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Improve chip performance without process advances

AppleSoftware Engineer · Technical Screen
MediumSoftware EngineerTechnical ScreenSoftware Engineering Fundamentals

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This question evaluates understanding of digital architecture, microarchitecture, and logic‑level techniques for improving chip performance without process advances, along with competence in performance/power/area (PPA) trade‑off analysis and arithmetic block design.

Assume you are working on a digital chip, but the semiconductor process node and basic device technology are fixed: there is no new, faster process and no major circuit-level innovation available.

Your team still wants higher performance (higher maximum clock frequency or more operations per second).

  1. What kinds of changes can you make at the architecture, micro-architecture, and logic levels to improve performance under these constraints?
  2. How do these changes typically trade off performance, power, and area (PPA)?
  3. Using a 32-bit adder as an example, compare a simple ripple-carry adder to a faster mux-select (e.g., carry-select) adder:
  • How do their delays scale with bit-width?
  • How do their areas differ?
  • In what scenarios would you choose each design?