Current-voltage converter circuit and its control method

摘要

An input current flowing into a current-voltage conversion circuit ( 1 ) is converted to a voltage value at an output terminal SAIN and, then, a differential amplification circuit ( 5 ) amplifies and outputs a differential voltage between the voltage value and the reference voltage Vref. PMOS and NMOS transistors T 1 , T 2 are connected between the output terminal SAIN and the power-supply voltage VCC. After the output terminal SAIN is precharged to the power-supply voltage VCC by making the transistors conductive, the current-voltage conversion operation is performed by making a voltage drop corresponding to the input current. The precharge operation precharges the output terminal SAIN up to the power-supply voltage VCC and supplies precharge to a common data line N 3 and bit lines.