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 continuously while it is in the system. No switching is involved. Whereas the more common master-slave approach relies on matching of components, the self-tuning approach does not. Consequently, the self-tuning approach promises more precision. Experimental work includes an implementation in 3 mum CMOS of a filter which operates up to 20 MHz and of a phase-locked loop which performs a self tune of the filter. Simulations and measurements which demonstrate the functionality of the approach are reported.