Minimal transfer c.c.d. structures

The letter introduces a new store structure, the double binary tree, which minimises the charge loss due to intercell transfers in charge-coupled-device stores. This structure offers a significant improvement over the series-parallel-series structure (currently in use) in this respect. Modification of a design parameter converts this structure to a shift register at one extreme and a random-access store at the other. Under some design constraints, a topologically efficient configuration is possible, but, with additional constraints, it is shown that the series-parallel-series structure remains optimal.