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A digital approach for automatic tuning of continuous-time high-Q filters

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2 Author(s)
Sumesaglam, T. ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Karsilayan, A.I.

A digital scheme for automatic tuning of continuous-time high-Q filters is proposed. The tuning scheme uses the phase information for both frequency and Q-factor tuning, therefore, the relationship between the filter's passband magnitude and Q is immaterial. Due to the digital control of the tuning loops, only one loop is active at a given time interval, which eliminates the need for a slow Q tuning loop, improves stability and reduces tuning time. Experimental breadboard tests verify the operation where approximately 1% tuning error is accomplished using the offline tuning algorithm.

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:50 ,  Issue: 10 )