Mixer with filtering function and method for linearization of mixer

A mixer with a filtering function, comprising:

• at least one amplifier, configured to output a filtered voltage signal according to an input voltage signal;
• a transconductance device, coupled to the at least one amplifier, configured to receive the filtered voltage from the at least one amplifier and generate a filtered current signal according to the filtered voltage signal;
• and
• a feedback network, comprising a resistor-capacitor network, wherein one terminal of the resistor-capacitor network is directly coupled to any output terminal among at least one output terminal of the transconductance device, and another terminal of the resistor-capacitor network is directly coupled to an input terminal of the at least one amplifier;
• wherein the mixer is configured to output a modulated signal according to the filtered current signal.

A method for linearization of a mixer, comprising:

• utilizing at least one amplifier of the mixer to output a filtered voltage signal according to an input voltage signal;
• utilizing a transconductance device of the mixer to receive the filtered voltage from the at least one amplifier and generate a filtered current signal according to the filtered voltage signal, wherein the transconductance device comprises a transistor, and a gate terminal of the transistor is configured to receive the filtered voltage signal;
• and
• utilizing a feedback network of the mixer to provide a feedback path from any output terminal among at least one output terminal of the transconductance device to an input terminal of the at least one amplifier, wherein the feedback network is coupled between a source terminal of the transistor and the input terminal of the at least one amplifier;
• wherein the mixer is configured to output a modulated signal according to the filtered current signal.