Operational amplifier with decreased through current, and display panel driver and display device incorporating the same

摘要

An operational amplifier is provided with: a high-side output transistor connected between an output terminal and a positive power supply line; a low-side output transistor connected between the output terminal and a negative power supply line; a first capacitor element connected between a first node and the output terminal; a second capacitor element connected between a second node and the output terminal; a first PMOS transistor having a source connected to the gate of the high-side output transistor and a drain connected to the gate of the low-side output transistor; a first NMOS transistor having a source connected to the gate of the low-side output transistor and a drain connected to the gate of the high-side output transistor; a second PMOS transistor having a source connected to the first node and a drain connected to the gate of the high-side output transistor; and a second NMOS transistor having a source connected to the second node and a drain connected to the gate of the low-side output transistor. The gates of the first and second PMOS transistors are commonly connected and fed with a first bias voltage, and the gates of the first and second NMOS transistors are commonly connected and fed with a second bias voltage.