STABILIZATION CIRCUIT OF INPUT SIGNAL FOR IC TUNOR

摘要

an IC double conversion tuner including a first mixer for up-converting a radio frequency input signal into an oscillating signal of a first oscillator and a second mixer for down-converting an output signal of the first mixer into an oscillating signal of a second oscillator; a band-pass filter including variable tuning VHF low and high band-pass filters and a variable tuning UHF band-pass filter which respectively select a VHF low band, a VHF high band and a UHF band according to a selection voltage and filter only a radio frequency band of a corresponding line station channel in the selected band; and a wide-band low noise amplifier for amplifying the gain of the radio frequency signal outputted from the band-pass filter up to a predetermined level in accordance with an AGC control signal.