MULTISTAGE VARIABLE CONDUCTANCE CIRCUIT, NEUROCHIP USING THE CIRCUIT, READ/WRITE METHOD FOR THE CHIP, AND SEMICONDUCTOR DEVICE

摘要

PURPOSE:To obtain a multistage variable conductance circuit which has a high reliability and is easy to integrate by connecting a variable conductance element to the connection point between a multidifferential negative resistance element and a load element in a series circuit consisting of them. CONSTITUTION:An FET 2 as the variable conductance element is connected to the connection point between a multidifferential negative resistance element 1 and a load resistance 3. Then, a multistage variable conductance circuit is constituted. That is, a multilevel stabilizing circuit consists of the element 1, and the conductance of the element 2 is controlled stepwise by its output. That is, the state which the conductance of the element 2 can take is limited to several discontinuous values. Thus, the reproducibility and the set precision of the output are improved. Integration is facilitated because the number of elements is smaller.