| 摘要 |
PROBLEM TO BE SOLVED: To provide a direct conversion receiver capable of easily and appropriately correcting the phase error of an I-channel video signal and a Q-channel video signal and dealing with the variations in phase error due to the change of receiving frequency or ambient temperature. SOLUTION: This receiver is provided with at least a distributor 1 for bisecting and distributing a received RF signal, a distributor 2 for bisecting and distributing a local signal with a phase difference of 90 deg., mixers 3 and 4 for mixing the distributed received RF signals and local signals and outputting the I-channel video signal and the Q-channel video signal whose phases are mutually different by 90 deg., an analog/digital converter 7 for converting the output to a digital signal, a ROM 8 in which at least phase error information of the I-channel video signal and the Q-channel video signal are stored, and a phase shifter 9 for practically correcting the phase errors of the I-channel video signal and of the Q-channel video signal on the basis of the phase error information from the ROM 8. |
