The present invention relates to an ultra wideband frequency up-conversion device, and in particular to be supplied from the baseband circuit I, converting the Q voltage signal to a current signal I / Q voltage-current converter (101, 102); Mixing the converted baseband signal and one or more local oscillator signal into a current signal by up-I / Q frequency conversion to the RF band signal converter (103, 104); A common load summation circuit (105); High-frequency amplifier which provides gain across the RF frequency-converted by the UWB signal (106); And a differential signal, and characterized in that consists of the active balun (107) for converting into a single signal, the present invention can obtain a constant gain over a UWB frequency conversion by using the components of the minimum, and even in the local oscillator There are very effective components for reducing to a minimum the amount on a bad influence on the other radio transceiver system prevents the developer from leaking to the transmission antenna.
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