
Accession Number : AD0660961
Title : THE ANALYSIS AND SYNTHESIS OF CONTACTLESS MULTISTROKE CIRCUITS,
Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHTPATTERSON AFB OHIO
Personal Author(s) : CoroiNedelcu,M.
Report Date : 16 JUN 1967
Pagination or Media Count : 19
Abstract : An algebraic method for the solution of problems of contactless switching circuits is given. The same problem was solved (Gr. C. Moisil. Teoria algebrica a mecanismelor automate. Bucuresti, Editura Tecnica, 1959) for the case of relaycontact switching circuits, by the use of trinary logic. In the problem of indeterminate switching states, due to the small but noticeable effect of time lags in contactless switching (e. g. solid state devices), the exact sequence of switch closures cannot be precisely predetermined, leading to an indeterminate condition known as 'competition'. This condition arises when, in going from state i to state j, two or more variables may be required to change simultaneously, and since the final state is a function of the order in which the switching took place, one may have two or more elements competing for the same time interval in which to switch. To avoid this problem, artificial delays in the form of delay lines are introduced in the circuit so as to prevent two switches closing simultaneously. If it is not physically possible to eliminate this indeterminacy in a given circuit, it is necessary to use suitable transformations to generate a physically different but algebraically equivalent circuit, which must not contain the 'drop set' or 'lift set' networks. A system of recurrent relationships of the type is obtained.
Descriptors : (*LOGIC CIRCUITS, *SWITCHING CIRCUITS), MATHEMATICAL LOGIC, SYNTHESIS, ALGEBRA, PROBLEM SOLVING, USSR
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE