Patent ID: 7515886

Claim:
A digital broadcast receiving tuner comprising; a down-converting unit which directly converts a high-frequency signal into a baseband signal, or converts a high-frequency signal into an intermediate frequency signal and then further converts said intermediate frequency signal into a baseband signal; a gain-adjusting unit which adjusts a level of said high-frequency signal and/or said intermediate frequency signal in correspondence with an automatic gain control (AGC) controlling voltage supplied from an external source; an amplifier which adjusts a level of said baseband signal; and a controlling unit which controls a gain of said amplifier in response to a signal being independent of said AGC controlling voltage wherein said signal independent of said AGC controlling voltage is one that reflects frequency characteristics of a level of received signals within a receivable frequency band width and is a signal output from a versatile port of a semiconductor integrated circuit device loaded in said down-converting unit.