1. A radio frequency (RF) tunable circuit configured to operate over a frequency range of operation of an input RF signal, comprising:one or more tunable elements;
a filter having at least one frequency response slope in a frequency region that covers the frequency range of operation of the tunable circuit, the at least one frequency response slope determined by one or more poles used to realize the filter; and
a level detector coupled to the filter, and configured to detect an amplitude of the input RF signal through the filter,
wherein tuning of the one or more tunable elements is based on a detected amplitude of the input RF signal through the filter, and is configured to provide a tuned frequency dependent performance of an output RF signal of the tunable circuit, and
wherein a number of the one or more poles of the filter is based on a desired frequency resolution of the tuned frequency dependent performance.