Digital tuning of continuous-time high-Q filters
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A digital tuning 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 filter's passband magnitude and Q is immaterial. Due to the digital control of tuning loops, only one loop is active at a given time interval, which eliminates the need for low Q tuning loop, improves stability and reduces tuning time. Experimental tests on the breadboard verify the operation where approximately 1% tuning error is accomplished.
