Integrated tunable filter architecture

摘要

An apparatus and method for a frequency based integrated circuit that selectively filters out unwanted bands or regions of interfering frequencies utilizing one or more tunable notch or bandpass filters or tunable low or high pass filters capable of operating across multiple frequencies and multiple bands in noisy RF environments. The tunable filters are fabricated within the same integrated circuit package as the associated frequency based circuitry, thus minimizing R, L, and C parasitic values, and also allowing residual and other parasitic impedance in the associated circuitry and IC package to be absorbed and compensated.

主权项

1. An integrated circuit package for selectively filtering unwanted frequencies from a signal path of a frequency based circuit, including:
(a) a frequency based circuit having a signal path; (b) one or more digitally tunable filters coupled to the signal path of the frequency based circuit, wherein at least one digitally tunable filter includes corresponding direct control lines and is configured to be selectively activated to filter unwanted frequencies from the signal path of the frequency based integrated circuit, wherein the frequency based circuit and such at least one digitally tunable filter are co-designed so as to absorb and compensate for residual and other parasitic impedances present in the integrated circuit, and wherein the direct control lines corresponding to each such digitally tunable filter are configured to receive a digital control word that sets the digitally tunable filter to a selected one of a plurality of states; and (c) a lookup table, coupled to at least one digitally tunable filter, for arbitrarily mapping an initial digital control word to the digital control word.