A nonlinear CCD lumped model and its application to output stage performance analysis

Charge transfer phenomena in CCD (charge-coupled devices) are analyzed using the newly proposed nonlinear lumped model. In this model, carriers are lumped to the center of the potential well and assumed to be transferred unidirectionally from the lump to the adjacent deep Well. The simple equivalent circuit with a nonlinear driftance, which is defined in this paper, is obtained for one stage transfer. Transfer characteristics are in good agreement with results of numerical analysis. Experimentally observed waveforms of CCD output stage could be explained with this nonlinear lumped model.