Thelen Reid & Priest LLP
Differential amplifier with reduced current consumption
 A differential amplifier comprising a first NMOS transistor having its gate for receiving a first input signal, a second NMOS transistor having its gate for receiving a second input signal, a first PMOS transistor connected between the first NMOS transistor and a supply voltage source, a second PMOS transistor connected between the second NMOS transistor and the supply voltage source and having its gate connected to a gate of the first PMOS transistor through a first common node, and a current source circuit connected between a second common node of the first and second NMOS transistors and a ground voltage source, the current source circuit including a third NMOS transistor having its gate for receiving an enable signal and a fourth NMOS transistor connected in series to the third NMOS transistor and having its gate for receiving the first or second input signal. According to the present invention, current consumption amount is reduced in a standby mode where no input signal is applied. 
Hyundai Electronics Industries Co., Ltd.
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Jung Pill
Kim