Patent ID: 7944282
Filing Date: 2011-05-17
Classification: G11C,H02M

Abstract:
1. A voltage generation circuit comprising: a standard voltage generation circuit that generates a reference voltage; a minimum voltage setting circuit that sets a minimum voltage; a voltage setting circuit that gradually sets voltage by switching a plurality of gate transistors to switch a combination of a plurality of resistive elements; a differential amplifier that has two input terminals and one output node, one input terminal is connected to the reference voltage that is generated by the standard voltage generation circuit, another input terminal is connected to the minimum voltage setting circuit and the voltage setting circuit that has the plurality of resistive elements and the plurality of gate transistors connected to the plurality of the resistive elements, and the output node shows the result of the difference voltage of these two inputs; a pump control circuit that outputs a control signal controlling a charge-pump motion, based on the differential voltage; a charge pump circuit that sets up and outputs the voltage by the control signal; a redundancy circuit having a gate transistor and a resistive element that replace a part of resistive elements out of the plurality of the resistive elements inside the voltage setting circuit; a replacement data memory which stores replacement data of a resistive element of a resistance value which deviates from an expected value among each resistance value of the plurality of the resistive elements which are measured by switching the plurality of the gate transistors of the voltage setting circuit by a test operation by an external tester; and a replacement section that replaces a part of the resistive element with the resistive element provided by the redundancy circuit by controlling a gate transistor of the part of the resistive element and the gate transistor of the resistive element provided by the redundancy circuit, based on the replacement data stored in the replacement data memory.