CMOS VLSI devices are becoming higher in speed and density. These advanced CMOS devices have powerful output buffers to charge a load capacitance quickly. which causes large switching noise on the power/ground lines. Furthermore, the equivalent impedance of the output buffer becomes lower than the characteristic impedance of the transmission line on a board, which induces complicated phenomena including ringing noise. This paper mainly describes the electrical characteristics of a 348 pin QFP (Quad flat package) developed for a 1 micron, 129K gate CMOS gate array. First. the factors which determine switching noise were investigated by a simulation model which represents the packaging environment. Next, a test chip for evaluating the swiching noise was designed and used to characterize the developed 348 pin QFP.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.