Patent ID: 7203468

Claim:
A signal generation device for a transmission device, comprising: an object signal generation unit operable to generate, according to a source signal, an object signal so that out-of-band noise therein is reduced to Pnoise [dBm/Hz]; and a radio frequency unit operable to frequency convert or modulate the object signal by mixing with a local signal, and to generate a radio frequency signal for a transmission frequency band by amplifying the frequency converted or modulated signal to a predetermined level; wherein if NF [dB] and G [dB] are respectively a noise figure and a gain of the radio frequency unit, and Pin [dBm] is a signal level of the object signal, the radio frequency unit is structured so that (NF+G) is less than or equal to a first predetermined value, and the object signal generation unit is structured so that Pin is greater than or equal to a second predetermined value.