Amplifier device

An amplifier device comprising:

• an amplifying unit having a first end, a second end and a third end, wherein the first end of the amplifying unit is configured for electrically connecting to a voltage source, the second end of the amplifying unit is configured for receiving an input signal, the first end of the amplifying unit is configured for outputting an output signal amplified by the amplifying unit, and the third end of the amplifying unit is configured for electrically connecting to a first reference potential terminal;
• a bias module electrically connected to the second end of the amplifying unit for providing a bias voltage to the amplifying unit;
• an impedance unit electrically connected to the bias module and configured to receive a control voltage to adjust an impedance value of the impedance unit;
• and
• a first adjusting module comprising:
• a first amplifier having a first input end, a second input end and an output end, the output end of the first amplifier outputting the control voltage according to a source voltage and a first reference voltage to adjust the impedance value of the impedance unit, the source voltage being from the voltage source, and the first reference voltage being from a first reference voltage terminal;
• a first resistance selection circuit electrically connected between the first input end of the first amplifier and one of the voltage source and the first reference voltage terminal;
• a second resistance selection circuit electrically connected between the second input end of the first amplifier and another one of the voltage source and the first reference voltage terminal;
• a first feedback resistor electrically connected between the second input end of the first amplifier and the output end of the first amplifier;
• and
• a second feedback resistor electrically connected between the second input end of the first amplifier and the first reference potential terminal;
• wherein the bias module is configured to adjust linearity of the amplifier device according to the source voltage of the voltage source.