Realisation of multithreshold threshold-logic gates using charge-coupled devices

A threshold logic gate is described which uses as its core a charge-coupled device. It is shown that the CCD is suitable for this application because of its ability to (a) quantise charge input to a gate, (b) add charge packets from different gates, and (c) permit conditional charge overflow to occur. The peripheral circuitry employs compatible MOSFET circuits, so that the entire gate can be made in integrated circuit form. The gate is voltage programmbale.