Patent ID: 8390336

Claim:
A semiconductor apparatus that operates based on a first power supply for supplying a first voltage, a second power supply for supplying a second voltage lower than the first voltage, and a third power supply for supplying a third voltage in between the first voltage and the second voltage, comprising: an output circuit that includes at least one transistor where a signal having an amplitude ranging from the second voltage to the first voltage is input to a gate, and outputs a first output signal having an amplitude ranging from the second voltage to the first voltage; and a control circuit that generates, based on an input signal, a first control signal for controlling a voltage at a gate of a transistor included in the output circuit, a second control signal for controlling a voltage in a back-gate region of the transistor, and a third control signal for controlling a voltage in a deep well region providing electrical isolation between the back-gate region and a semiconductor substrate region, wherein the control circuit sets a voltage difference between the first control signal and the second control signal to be equal to or smaller than a larger one of a voltage difference between the first voltage and the third voltage and a voltage difference between the second voltage and the third voltage.