Patent ID: 7071502

Claim:
A charge coupled device of the buried channel type with a semiconductor body comprising: a first layer of a first conductivity type which adjoins a surface of the semiconductor body and which forms a buried channel for storage and transport of electric charge; a second layer of a second conductivity type opposite to the first which lies below and adjoins the first layer; and a third layer of the first conductivity type which lies below and adjoins the second layer and through which excess charge can be drained from the first layer, wherein the surface is provided with a system of electrodes with a series of gate electrodes which are situated above the buried channel and which are connected to a voltage source for the at least temporary application of such a voltage to the gate electrodes that an inversion layer of the second conductivity type is formed adjoining the surface below the gate electrodes, while means are present for obtaining a built-in potential difference in the channel whereby potential wells in which charge can be stored alternating with potential barriers are formed in the channel upon the application of equal voltages to the gate electrodes, while means are present for charge reset through the second layer, said means comprising constrictions in the thickness or the doping concentration of the second layer below the channel that viewed in projection are line-shaped, wherein the line-shaped constrictions in the thickness or the doping concentration of the second layer run perpendicular to the length direction of the channel and parallel to the gate electrodes, and wherein at least one line shaped constriction is positioned below the series of gate electrodes.