DIRECT CONVERSION RECEIVER

摘要

PROBLEM TO BE SOLVED: To provide a direct conversion receiver reducing cross talk modulating distortion and inter-modulation distortion. SOLUTION: A distributor 47 distributes received RF signals respectively to input to an I-phase base band conversion part 14 and a Q-phase base band conversion part 15; the I-phase base band conversion part converts the received RF signal to an I-phase base band signal by using a local oscillation frequency 22; a Q-phase base band conversion part converts the received RF signal to a Q-phase base band signal by using the frequency 22; an I-phase filter 42 extracts an I-phase interfering wave component from the I-phase base band signal; a Q-phase filter 43 extracts a Q-phase interference wave component from the Q-phase base band signal. The I-phase interference signal and the Q-phase RF interfering signal are frequency-converted to an RF band again by an I-phase RF conversion part 44 and a Q-phase RF conversion part, and these interference wave signals are mixed by a mixer 46 and inputted to the received RF signal by an adder 48 to reduce the interference wave component.