A predictive model for Slow-wave Coplanar Striplines in integrated technologies

This paper presents a predictive model for Slow-wave Coplanar Striplines (S-CPS). A Quasi-TEM propagation mode has been assumed for developing the equivalent electrical model. Based on the geometries and definition of the back end of line, the model is capable of fully predict the behavior of the SCPS without any fitting parameters. The model was validated with measurements of S-CPS implemented in the 0.35-μm CMOS AMS technology. A good agreement is achieved between the model and measurements in a wide band (DC-40GHz). This model provides the designer a powerful tool for fast design of differential circuits, for which the use of S-CPS instead of microstrip lines can be very efficient.