Threshold logic: From vacuum tubes to nanoelectronics; Invited Paper

This paper reviews silicon implementations of threshold logic gates, covering several decades. It details numerous VLSI implementations including: capacitive (switched capacitor and floating gate with their variations), conductance/current (pseudo-nMOS, output-wired-inverters, and a plethora of solutions evolved from them), as well as many differential solutions. Nanoelectronic implementations (e.g., based on negative resistance devices and on single electron technologies) are shortly mentioned