| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a direct RF modulation transmitter capable of saving more power consumption. <P>SOLUTION: The direct RF modulation transmitter comprises: a passive mixer circuit 100 which inputs digital baseband data D of 1 bit, inverted data DN, a first RF signal, and a second RF signal whose phase is different from that of the first RF signal by 180 degrees and outputs a first voltage signal and a second voltage signal; and a plurality of unit blocks which include a MOS transistor 107, and MOS transistors 105, 106 which convert constant current generated by the MOS transistor 107 to a first output signal and a second output signal in accordance with the first voltage signal and the second voltage signal outputted from the passive mixer circuit 100. The direct RF modulation transmitter modulates the first RF signal and the second RF signal by a digital baseband signal comprising digital baseband data of a plurality of bits and adds the output signals from the respective unit blocks. <P>COPYRIGHT: (C)2013,JPO&INPIT |
