Open Access Original Research Article

Interconnect Technique for Tight Clearance in Stacked-die Package

F. R. Gomez, R. Rodriguez, N. Gomez

Journal of Engineering Research and Reports, Page 1-5
DOI: 10.9734/jerr/2020/v11i217054

The paper focused in addressing wire-related assembly issues due to tight clearances in the semiconductor package design. Package design characterization was done considering the assembly design rules and the advanced rules, resulting to the integration of an interposer in the package design.  With the new design, the assembly limitations and capability could be improved specifically for semiconductor devices with tight clearance requirement. Furthermore, gross assembly rejections related to tight clearances could be mitigated with the design solution and process improvement.

Open Access Original Research Article

A Path to Renewable Energy from the Energy Crisis in Bangladesh

Zafrin Ahmed Liza, Hajera Akhter, Md. Shahibuzzaman, Mohammad Rakibul Islam

Journal of Engineering Research and Reports, Page 6-19
DOI: 10.9734/jerr/2020/v11i217055

Bangladesh is facing a tremendous energy crisis and the economic development of this country was jeopardized due to the lack of energy resources. Due to the progression of technology, the consumption of power is rising gradually. Adequate and consistent source of electricity is a key requirement for a constant and successful economic development. Due to the heavy dependence on natural gas and the possibility of this energy source to be exhausted in near future, an alternate way to find an energy source leads us in a path to renewable energy. In this paper, the current energy scenario is analyzed while the sources to renewable energy are explored. These renewable sources are briefly explained while the status and possibility of these resources in Bangladesh are investigated. Finally the social impacts of these renewable energy sources are scrutinized.

Open Access Original Research Article

Implementation of Pads Re-layout for QFN Multi-row Breakthrough

R. Rodriguez, F. R. Gomez, M. G. Maming

Journal of Engineering Research and Reports, Page 20-24
DOI: 10.9734/jerr/2020/v11i217056

An alternative design of Quad-Flat No-lead (QFN) leadframe capable with three or more arrays of lead is discussed and presented on this paper. The leadframe design is integrated with connecting bars that can be routed and bonded with wires to decrease the wire span and create a more manufacturable wirebonding structure in densified design of QFN. In addition, the connecting bars produced an inter-connection link between relocated pads and extended input/output (I/O) leads for the 3rd array electrical connections. The implementation of the proposed augmented design would improve the manufacturability of multiple arrays of I/O in QFN, enabling cost-saving initiative and manufacturing solution to devices with multiple arrays requirement.

Open Access Original Research Article

Analysis of the Gaseous Emissions and the Residues Generated under Oxy-fuel Combustion of Biomasses in a Drop Tube Furnace (DTF)

Glauber Cruz, Paula Manoel Crnkovic

Journal of Engineering Research and Reports, Page 25-40
DOI: 10.9734/jerr/2020/v11i217058

Some environmental problems are caused by pollutants from thermoelectric plants, mainly by burning fossil fuels. Alternatives for reducing such emissions are discussed worldwide and using green fuels is a promising way. Five biomasses (pine sawdust, sugarcane bagasse, coffee and rice husks and tucumã seeds) were evaluated for application as feedstock in thermochemical processes. Particular attention is devoted to the residues and emissions (CO, CO2, SO2 and NO) produced by biomasses burning in a Drop Tube Furnace (DTF). Oxy-combustion (CO2/O2:60/40%) experiments were performed and emissions monitored continuously. Thermal analysis, scanning electron microscopy, and energy dispersive spectroscopy were used to characterize in natura biomasses and residues after oxy-fuel combustion. CO2 emissions ranged between 34 and 60 mg Nm-3 g-1. Sugarcane bagasse showed the lowest emissions of CO2 and NO (34 and 21 mg Nm-3            g-1, respectively) and highest O2-consumption (≈ 32%), while tucumã seed and pine sawdust samples provided the lowest values of CO and SO2 (345 and 5 mg Nm-3 g-1, respectively). TG/DTG curves of the residues compared to the in natura samples aided in diagnosing the performance of the oxy-combustion in a DTF. Organic matter remaining in residues (from 3 to 92%) showed clearly that efficiency of the thermal process varies with biomass-type used. Chemical composition of the residues showed different proportions of inorganic elements (Si, K and Ca) and trace elements (Na, Fe, Cu, S, P, Ma and Cl), demonstrating that individual behavior is an effect of the biomass properties diversity, influencing directly the burning process. The knowledge of some trends is important for the understanding that generalizations of processes cannot be applied when different biomasses are used in thermal processes.

Open Access Original Research Article

Package Design Improvement for Wire Shorting Resolution

A. Sumagpang Jr., E. Graycochea Jr., F. R. Gomez

Journal of Engineering Research and Reports, Page 41-44
DOI: 10.9734/jerr/2020/v11i217059

New devices and new technologies in semiconductor industry are getting more complex in terms  of package layout, direct materials, and process capability. With the package design complexity, several issues are encountered during the development, and in turn affecting the overall yield of the package. The paper discusses the modification and improvement done on the bond/lead finger where the wire has issues on shorting with the soldermask during wirebonding process. With the design improvement, occurrence of wire shorting to soldermask would be mitigated.