| 摘要 |
PURPOSE:To prevent the lowering of the dynamic range in the BDD, the lowering of the signal level and the like, by making the floating capacitance value in the stage where an output circuit is connected with the side of the hot end of a capacitance smaller than the floating capacitance values of the other stages. CONSTITUTION:Inside of a plurality of N-type regions 33 junction-separated from a P-substrate, an NPN transistor Q and a capacitance C are formed. The transistors in the adjacent regions are connected in a series with an emitter terminal and collector terminal, and base terminals connected to a metal electrode 38 of the capacitance are alternately connected with two-phase clock terminals to constitute a BBD circuit. Among the circuits of the respective stages, the region 33 of the circuit to be furnished with a terminal Y connecting with the output circuit is made smaller than the region 33 (shown in dotted line) of the other stage to cancel the increase of the floating capacitance to be added by the connected ouput circuit. Thereby, the influence of the floating capacitance in the output stage can be removed to stabilize the operation of the electric charge transfer circuit. |
