Patent ID: 8310422
Filing Date: 2012-11-13
Classification: G09G,H03F

Abstract:
1. An operational amplifier circuit comprising: an input differential stage circuit supplied with power supply voltages in a first voltage range; an output stage circuit supplied with power supply voltages in a second voltage range which is different from said first voltage range; a positive polarity amplifier; and a negative polarity amplifier, wherein said operational amplifier circuit amplifies a signal supplied to said input differential stage circuit and outputs the amplified signal from said output stage circuit to drive a load, an input differential stage circuit of said positive polarity amplifier is supplied with first and second voltages as the power supply voltages, an output stage circuit of said positive polarity amplifier is supplied the second voltage and a third voltage higher than the first voltage as the power supply voltages, an input differential stage circuit of said negative polarity amplifier is supplied with the first voltage and the second voltage as the power supply voltages, and an output stage circuit of said negative polarity amplifier is supplied with the first voltage and a fourth voltage lower than the second voltage as the power supply voltage.