Intermediate frequency circuit of digital television tuner having flat transmission characteristic in intermediate frequency band

摘要

Disclosed is an intermediate frequency circuit of a digital television tuner having a flat transmission characteristic in an intermediate frequency band and in which a transistor is prevented from being destroyed by a shock wave such as static electricity applied on the output side. This intermediate frequency circuit has: a transistor (2) for amplifying a television signal in an intermediate frequency band; a low-pass filter (5) provided between a collector of the transistor and an output terminal; and a parallel tuning circuit (3) provided between the collector of the transistor and the ground. Each of a cutoff frequency of the low-pass filter and a tuning frequency of the parallel tuning circuit is set to be equal to or higher than the intermediate frequency band.