The present disclosure discloses an active mixer capable of improving linearity while giving consideration to both gain and noise reduction, including: a voltage-to-current converting circuit operable to generate a conversion signal according to an input signal; a switching circuit operable to carry out a switching action according to a clock signal and thereby electrically connect the voltage-to-current converting circuit with a load circuit; the load circuit operable to provide an output signal for a first and a second output nodes according to the conversion signal through the switching action; a first supplement current source, coupled to a first node between the switching circuit and the first output node, operable to supply a first supplemental current to the switching circuit; and a second supplement current source, coupled to a second node between the switching circuit and the second output node, operable to supply a second supplemental current to the switching circuit.
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