Patent ID: 8552960

Claim:
An output amplifier circuit comprising: an input terminal that receives an input voltage; a differential stage having a first input supplied with a reference voltage, a second input, and first and second outputs; a first output stage having first and second inputs connected respectively to the first and second outputs of the differential stage; a second output stage having first and second inputs and having an output connected to a load; a capacitor element having a first end connected to the second input of the input pair of the differential stage; and a control circuit that controls switching between a first connection mode and a second connection mode, wherein the control circuit controls such that in the first connection mode, a non-conductive state is set between the first and second outputs of the differential stage and the first and second inputs of the second output stage, a non-conductive state is set between an output of the first output stage and the output of the second output stage, a conductive state is set between the output of the first output stage and the second input of the differential stage, and a conductive state is set between a second end of the capacitor element and the input terminal, the second end of the capacitor being supplied with the input voltage from the input terminal, and in the second connection mode, a conductive state is set between the first and second outputs of the differential stage and the first and second inputs of the second output stage; a conductive state is set between the output of the first output stage and the output of the second output stage; a non-conductive state is set between the output of the first output stage and the second input of the differential stage; a non-conductive state is set between the second end of the capacitor element and the input terminal; and a conductive state is set between the output of the first output stage and the second end of the capacitor element.