Equation 4 · Part 1 · Comparing the Main Approaches to Chiplets and Advanced Packaging
Symbol f_b
What this part means
the data rate carried by a single connection.
Its job in the formula
is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol f_b→Article meaning
Where the article explains it
where is the data rate carried by a single connection.
The passage around this formula
where is the data rate carried by a single connection. The relationship is quadratic in pitch, not linear: halving the pitch alone — with no change to the per-connection data rate — quadruples the number of connections available in the same area, and therefore roughly quadruples aggregate bandwidth density. That is why the packaging industry has spent so much engineering effort on pitch specifically, rather than on pushing more current or a faster signal through the connections that already exist: geometry, not signalling rate, is the cheapest source of additional bandwidth once a joint is already short and direct.
Learn the underlying idea
A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
Open the illustrated subscripts: which member of a family? guide →
See this notation across published equations →
Sources cited in the article section
- [6] Chiplets: Piecing Together the Next Generation of Chips (Part I) ↗
- [11] Architecture, Dataflow and Physical Design Implications of 3D-ICs for DNN-Accelerators ↗
These citations provide research context; check each source for the exact claim it supports.