Issue No.02 - February (1973 vol.22)
D. Hampel , Advanced Communications Laboratory, RCA Corporation
Threshold logic gates, up to now, generally have been presumed to provide a single function of the input variables. The threshold gates that have been integrated -4] were naturally double-sided and provided complementary outputs or, more specifically, complemented dual outputs. This paper shows that the inphase and out-of-phase outputs can, in fact, be designed to provide grossly different functions of the input variables. Two examples of this technique have already been shown  and one of these, the full adder, has been demonstrated in a multiplier . Now this technique is generalized, and furthermore, it is shown how each side can be subdivided to provide a number of functions simultaneously. Finally, virtual oRing of specific output points from each side will result in still more functions. The sum-resistor specification for any order function on either side is given. Practical application of these techniques are discussed, including those basic ones that have already been disclosed.
Emitter coupled logic, high-speed logic, multifuction logic, parity circuits implemented with threshold logic, threshold logic, universal logic, virtual oRing.
D. Hampel, "MultiFunction Threshold Gates", IEEE Transactions on Computers, vol.22, no. 2, pp. 197-203, February 1973, doi:10.1109/T-C.1973.223685