A high Q RF CMOS differential active inductor

This paper presents the design of a differential CMOS active inductor for use in applications around 1-1.7 GHz. The architecture is based on a gyrator-C topology, where tuneable compensation techniques are applied to reduce phase error due to additional device parasitics, thus extending the useable frequency range of the inductor closer to the f/sub t/ of the technology. The inductance value and quality factor are also independently tuneable, and simulation results using device parameters from the AMS 0.8 /spl mu/m CMOS process demonstrate operation at 1.5 GHz with a Q of over 300. The implementation of a tuneable bandpass filter using the inductor is also demonstrated.