Temporal and frequency characteristic analysis of margin-related failures caused by an intermittent nano-scale fracture of the solder ball in a BGA package device

2017 ◽  
Vol 69 ◽  
pp. 88-99 ◽  
Author(s):  
Hosung Lee ◽  
Sanghyeon Baeg ◽  
Nelson Hua ◽  
ShiJie Wen
Keyword(s):  
Frequency Characteristic ◽  
Solder Ball ◽  
Characteristic Analysis ◽  
Nano Scale ◽  
Bga Package

Hardware Trojan Detection Technique Using Frequency Characteristic Analysis of Path Delay in Application Specific Integrated Circuits

2020 ◽  
Vol 10 (2) ◽  
pp. 36-43
Author(s):  
Ha Thai Tran ◽  
Phuc Van Hoang ◽  
Tuan Ngoc Do ◽  
Duong Hai Nguyen
Keyword(s):  
Integrated Circuits ◽  
Frequency Characteristic ◽  
Integrated Circuit ◽  
Hardware Security ◽  
Hardware Trojan ◽  
Path Delay ◽  
Characteristic Analysis ◽  
Hardware Trojan Detection ◽  
Ic Manufacturing ◽  
Application Specific

 Abstract—  Since the last decade, hardware Trojan (HT) have become a serious problem for hardware security because of outsourcing trends in Integrated Circuit (IC) manufacturing. As the fabrication of IC is becoming very complex and costly, more and more chipmakers outsource their designs or parts of the fabrication process. This trend opens a loophole in hardware security, as an untrusted company could perform malicious modifications to the golden circuit at design or fabrication stages. Therefore, assessing risks and proposing solutions to detect HT are very important tasks. This paper presents a technique for detecting HT using frequency characteristic analysis of path delay. The results show that measuring with the frequency step of 0.016 MHz can detect a HT having the size of 0.2% of the original design.Tóm tắt— Từ thập niên 2010, Trojan phần cứng (HT) đã trở thành một vấn đề nghiêm trọng đối với bảo mật phần cứng, do xu hướng thuê sản xuất mạch tích hợp (Integrated Circuit - IC). Khi quá trình chế tạo IC trở nên phức tạp và tốn kém, ngày càng nhiều nhà sản xuất chip lựa chọn phương án thuê lại một phần hoặc toàn bộ thiết kế IC. Xu hướng này tạo ra lỗ hổng trong bảo mật phần cứng, vì một công ty không đáng tin cậy có thể thực hiện các sửa đổi độc hại vào trong mạch nguyên bản ở giai đoạn thiết kế hoặc chế tạo. Do đó, đánh giá rủi ro và đề xuất giải pháp phát hiện HT là một trong những nhiệm vụ hết sức quan trọng. Bài báo này trình bày một giải pháp phát hiện HT sử dụng phân tích đặc tính tần số của độ trễ đường truyền tín hiệu. Kết quả cho thấy, thực hiện khảo sát với bước tần số 0,016 MHz có thể phát hiện được HT có kích thước 0,2% so với thiết kế ban đầu. 

Location of Partial Discharge Source Model Based on Transformer Single-Winding

2014 ◽  
Vol 628 ◽  
pp. 171-176
Author(s):  
Xiao Hui Song ◽  
Xia Feng ◽  
Zhi Zhong Guo ◽  
Jun Feng Di
Keyword(s):  
Frequency Characteristic ◽  
Partial Discharge ◽  
Source Model ◽  
New Method ◽  
Characteristic Analysis ◽  
Software Simulation ◽  
Discharge Source ◽  
Transformer Winding ◽  
Mean And Variance ◽  
Calculation Analysis

This paper presents a new method to locate partial discharge source of transformer single-winding with the transformer single-winding model and Matlab software simulation. This transformer single-winding model is composed of 300m long wire, which is equivalent to the parameter model composed of only capacitors and inductors through the frequency characteristic analysis of transformer winding. In the process of simulation, the bushing and neutral point current of transformer winding are measured when partial discharge occurs in different position. Then we can get position factor related to the current mean and variance measured through calculation, analysis and deduction. Accordingly the position of partial discharge can be found by corresponding relation. This simulation indicates that this method is effective and practical.

scholarly journals Dynamic Modeling and Frequency Characteristic Analysis of a Novel 3-PSS Flexible Parallel Micro-Manipulator

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 678
Author(s):  
Jun Ren ◽  
Qiuyu Cao
Keyword(s):  
Finite Element ◽  
Dynamic Model ◽  
Dynamic Modeling ◽  
Frequency Characteristic ◽  
Natural Frequencies ◽  
Mobile Platform ◽  
Characteristic Analysis ◽  
Working Space ◽  
Micro Manipulator ◽  
Spherical Hinge

Dynamic modeling and frequency characteristic analysis of a novel 3-PSS (three-prismatic-spherical-spherical) flexible parallel micro-manipulator with three translational DOF in space were investigated in this paper. Firstly, the kinematics analysis was developed based on the pseudo-rigid body model. The Jacobian matrix and the relationship between the micro angular deformation of the flexible spherical hinge and the end pose of mobile platform were respectively obtained by employing vector closed-loop method and coordinate transformation method. Then, taking into account the elastic strain energy of the flexible spherical hinge, dynamic model of this mechanism was established via Lagrange equations, and the expression of natural frequency was further derived. Combined with a set of given parameters, natural frequencies of the system were calculated by using MATLAB software. For the comparison purpose, a simulated modal analysis of the mechanism with the same parameters was also performed by employing finite element ANSYS software. Results from numerical calculation and finite element simulation indicated that maximum error of their natural frequencies was 2.71%, which verified the correctness of the theoretical dynamic model. Finally, variations of natural frequencies with changes of the basic parameters were analyzed. Analysis results show that natural frequencies increase with the increase of the bending stiffness kbm of flexible spherical hinge and the difference in radius Er between static platform and mobile platform, while decrease with the increase of the length l of the link rod and the masses of the main components of mechanism. Besides, it can be further drawn from these obtained results that the natural frequencies increase with the increase of the angle θl between the link rod and the z axis of reference coordinate system. Considering that the increase of the stiffness kbm and the angle θl will reduce the scope of working space, it is recommended in designing the structure to choose a set of larger stiffness kbm and angle θl as much as possible under the premise of satisfying the working space.

Sign in / Sign up

Export Citation Format

Share Document