Patent ID: 7978010

Claim:
An apparatus comprising: a differential amplifying unit configured to amplify and output an inputted differential voltage; a first mirroring unit configured to mirror a current flowing through a first output terminal of said differential amplifying unit, said first mirroring unit configured to output a mirrored first mirror current; a second mirroring unit configured to mirror a current flowing through a second output terminal of said differential amplifying unit, said second mirroring unit configured to output a mirrored second mirror current; a pull-up transistor connected between a first power source and an output node, said pull-up transistor configured to switch based on said first and second mirror currents; and a pull-down transistor connected between a second power source and said output node, said pull-down transistor configured to switch based on said first and second mirror currents, wherein said first mirroring unit comprises: a 1 st transistor connected between said first power source and said first output terminal including a gate and a drain connected to each other; a 2 nd transistor connected between said first power source and a gate of said pull-up transistor, said 2 nd transistor including a gate connected to the gate of said 1 st transistor; and a 3 rd transistor connected between said first power source and a gate of said pull-down transistor, connected to the gate of said 1 st transistor.