High slew rate differential amplifier circuit

摘要

It is an object of the present invention to provide a high slew rate differential amplifier circuit that can reduce current consumption while maintaining stability. A P-type MOS sub-current source (6) having a current source circuit including a transistor (M18) having a gate voltage of a P-type MOS output transistor (M15) input to a gate thereof and a constant current source transistor (M17) connected in series with the transistor (M18), the current source circuit being connected in parallel with a constant current source transistor (M1) of a P-type MOS differential input section (1) is combined with an N-type MOS sub-current source (7) including a current source circuit including a transistor (M19) having a gate voltage of an N-type MOS output transistor (M16) input to a gate thereof and a constant current source transistor (M20) connected in series with the transistor (M19), the current source circuit being connected in parallel with a constant current source transistor (M6) of an N-type MOS differential input section (2). To increase a current through the differential input section when a high slew rate is required, the current source circuit including the transistor having the gate voltage of the output transistor input to the gate thereof and the constant current source transistor connected in series with the first transistor is used as a sub-current source for a differential circuit, in order to reduce a steady-state current.