Patent ID: 8139015

Claim:
An amplification circuit comprising: an amplifier apparatus configured to amplify an input signal and output the amplified signal from an output terminal, the amplifier apparatus comprising an operational amplifier including a differential amplifier receiving the input signal and an output amplifier configured to amplify an output of the differential amplifier and provide an output signal at the output terminal, the output amplifier having a first capacitive element and a second capacitive element; and a boost circuit connected to the differential amplifier and the output amplifier, and configured to compare a voltage of the input signal and a voltage at the output terminal with respect to a given value, the boost circuit being configured to supply a positive or negative constant electrical current to at least one of the first capacitive element and the second capacitive element of the amplifier apparatus, wherein, the boost circuit is configured to electrically discharge one or both of the first and second capacitive elements when the voltage of the input signal is higher than the voltage at the output terminal by more than the given value, and the boost circuit is configured to electrically charge one or both of the first and second capacitive elements when the voltage of the input signal is lower than the voltage at the output terminal by more than the given value.