SEMICONDUCTOR ARITHMETIC CIRCUIT, AND DTA PROCESSOR

摘要

PROBLEM TO BE SOLVED: To compare the sizes of plural pieces of data at a high speed by using a simple circuit in real time, by specifying a position where maximum voltage exists among signal voltage inputted to an inverter circuit group by the output signal of the inverter circuit group. SOLUTION: Since a vMOS(vertical MOS) cell B221 maintains an inversion state when '1' is inputted to even one of V1 -V4 , VR continuously reduces until the output of the last vMOS cell A218 changes from '1' to '0'. When the output of the vMOS cell A218 becomes '0', the vMOS cell B221 inverts the state and VR starts increasing to '1'. Since VR is decided so that the vMOS cell A218 of maximum input oscillates near a threshold, the oscillation of the circuit is formed to always contain the vMOS cell A218 of maximum input. Thus, the position of largest input voltage can continuously in time be specified.