Cell Characterization using HSpice

Introduction

Simple Simulations

Inputs

• Ensure that only one input changes at a time.

  Gray code?

• Ensure that all outputs settle before another input is allowed to change.

• If there is an asynchronous reset input, ensure that it is initially assserted. The first input transition should deassert this reset.

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• Unloaded

• Capacitance Loaded

• Standard Loads

Measurements

• Rise and fall times

• Propagation Delays

• Post Simulation Measurements (Awaves)

• Built-in Measurements (.MEASURE)

• Interpretation