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Equation 3 · Part 2 · Comparing the Main Approaches to Chiplets and Advanced Packaging

Symbol f_b

BA  ≈  fbp2,B_A \;\approx\; \frac{f_b}{p^{2}},
fbf_b

What this part means

the data rate carried by a single connection.

Its job in the formula

fbf_b occurs above the fraction bar. The numerator is divided by the entire denominator below it.

Where the article explains it

where fbf_b is the data rate carried by a single connection.

The passage around this formula

…a given joint area can carry. Treating the joint as a grid of independent connections at pitch p , each connection occupying roughly p2p^2 of area, gives a first-order areal bandwidth density BA  ≈  fbp2B_A \;\approx\; \frac{f_b}{p^{2}}. where fbf_b 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…

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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.

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Sources cited in the article section

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