Charge-coupled digital circuits

This paper describes the operation and the applications of charge- coupled shift registers for digital signals. Simple signal-regeneration stages for digital charge-coupled shift registers are analyzed and their operation is demonstrated by charge-coupled circuits made by a p-MOS process. A charge-transfer efficiency of about 99.6 percent per electrode at a clock frequency of 1 MHz was obtained in the operation of three-phase 8-bit shift registers made by the p-MOS process. Silicon-gate construction is proposed for achieving high- performance high-density structures and also two-phase charge-coupled devices.