OPERATIONAL AMPLIFIER AND SPEAKER AMPLIFIER EMPLOYING THE OPERATIONAL AMPLIFIER

摘要

PROBLEM TO BE SOLVED: To provide an operational amplifier for outputting a waveform with less distortion independently of change in a battery power supply V_BAT.;SOLUTION: The operational amplifier is provided with: a regulator for receiving supply of the battery power supply and outputting a reference voltage; and a signal ground generator for transforming the reference voltage generated by the regulator depending on a value of the battery power supply and producing a signal ground. The operational amplifier is characterized in that the operational amplifier employs the battery power supply for its drive power supply and amplifies a waveform of an input signal into a waveform based on the signal ground generated by the signal ground generator.;COPYRIGHT: (C)2004,JPO