Output circuit for providing a finally adjustable voltage

Abstract

A constant voltage generator circuit comprises adjusting means for making fine adjustment of each back-gate voltage of transistors on the basis of external control signals, and a transistor circuit for outputting a constant voltage adjusted on the basis of the back-gate voltage. A constant voltage generator circuit comprises adjusting means for making fine adjustment of each back-gate voltage of transistors on the basis of external control signals; and a transistor circuit for outputting a constant voltage adjusted on the basis of the back-gate voltages, the transistor circuit including a plurality of N transistors with their respective gates and sources connected together, and a load element for dividing the power source voltage with a plurality of N transistors. Adjusting means comprises a plurality of N-1 switching circuits for supplying bias voltages individually to the back-gate of the first through (N-1)th transistors in the transistor circuit on the basis of the external control signal, and a switching element for stopping the operation of the Nth transistor in the transistor circuit on the basis of the external control signal. A semiconductor memory comprises memory means for storing information; and constant voltage generating means for supplying voltage to memory means, the constant voltage generating means including adjusting means for making fine adjustment of each back-gate voltage of a plurality of transistor on the basis of external control signals, and a transistor circuit for outputting the constant voltage adjusted on the basis of the back-gate voltages.