Patent ID: 8854126

Claim:
A semiconductor device comprising: an amplifier circuit that has an inverting input terminal, a non-inverting input terminal, and an output terminal; a first variable voltage source that generates a first bias voltage having a voltage value corresponding to a first set value; a second variable voltage source that generates a second bias voltage having a voltage value corresponding to a second set value; a first resistor whose one end is connected to the inverting input terminal; a second resistor that is connected between the output terminal and the inverting input terminal; a third resistor whose one end is connected to the non-inverting input terminal; and a fourth resistor that is connected between the second variable voltage source and the non-inverting input terminal, wherein the first bias voltage is provided to at least one of other end of the first resistor and other end of the third resistor, and an input signal is provided to at least other one of the other end of the first resistor and the other end of the third resistor.