Presented is the complete demonstration of an assembled system using AC coupled interconnect (ACCI) and buried solder bumps. In this system, noncontacting input/output (I/O) are created by using half-capacitor plates on both a chip and a substrate, while buried solder bumps are used to provide power/ground distribution and physical alignment of the coupling plates. ACCI using buried bumps is a technology that provides a manufacturable solution for noncontacting I/O signaling by integrating high-density, low inductance power/ground distribution with high-density, high-speed I/O. The demonstration system shows two channels operating simultaneously at 2.5 Gb/s/channel with a bit error rate less than 10 12 , across 5.6 cm of transmission line on a multichip module (MCM). Simple transceiver circuits were designed and fabricated in a 0.35-m complementary metal-oxide-semiconductor (CMOS) technology, and for PRBS-127 data at 2.5 Gb/s transmit and receive circuits consumed 10.3 mW and 15.0 mW, respectively. This work illustrates the increasing importance of chip and package co-design for high-performance systems.Index Terms-AC coupled interconnect (ACCI), buried bumps, capacitive coupling, MCM, pulse signaling, noncontacting I/O, chip and package co-design.
Mastery of core chemistry content is a degree requirement for several STEM majors. Gatekeeper courses, like general and physical chemistry, have a history of weeding out struggling students, and often underrepresented groups underperform. While gatekeeper courses ensure students are prepared for STEM degrees, it is essential they do not create undue obstacles or dampen interest in STEM. This article describes the implementation and evaluation of efforts to infuse polymer science into a two-semester sequence of general and physical chemistry courses. Survey and focus group data revealed positive feedback from students. Also, improved student mastery of polymer concepts and knowledge was demonstrated in preand postassessments. Ultimately, these initial efforts provided students with additional foundational skills and increased engagement with chemistry content.
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