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Equation 7 · Part 1 · Chiplets and Advanced Packaging in 2035: Scenarios, Signals, and Falsifiable Predictions

Symbol p^2

1/p21/p^{2}
p2p^{2}

What this part means

the square of p; the pitch.

Its job in the formula

p2p^2 is squared: multiply the underlying quantity by itself. The square is a mathematical operation, not a second independent variable.

Where the article explains it

For interconnects arranged on a roughly square grid at pitch p , the number of connections available per unit of bonding area scales as ρ(p)\rho(p) \;≈\approx\; 1p2\frac{1}{p^{2}}.

The passage around this formula

Because N itself grows as roughly 1/p2p^{2} under the density relation above, YbondY_{\mathrm{bond}} falls unless the per-interconnect defect probability π\pi improves at least as fast as the pitch shrinks — which is precisely the motivation behind Chen and Gupta’s YAP+ framework, a pad-layout-aware yield model for copper-copper hybrid bonding that accounts for misalignment, particle contamination, copper recess variation, surface roughness and pad density across arbitrary layouts, and reports a near-analytical model matching full physical-simulation accuracy at more than a thousand-fold speed-up in runtime [ 11 ] . A fast, accurate yield model of this kind is itself a signal about where the field…

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Learn the underlying idea

An exponent tells how a base is used in multiplication. In x³, x is the base and 3 is the exponent: x³ = x × x × x.

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Sources cited in the surrounding passage

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