OrCAD relies on a license manager (often FlexNet). In a standard installation, this runs as a background service. In a portable version, the license management is usually emulated or "cracked" to run locally. This makes the software unstable; it may crash unexpectedly or refuse to simulate complex circuits if the licensing emulation fails.
Evaluates frequency response, crucial for filter and amplifier design. orcad pspice 16.3 portable