The LM117 is a positive linear voltage regulator. It can be programmed to produce a fixed output voltage using two resistors. This regulator is used as a case study to understand how:

Risk Assessment of LM117- SPICE
LM117 National Datasheet
A SPICE Macromodel for an Adjustable Positive Voltage Regulator
Worst Case Circuit Analysis - An Overview
Total Dose Effects on Negative Voltage Regulator
A Comparison of Tolerance Analysis Methods
A Comparison of Tolerance Analysis Methods Spreadsheet
Risk Assessment of LM117 by AGBell
Spreadsheet to show PSPICE problem
Spice uncovers regulator-stability problems

last updated 17 Jan 2008