Patent ID: 6611164
Filing Date: 2003-08-26
Classification: G06G

Abstract:
A weighted mean calculation circuit for calculating a normalized weighted mean value &Sgr; (Vk*Ck)/&Sgr; Ck (k=1, . . . , n) weighted by Ck (k=1, . . . , n) on the basis of a plurality of input voltage signals Vk (k=1, . . . , n), said weighted calculation circuit having a plurality of input terminals for receiving a plurality of input voltage signals, and an output terminal for providing the normalized weighted mean value, said circuit comprising:an inverting amplifier, said inverting amplifier having an input terminal and an output terminal; a plurality of capacitors, each of said plurality of capacitors having a first terminal and a second terminal, each of said first terminals of said plurality of capacitors connected to the input terminal of said inverting amplifier; the capacitive value of each of said plurality of capacitors selected to provide a weighting coefficient associated with each capacitor; a feedback switch connected between the input and the output terminals of said inverting amplifier, said feedback switch having an open position and a closed position; and a plurality of switches, one of said plurality of switches associated with each of said plurality of capacitors, said plurality of switches having first and second switch positions, said plurality of switches coupling the second terminals of said plurality of capacitors to said input voltage signals when said plurality of switches is in the first switch position, and said plurality of switches coupling said plurality of capacitors to the output of said inverting amplifier when said plurality of switches is in the second switch position.