TUNNER

摘要

a broad band filter(16) filtering a television broadcast frequency band; a broad band RF amplifying unit(18) amplifying a RF signal from the broad band filter(16); a first synchronization unit(17) applying a resonant frequency to the broad band filter(16) and the broad band RF amplifying unit(18); a first mixer(20) mixing the output signal from the broad band RF amplifying unit(18) and the oscillating frequency from a PLL circuit(14); a second synchronization unit(19) fitting the output synchronization of the broad band RF amplifying unit(18); a first IF amplifying unit(22) amplifying the mixed signal from the first mixer(20); a second mixer(26) mixing a reference local oscillating frequency and a RF signal from the first IF amplifying unit(22); and a second IF amplifying unit(28) amplifying an IF signal from the second mixer(26).