Patent ID: 7652526

Claim:
A switched capacitor narrow band pass filter comprising electronic switches, wherein a first switch comprises a first pole electrically movable between two first switch terminals, and wherein a second switch comprises a second pole electrically moveable between a plurality of second switch terminals, and wherein a third switch comprises a plurality of additional poles electrically movable between a plurality of third switch terminals, said switched capacitor narrow band pass filter further comprising: an effective capacitor being coupled to the first pole; a filter input line being coupled to receive a filter signal and to the first pole, wherein the first pole is adapted to couple said effective capacitor to the second pole; a plurality of matching capacitors being coupled respectively to the second switch terminals and being coupled respectively to the third switch terminals; the additional poles electrically coupled to the third switch terminals according to a first predetermined sequence and to the third switch terminals at a predetermined frequency; and a differential amplifier assembly having two positive terminals and having two negative terminals coupled to the additional poles in a second predetermined sequence wherein two of the additional poles are coupled to the positive terminals and two others of the additional poles are coupled to the negative terminals for signal summation.