Patent ID: 8193862

Claim:
A multi-stage amplification type class-AB operational amplifier comprising: an amplification stage having plural amplification sections formed in multiple stages; and a class-AB output stage having a bias section and an output section, wherein an input signal input to the amplification stage is sequentially amplified by the plural amplification sections, and further amplified by the bias section and the output section of the class-AB output stage, a positive supply voltage applied to the amplification stage is different from a positive supply voltage applied to the class-AB output stage, a negative supply voltage applied to the amplification stage is different from a negative supply voltage applied to the class-AB output stage, the positive supply voltage applied to the amplification stage is equal to or greater than the positive supply voltage applied to the class-AB output stage, and the negative supply voltage applied to the amplification stage is equal to or less than the negative supply voltage applied to the class-AB output stage.