JPS645116A - Minimum value arithmetic unit and its control - Google Patents

Abstract

PURPOSE:To attain broad dynamic range, low power consumption and direct interface by using an electric charge in place of a current so as to apply minimum value arithmetic processing. CONSTITUTION:This is the system to control a minimum arithmetic unit obtaining a minimum value of two input signals X, Y for the fuggy logic operation. During the charge injection period, the input signal X is applied to the 1st electrode 13, 0V is fed to the 2nd electrode 14 to make the potential of a barrier potential generating means beneath the electrode lower thereby storing an electric charge to a charge storage means just beneath the 1st electrode 13. Then for the charge transfer period, an input signal Y is applied to the 2nd electrode 14 to transfer the electric charge corresponding to the minimum value of the signals X, Y under the control electrodes 15-18. Thus, the dynamic range is not controlled by a current mirror circuit but made wide and since the voltage signal corresponds one to one to the electric charge, no interface circuit is required in excess and the signal is converted simply and power consumption is less because of the arithmetic operation of electric charges.