Title :
Q locked loop to tune a high-Q high-frequency bandpass filter
Author :
Kumar, Ajay ; Allen, Phillip E.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA
Abstract :
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
Keywords :
CMOS integrated circuits; Q-factor; VHF filters; band-pass filters; circuit tuning; continuous time filters; phase locked loops; transfer functions; voltage-controlled oscillators; 0.25 micron; 70 MHz; CMOS process; continuous-time filter; filter phase characteristics; high-Q bandpass filter; loop stability; phase locked loop system; quality factor tuning scheme; voltage controlled oscillator; Band pass filters; Envelope detectors; Frequency conversion; Phase detection; Phase locked loops; Q factor; Student members; Surface acoustic waves; Tuning; Voltage-controlled oscillators; Q tuning; continuous-time filter; high-Q bandpass filter;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1693362
