CHANNEL SELECTOR

摘要

PURPOSE:To attain high speed gain control in response to channel switching by providing plural capacitors between a gain control output terminal of RF AGC circuit and a gain control input terminal of a high frequency amplifier circuit and switching the capacitors in interlocking with the channel changeover. CONSTITUTION:Capacitors 11a-11n are switched by a switch 10 connected to the control output terminal of the RF AGC circuit 6. One of the capacitors is selected by a switch 12 interlocked with the switch 10 and connected to a gain control input terminal of a high frequency amplifier circuit 1b. Thus, one tuner switches plural channels in a high speed and the gain control is attained with high speed.