Down converter using C/N ratio correcting circuit of base station for mobile communication network

A down converter using a C/N ratio correcting circuit of a base station for a mobile communication network comprising:

• a first splitter for splitting an RF signal applied from an antenna;
• a VGA for controlling the gain of the RF signal split by the first splitter;
• an IF processing part for receiving the RF signal gain-compensated by the VGA and converting it to an IF signal;
• an amplifier for amplifying the RF signal split by the first splitter;
• a first voltage detect circuit for converting the RF signal applied from the amplifier to a voltage;
• a second voltage detect circuit for converting the IF signal fedback from the IF processing part to a voltage;
• and
• a comparator for comparing the voltage applied from the second voltage detect circuit and the voltage applied from the first voltage detect circuit and controlling the VGA.

A down converter using a C/N ratio correcting circuit of a base station for a mobile communication network comprising:

• an IF processing part for converting an RF signal having a predetermined gain to an IF signal;
• a VGA for controlling the gain of the RF signal applied to the IF processing part;
• and
• a control voltage generator for comparing the IF signal fedback from the IF processing part and the RF signal applied from the antenna and controlling the VGA.