Cadence Design Systems and OrCAD
Cadence PSpice A/D and Advanced Analysis - Spice-based simulator for system design. It simulates complex mixed-signal designs containing both analog and digital parts, and it supports a wide range of simulation models such as IGBTs, pulse width modulators, DACs, and ADCs.

Cadence OrCAD Capture and Capture CIS
Schematic design solution, supporting both flat and hierarchal designs from the simplest to the most complex. Seamless bi-directional integration with OrCAD PCB Editor enables data synchronization and cross-probing/placing between the schematic and the board design.
Cadence Tutorial for VLSI Design
This site contains a complete on-line tutorial for a typical bottom-up design flow using CADENCE Custom IC Design Tools (version 97A). The examples were generated using the HP 0.6 um CMOS14TB process technology files, prepared at North Carolina State University (NCSU) and made available through MOSIS.