A switched capacitor narrow band pass filter includes a first switch including a first pole movable between two first switch terminals, a second switch including a second pole moveable between second switch terminals, and a third switch including additional poles movable between third switch terminals. The filter further includes an effective capacitor coupled to the first pole and a plurality of matchinq capacitors coupled respectively to the second and third switch terminals. The additional poles are coupled to the third switch terminals according to a first predetermined sequence and to the third switch terminals at a predetermined frequency. A differential amplifier assembly includes two positive and 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.