Complexities in Digital Circuits:
* Large number of gates
* Number of data paths to check goes up geometrically with
number of gates - challenge for testing, test vector coverage
* Timing
Complexities in Analog Circuits
* Accumulation of uncertainty / error - Simulation vs Actual:
Model -> Simulation Program -> Variation in Parts
* Uncertainty in Meeting Specifications
Scheduling invention / Changing Specs
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