CMOS Gyrator-C Active Transformers

This paper presents a systematic approach to synthesize gyrator-C active transformers using MOS transistors. The self and mutual inductances of ideal and non-ideal active transformers are investigated in detailed and the intrinsic relation between the self and mutual inductances is derived. The configurations of gyrator-C active transformers with multiple primary and secondary windings are developed. Practical implementations of the proposed gyrator-C active transformers are realized in TSMC´s 1.8V 0.18mum CMOS technology and their characteristics are analyzed using Spectre from Cadence design systems with BSIM3.3 device models. Simulation results are presented.