Amplifier circuitry, voltage regulator circuit, and signal compensation method

A voltage regulator circuit configured to compensate a common-mode output signal generated by an amplifier circuit through two load resistors, wherein the amplifier circuit is biased by a supply voltage and a first bias current, and the voltage regulator circuit comprises:

• a first compensation resistor configured to receive a reference current;
• a second compensation resistor coupled between the first compensation resistor and a ground, wherein the second compensation resistor is configured to cooperate with the first compensation resistor to generate a reference voltage according to a second bias current and the reference current,
• wherein a first ratio is present between the second bias current and the first bias current, a second ratio is present between the second compensation resistor and one of the load resistors, and the first ratio and the second ratio are arranged to compensate the common-mode output signal;
• and
• a regulator configured to adjust the reference voltage to generate the supply voltage.

A signal compensation method, comprising:

• generating a first bias current by a current source circuit;
• generating a supply voltage by a voltage regulator circuit adjusting a reference voltage, wherein the voltage regulator circuit comprises a first compensation resistor and a second compensation resistor, the first compensation resistor and the second compensation resistor are configured to generate the reference voltage according to a reference current and a second bias current, and a first ratio is present between the second bias current and the first bias current;
• and
• generating a first common-mode output signal by a first amplifier, wherein the first amplifier comprises a plurality of first load resistors, the plurality of first load resistors are configured to generate the first common-mode output signal according to the supply voltage and the first bias current,
• wherein a second ratio is present between the second compensation resistor and one of the plurality of first load resistors, and the first ratio and the second ratio are arranged to compensate the first common-mode output signal.