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Q locked loop to tune a high-Q high-frequency bandpass filter

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2 Author(s)
A. Kumar ; Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA ; P. E. Allen

A novel quality factor tuning scheme to tune a high-Q, high-frequency GmC bandpass filter is presented. The proposed Q tuning loop tunes the filter phase characteristics inside a phase locked loop system to tune its quality factor. Filter is used as a voltage controlled oscillator of the phase locked loop system. The proposed tuning scheme starts the 70MHz filter from a low-Q region (~ 10) and tunes its quality factor to ~50. The mathematical analysis and the loop stability of the proposed scheme is presented and analyzed. The proposed Q locked loop is simulated in 0.25mum CMOS process and simulation results are presented

Published in:

2006 IEEE International Symposium on Circuits and Systems

Date of Conference:

21-24 May 2006