Device and method for upconverting signal in wireless communication system

A device for up-conversion in a wireless communication system, the device comprising:

• at least one transceiver;
• and
• at least one processor functionally coupled to the at least one transceiver,
• wherein the at least one processor is configured to:
• receive a first local oscillator (LO) signal,
• generate a second LO signal, based on the first LO signal and cross-coupled latches,
• receive an input signal,
• generate an upconverted frequency signal, based on the second LO signal and the input signal,
• generate a upconverted radio frequency (RF) signal based on the generated upconverted frequency signal and a transconductance (GM) stage,
• generate a removal component, based on a size and a polarity of a harmonic component of the upconverted RF signal, and a negative transconductance (NGM) stage operating in a sub-threshold region, wherein the NGM stage is implemented by a pair of cross-coupled n-channel metal oxide semiconductor (NMOS) transistors,
• generate an output signal based on the upconverted RF signal and the removal component, and
• transmit the generated output signal.