Up-converter and mobile terminal having the same

An up-converter for converting a baseband signal into a radio frequency (RF) signal, the up-converter comprising:

• a first transistor and a second transistor each having a gate to which a baseband voltage is applied;
• a third transistor having a drain connected in parallel to a drain of the first transistor;
• a fourth transistor having a drain connected in parallel to a drain of the second transistor;
• a fifth transistor having a source connected in series to the drain of the first transistor and outputting a first RF signal through a drain;
• and
• a sixth transistor having a source connected in series to the drain of the second transistor and outputting a second RF signal through a drain, wherein a V2LO voltage is applied to gates of the third transistor and the fourth transistor, and a VLO+ voltage is applied to gates of the fifth transistor and the sixth transistor,
• wherein the drain of the first transistor and the drain of the second transistor output a first RF signal and a second RF signal through a transistor connected in series, respectively,
• wherein the VLO+ voltage is applied in the form of an LO pulse signal, and
• before the LO pulse signal is generated and applied to the gates of the fifth transistor and the sixth transistor, the V2LO voltage is pulled low to below a threshold value to perform charge removal during an OFF cycle of the LO pulse signal.