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

Volume

50

Issue

10

fYear

2003

Firstpage

705

Lastpage

713

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;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/TCSII.2003.818366

Filename

1237358