OPERATIONAL AMPLIFIER

PROBLEM TO BE SOLVED: To provide an operational amplifier having a wide-frequency usable band, that is protected against oscillations, even if it is used as a negative feedback path is connected to it, and produces less noise. SOLUTION: The operational amplifier amplifies the difference between two input voltage signals, inputted to a non-inverting input terminal and an inverting input terminal and outputs it to an output terminal. The operational amplifier is equipped with an input voltage/current conversion stage which outputs the current signals containing a differential current component corresponding to the two input voltage signals inputted into the non-inverting input terminal and the inverting input terminal, a current-amplifying stage which current-amplifies current signals outputted from the input voltage/current conversion stage, and an output buffer stage which converts output current signals, outputted from the current amplifying stage, into voltage signals and applies them to the output terminal. COPYRIGHT: (C)2007,JPO&INPIT