Title :
Tunable coupled inductor Q-enhancement for parallel resonant LC tanks
Author :
Georgescu, Bogdan ; Pekau, Holly ; Haslett, James ; McRory, John
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Calgary, Canada
Abstract :
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 cancelling 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 μm CMOS and the performance was verified experimentally.
Keywords :
CMOS analogue integrated circuits; Q-factor; active filters; band-pass filters; circuit feedback; circuit resonance; circuit stability; circuit tuning; distortion; inductors; resonator filters; transformers; voltage control; 0.18 micron; CMOS process; DC voltage control; inductors Q-factor; linearity analysis; monolithic IC; monolithic spiral inductors; parallel resonant LC tanks; positive feedback; stability issues; transformer-based Q-enhancement method; tunable coupled inductor Q-enhancement; Active circuits; Active inductors; Filters; Impedance; Inductance; Q factor; Radio frequency; Resonance; Transceivers; Tunable circuits and devices;
Journal_Title :
Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on
DOI :
10.1109/TCSII.2003.818366
