PURPOSE: To change the gain of a filter itself by changing over a switch so as to change the value of the charger transfer capacity.
CONSTITUTION: Series circuits of a capacitor C0 and a capacitor selecting switch S0, capacitors C1, C2 and capacitor selecting switches S1, S2 are connected in parallel. A connecting point of the capacitors C0∼C2 is connected to terminals A, B via a switch SW switched in the period of a block frequency to one of a couple of input and output terminals. Further, the connecting point of the capacitor changeover switches S0∼S2 is connected to the other terminals of a couple of input and output terminals. The value of the charge transfer capacitance used for the transfer of charge is changed between the input and output terminals in the switched capacitor by turning on any of the capacitor changeover switches S0∼S2 with a changeover signal from a switching control circuit (not shown in the figure).
HAGISHIMA KOUICHI
ISHIZAWA AKIRA
| JPS55115713A | 1980-09-05 |