| 摘要 |
In a direct-conversion receiving apparatus it is possible to prevent unnecessary emission from an antenna as well as deterioration of the error rate characteristics caused by DC offsets, a power dividing unit 104 divides an RF signal amplified in an RF amplifier 103 into four signals of first through fourth RF signals, phase-shifters 105-107 shift the phases of the second through fourth RF signals by 180 DEG , 90 DEG and 270 DEG , respectively and mixers 108-111 generate first through fourth baseband signals by mixing the first RF signal and second through fourth RF signals after phase-shifting with local signals from a local oscillator 112, respectively. <IMAGE> |
