Example of CMOS analog cells´ automatic layouts: a cascode current source

The authors present CLAP, a program for automatic layout generation of a cascode current source. The source is considered as a parameterized macrocell whose parameters are either the dimensions of the transistors or the values of the expected currents and voltages. The layout may be drawn by assembling the transistors using analog techniques like abutment or by employing a specific compact configuration called `imbricated S´. A description of the software and some layouts obtained are given