng Chen, Li Yu, Dan Zhang:
Event-Triggered Sliding Mode Control of Power Systems With Communication Delay and Sensor Faults. 797-807 - Feng Shu, Junyong Zhai:
Dynamic Event-Triggered Tracking Control for a Class of p-Normal Nonlinear Systems. 808-817 - Hao Shen, Mengping Xing, Shengyuan Xu, Michael V. Basin, Ju H. Park:
H∞ Stabilization of Discrete-Time Nonlinear Semi-Markov Jump Singularly Perturbed Systems With Partially Known Semi-Markov Kernel Information. 818-828 - Jialong Zhang, Pu Zhang, Jianguo Yan:
Distributed Adaptive Finite-Time Compensation Control for UAV Swarm With Uncertain Disturbances. 829-841 - Qing-Hao Zhang, Jun-Guo Lu, Ying-Dong Ma, Yang-Quan Chen:
Time Domain Solution Analysis and Novel Admissibility Conditions of Singular Fractional-Order Systems. 842-855 - Sha Fan, Huaicheng Yan, Hao Zhang, Hao Shen, Kaibo Shi:
Dynamic Event-Based Non-Fragile Dissipative State Estimation for Quantized Complex Networks With Fading Measurements and Its Application. 856-867 - Seyyed-Amir Ayati, Amirreza Alizadeh, Sayfe Kiaei:
CMOS Full-Duplex Mixer-First Receiver With Adaptive Self-Interference Cancellation. 868-878 - Hangxuan Cui, Fakhreddine Ghaffari, Khoa Le, David Declercq, Jun Lin, Zhongfeng Wang:
Design of High-Performance and Area-Efficient Decoder for 5G LDPC Codes. 879-891 - Seongjin Bae, Dongmin Kim, Dongmyeong Kim, Ilku Nam, Donggu Im:
A Reconfigurable Passive Mixer-Based Sub-GHz Receiver Front-End for Fast Spectrum Sensing Functionality. 892-903 - Tsung-Hsien Liu, Shih-Lun Wang, You-Jia Lin, Yin-Tsung Hwang, Chiao-En Chen, Yuan-Sun Chu:
Fixed-Complexity Tree Search Schemes for Detecting Generalized Spatially Modulated Signals: Algorithms and Hardware Architectures. 904-917 - Jianbo Chen, Dong Yue, Chunxia Dou, Ye Li, Gerhard P. Hancke, Shengxuan Weng, Josep M. Guerrero, Xiaohua Ding:
Distributed Control of Multi-Functional Grid-Tied Inverters for Power Quality Improvement. 918-928 - Zhi-Juan Liao, Shuai Ma, Qi-Kai Feng, Chenyang Xia, Dongsheng Yu:
Frequency Splitting Elimination and Utilization in Magnetic Coupling Wireless Power Transfer Systems. 929-939 - Vardan Saxena, Nishant Kumar, Bhim Singh, Bijaya Ketan Panigrahi:
A Rapid Circle Centre-Line Concept-Based MPPT Algorithm for Solar Photovoltaic Energy Conversion Systems. 940-949 - Minggang Chen, Shen Xu, Linlin Huang, Weifeng Sun, Longxing Shi:
A Novel Digital Control Method of Primary-Side Regulated Flyback With Active Clamping Technique. 950-962
Volume 68, Number 3, March 2021
- Enrique Alvarez-Fontecilla, Amr I. Eissa, Eslam Helal, Colin Weltin-Wu, Ian Galton:
Delta-Sigma FDC Enhancements for FDC-Based Digital Fractional-N PLLs. 965-974 - Weiyu Leng, Asad A. Abidi:
Approximate Equivalent Circuits to Understand Tradeoffs in Geometry of On-Chip Inductors. 975-988 - Saleh Karman, Francesco Tesolin, Salvatore Levantino, Carlo Samori:
A Novel Topology of Coupled Phase-Locked Loops. 989-997 - Gianluca Giustolisi, Gaetano Palumbo:
Design of Three-Stage OTA Based on Settling-Time Requirements Including Large and Small Signal Behavior. 998-1011 - Jaeduk Han, Woo-Rham Bae, Eric Chang, Zhongkai Wang, Borivoje Nikolic, Elad Alon:
LAYGO: A Template-and-Grid-Based Layout Generation Engine for Advanced CMOS Technologies. 1012-1022 - Sanjeev Tannirkulam Chandrasekaran, Akshay Jayaraj, Vinay Elkoori Ghantala Karnam, Imon Banerjee, Arindam Sanyal:
