Equation 1 · Part 2 · Advanced Semiconductor Fabrication in Practice: Design Rules, Foundry PDKs, and the Yield Ramp
Symbol e^-AF
What this part means
AF is one of the signed contributions combined to compute the quantity on the left.
Its job in the formula
AF is one of the signed contributions combined to compute the quantity on the left.
Full expression→Symbol e^-AF→Article meaning
The passage around this formula
The study’s production model uses a standard form for die-sort yield as a function of electrical fault density, treating faults as randomly and independently distributed across a wafer: . where A is the critical area of the circuit — the area of the design actually susceptible to a given class of fault — and F is the fault density measured per unit area [ 7 ] . The relationship is exponential in both variables, which is precisely why yield learning is disproportionately valuable: a fixed absolute reduction in fault density buys a much larger yield improvement once fault density is already low than the same absolute reduction bought when fault density was high.
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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