Foss tools usage for circuit simulation in analog IC design

Circuit simulation is an important part of the microelectronics design flow. This paper presents a design flow using Qucs-S circuit simulation tool with Ngspice or QucsatorRF backend. This solution may be targeted to both academic and industrial applications. Qucs-S combines a modern graphical user interface and a computation power of open-source circuit simulation kernels like Ngspice, QucsatorRF, and XYCE. The article provides an overview of Qucs-S software architecture and its application for integrated circuits design. The proposed workflow is illustrated by example of the semiconductor resistors parameter extraction and corner analysis using the mentioned open-source tools.