Fully Integrated Analog Machine Learning Classifier Using Custom Activation Function for Low Resolution Image Classification. 1023-1033 - Da Lin, Xiaozhong Liao, Lei Dong, Ruocen Yang, Samson S. Yu, Herbert Ho-Ching Iu, Tyrone Fernando, Zhen Li:
Experimental Study of Fractional-Order RC Circuit Model Using the Caputo and Caputo-Fabrizio Derivatives. 1034-1044 - Erjia Shi, Xian Tang, Kong-Pang Pun:
A 270 nW Switched-Capacitor Acoustic Feature Extractor for Always-On Voice Activity Detection. 1045-1054 - Alexander Zakharov:
Parametric and Structural-Parametric Synthesis of Nonuniform Transmission Line Resonators. 1055-1067 - Tom R. Molderez, Korneel Rabaey, Marian Verhelst:
A Scalable 128-Channel, Time-Multiplexed Potentiostat for Parallel Electrochemical Experiments. 1068-1079 - Pawan Agarwal, Mohammad Chahardori, Deukhyoun Heo:
A New Boosted Active-Capacitor With Negative-Gm for Wide Tuning Range VCOs. 1080-1090 - Dongfang Pan, Zongming Duan, Bowen Wu, Yan Wang, Dong Huang, Yan Wang, Liguo Sun, Ping Gui, Lin Cheng:
A 76-81-GHz Four-Channel Digitally Controlled CMOS Receiver for Automotive Radars. 1091-1101 - Jing Li, Yuyu Lin, Ning Ning, Qi Yu:
A +0.44°C/-0.4°C Inaccuracy Temperature Sensor With Multi-Threshold MOSFET-Based Sensing Element and CMOS Thyristor-Based VCO. 1102-1113 - Hetong Wang, Debajit Basak, Yang Zhang, Kong-Pang Pun:
A 0.59-mW 78.7-dB SNDR 2-MHz Bandwidth Active-RC Delta-Sigma Modulator With Relaxed and Reduced Amplifiers. 1114-1122 - Antonio Vincenzo Radogna, Simonetta Capone, Luca Francioso, Pietro Aleardo Siciliano, Stefano D'Amico:
A 296 nJ Energy-per-Measurement Relaxation Oscillator-Based Analog Front-End for Chemiresistive Sensors. 1123-1133 - Qing Yang, Hai Li:
BitSystolic: A 26.7 TOPS/W 2b~8b NPU With Configurable Data Flows for Edge Devices. 1134-1145 - Yihong Zhu, Min Zhu, Bohan Yang, Wenping Zhu, Chenchen Deng, Chen Chen, Shaojun Wei, Leibo Liu:
LWRpro: An Energy-Efficient Configurable Crypto-Processor for Module-LWR. 1146-1159 - Zhixuan Wang, Le Ye, Qianqian Huang, Kaixuan Du, Zhichao Tan, Yangyuan Wang, Ru Huang:
Ultra-Low-Power and Performance-Improved Logic Circuit Using Hybrid TFET-MOSFET Standard Cells Topologies and Optimized Digital Front-End Process. 1160-1170 - Shourya Gupta, Benton H. Calhoun:
Dynamic Read VMIN and Yield Estimation for Nanoscale SRAMs. 1171-1182 - Sukkwang Park, Jaekyun Moon:
Characterization of Inter-Cell Interference in 3D NAND Flash Memory. 1183-1192 - Yue Zhang, Jinkai Wang, Chenyu Lian, Yining Bai, Guanda Wang, Zhizhong Zhang, Zhenyi Zheng, Lei Chen, Kun Zhang, Georgios Ch. Sirakoulis, Youguang Zhang:
Time-Domain Computing in Memory Using Spintronics for Energy-Efficient Convolutional Neural Network. 1193-1205 - Piljoo Choi, Mun-Kyu Lee, Dong Kyue Kim:
ECC Coprocessor Over a NIST Prime Field Using Fast Partial Montgomery Reduction. 1206-1216 - Honglan Jiang, Shaahin Angizi, Deliang Fan, Jie Han, Leibo Liu:
Non-Volatile Approximate Arithmetic Circuits Using Scalable Hybrid Spin-CMOS Majority Gates. 1217-1230 - Hui Chen, Heping Yang, Wenqing Song, Zhonghai Lu, Yuxiang Fu, Li Li, Zongguang Yu:
Symmetric-Mapping LUT-Based Method and Architecture for Computing XY-Like Functions. 1231-1244 - Hiroomi Hikawa:
Hardware Self-Organizing Map Based on Digital Frequency-Locked Loop and Triangular Neighborhood Function. 1245-1258