RF summing and auto gain control circuit in digital versatile disc player system

摘要

Al-digital versatile disc player system. The F summation and automatic gain control circuit is disclosed. Al of the digital versatile disk player system according to the present invention. F. summation and the automatic gain control circuit is seen to be applied through at least one input terminal, F (RF) sum signals and the summed signal is amplified by a predetermined amplification gain and, transconductance component coupled to the input terminal and the input terminal of the first amplifier is determined by the resistance component of the amplification gain between the output terminal, is connected between the output terminal and at least one input terminal of the first amplifier, a predetermined at least one variable resistor, n externally applied (n is an integer of 1 or more) for adjusting the resistive component to vary the resistance value in response to a resistance adjustment signal by decoding the bit a predetermined signal to automatically adjust the resistance of the variable resistor amplifying the output signal of the interface circuit and the first amplifier for generating a resistance adjustment signal, characterized by a second amplifier for outputting the amplified result. According to ; This invention, even if the amplitude of the input signal is changed, the automatic gain control circuit has the effect of automatically adjusting the amplification gain. In addition, RF signal summing & amp; By the automatic gain control performed in a more stable operation of the circuit, the effect that the correct data can be restored from the DVD player.