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Virtual Packages Improve Signal Integrity


The 112 Gb/s generation of SerDes has brought along excessive loss within the package, around 5 dBs of loss within each monolithic package. This loss markedly reduces the usefulness of these SerDes. MCM technology has progressed to where the use of 70mm packages is routine. Non-interposer MCMs easily can use 20 or more chiplets, plus large dies and passives can be used. These MCMs have low ... » read more

SerDes For Chiplets


The XSR 56G and 112G Interoperability Agreements (IAs) announced by the OIF are intended to cover a channel consisting of a pair of up to 50mm. The primary defined application of the XSR SerDes is connecting a chip to a “nearby” optical engine. Because the requirements on these channels are much less stringent than they are on long reach channels, XSR SerDes are expected to have lower power... » read more

How Much Data Can Be Pushed Through Copper Wires?


As the amount of digital data grows, so do requirements on the speed of the transmission at all levels of the transmission chain—between dies in a shared package, between packaged chips inside a device, and between devices. The communication channels encountered at every stage of this communication are different in nature. Those between dies in a shared package, or between packaged chips in a... » read more