Improve chip performance without process advances

Imagine you are designing a digital chip, but the process node and fundamental device technology are already locked in: there is no faster process available and no major circuit-level breakthrough on the horizon.

Your team still wants better performance, whether that means a higher maximum clock frequency or more operations per second.

1. What kinds of changes can you make at the architectural, micro-architectural, and logic levels to improve performance under these constraints?
2. How do these changes typically trade off performance, power, and area (PPA)?
3. Taking a 32-bit adder as an example, compare a basic ripple-carry adder with 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?

Overview: This question tests 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.