SELF-TUNED CONTINUOUS-TIME NOTCH FILTERS

This paper describes self-tuned continuous-time filters. A self-tuned filter in the context of this paper, is one which is being tuned conti nuously while it is in the system. No switching is involved. Whereas t he more common master-slave approach relies on matching of components, the self-tuning approach does not. Consequently, the self-tuning appr oach promises more precision. Experimental work includes an implementa tion in 3 mum CMOS of a filter which operates up to 20 MHz and of a ph ase-locked loop which performs a self tune of the filter. Simulations and measurements which demonstrate the functionality of the approach a re reported.