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Tunable Coupled Inductor Q-Enhancement for Parallel Resonant LC Tanks

B. Georgescu, H. Pekau, J. Haslett, J. McRory
IEEE Transactions on Circuits and Systems - II: Analog and Digital Signal Processing, Vol. 50, No. 10, pp. 705-713, October 2003

A tunable transformer-based Q-enhancement method for monolithic inductors used in parallel resonant LC tanks is presented. The Q of the inductor that forms the transformer primary is enhanced by canceling the voltage drop across the series loss resistance of the primary with a voltage of opposite polarity that is induced by a current in the secondary. The circuit allows dc voltage control of Q-enhancement. Techniques to address stability issues associated with the positive feedback are described. The circuit was fabricated in 0.18-um CMOS and the performance was verified experimentally.

CONTACTS: Bogdan Georgescu, Holly Pekau, Jim Haslett, John McRory
SUBJECTS: RF Circuits and Systems
TYPE: Journal Publication
PUBLISHED: 2003

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