APPARATUS FOR SUPPRESSING LOCAL SIGNAL INTERFERENCE IN A TRANSCEIVER, PARTICULARLY FOR MINIMIZING INTERFERENCE BETWEEN LOCAL SIGNALS WHEN SIGNALS OF ADJACENT FREQUENCY ARE USED IN A TRANSCEIVER BOARD HAVING TWO OR MORE SYNTHESIZERS

摘要

PURPOSE: An apparatus for suppressing local signal interference in a transceiver is provided to minimize interference between local signals by using lower side and upper side local signals required for frequency mixing. CONSTITUTION: The first mixer(101) mixes(f1-fLo1) the first signal(f1) to be frequency down-converted and a local signal(lower side local)(fLo1) of low frequency band, and outputs it. The second mixer(102) mixes(fLo2-f2) the second signal(f2) which is adjacent to the first signal(f1) and is to be frequency down-converted and a local signal(upper side local)(fLo2) of frequency band higher than the local signal of low frequency band, and outputs it.