# Utility Functions

A few SKILL functions that make life easier.

### GNTNyquistPlot( wave )

This functions creates a Nyquist plot of wave with both positive and negative frequencies.

### asiCreateCdsenvFile()

Do not use on production machines.

In order to avoid the warning about undefined environment variables related to the gnt analysis, such as:

WARNING (ADE-5033): Cannot find the environment variable 'start' for tool 'spectre.gnt'. Its internal default value will be used.

this built-in function asiCreateCdsenvFile() can be used. Running

asiCreateCdsenvFile('spectre)

creates a file spectreCdsenvFile in the current directory. This file should replace the original one in the Cadence installation tree at: