Using DOE to improve COB bonbability
In recent years, the Chip-on-Board (COB) package technology has become popular in semiconductor industries. The COB technology, in which the dies are directly mounted onto a printed circuit board (PCB) with bonding wires connecting the die and leads. Besides solder bumps, wire bonding is still the most popular interconnect method. With the development of wire bonding technology in the COB package, we can realize advanced processes with good performance by new wire bonding equipment and more powerful software. However, there are still many challenges to be overcome in the bonding process. In this paper, we did experiments to optimize the bonding parameter using 1.0mil Au wire on COB and successfully found the optimal range of bonding parameters through DOE (Design Of Experiment). By the optimal solution, we further improved the bondability; the second bonding quality was also improved by using BSOB (Bond Stitch On Ball) bonding.
Dynamic response of a molded leaded package in wire bonding assembly process
In this paper, a 3-D finite element (FE) model was established to simulate the dynamic vibration in lead frame of molded leaded package (MLP during wire bonding process. The dynamic vibration response in the MLP will be examined. Four lead frame design options are investigated for their dynamic response during the wire bonding process. Two different wire bonding ultrasonic vibration directions are studied. Different wire bonding clamping methods are considered. Different polymer tape materials under lead frame are checked as well. Finally, the ball stitch on ball (BSOB) wire bonding and normal wire bonding process are compared. The FEA modeling results show that all of these factors have impacted on the neighbor leads' vibration response significantly. BSOB wire bonding method is a good method to reduce neighbor lead vibration for all four lead frame design options. This study helps to improve assembly yield in wire bonding process of a lead frame MLP.
Religious Ethics and Active Euthanasia in a Pluralistic Society
This article sets out a descriptive typology of religious perspectives on legalized euthanasia—political advocacy, individual conscience, silence, embedded opposition, and formal public opposition—and then examines the normative basis for these perspectives through the themes of sovereignty, stewardship, and the self. It also explores the public relevance of these religious perspectives for debates over legalized euthanasia, particularly in the realm of public policy. Ironically, the moral discourse of religious traditions on euthanasia may gain public relevance at the expense of its religious content. Nonetheless, religious traditions can provide a context of ultimacy and meaning to this debate, which is a condition for genuine pluralism. A table setting out the views of various denominations with regard to euthanasia is included.