On-Chip Transformer: Overview, Apllications and Modeling

According to the chronological literature survey, there exist three types of the on-chip transformer i.e the traditional on-chip passive transformer, the Distributed active transformer (DAT), and the CMOS gyrator-C active transformer (Yuan 2007). Formerly, there exist many review articles on the on-chip transformer. However, these articles focus on the on-chip passive transformer due to its renowns where as DAT and CMOS gyrator-C are overlooked. Hence, the review on the on-chip transformer with the formerly overlooked DAT and CMOS gyrator-C active transformer also focused has been proposed in this study. The overviews, applications and modelings of all three types of the on-chip transformer have been discussed. Furthermore, an interresting open research issue is also suggested.