Provided is a signal generator applied to a UWB direct-conversion RF transmission/reception apparatus. The signal generator includes a voltage controlled generator 110 for generating a signal of a 6 GHz band, a PLL 120 for locking the 6 GHz band signal to an accurate signal of 6336 MHz, a /4 divider 130 for dividing the 6336 MHz signal from the PLL 120 at a division ratio of /4, an SSB l mixer 150 for mixing the output signal from the /4 divider 130 with the 6336 MHz signal from the PLL 120, a /2 divider 160 for dividing the mixed signal from the SSBl mixer 150 at a division ratio of /2, a prescaler 170 for dividing the 6336 MHz signal from the PLL 120 at a division ratio of /3, /4 or /6 according to an external selection signal, and an SSB2 mixer 180 for mixing the output signal from the /2 divider 160 with the divided signal from the prescaler 170. Accordingly, it is possible to minimize generation of spurious signals and harmonic signals by generation of only one channel signal at the time of 't=tl' and to reduce power consumption and a design area by minimization of the number of required components. Consequently, the signal generator can be manufactured at a low cost.
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