| 摘要 |
PURPOSE:To obtain a transversal filter having a reduced effect of variance, by dividing the capacities of plural stages of a charge transfer element according to the sensitivity coefficient to obtain an output proportional to the sensitivity coefficient after separating and connecting them. CONSTITUTION:The signals of k times as much as the sensitivity coefficients a2 and a8 are extracted from the capacitors C'2 and C'8, respectively. These signals are attenuated down to 1/k by a current Miller circuit M2 and then mixed with the signals sent from a current Miller circuit M1 to be transferred to a BBD. In this case, the dividing ratio of a capacitor which extracts the signals is all set approximately at 0.5 to reduce an effect of variance. Thus the accuracy of the filter characteristics can be increased. |
