METHOD FOR PREVENTING CHANNEL RECEIVING SENSITIVITY FROM FALLING IN EUROPEAN STYLE MOBILE COMMUNICATION TERMINAL

摘要

PURPOSE: A device for transmitting/receiving in an European style mobile communication terminal is provided to improve a receiving sensitivity of a receiving channel, corresponding to 13MHz high frequency integral times, by using an electromagnetic interface(EMI) having a high attenuating characteristic in corresponding frequency bands. CONSTITUTION: A device for preventing a channel receiving sensitivity from being falling comprises: a low noise amplifying section, to which a radio signal received by an antenna is inputted through a duplexer, a band-pass filter, and a matching circuit, a predetermined power supply is applied, operating after a predetermined bias signal is inputted, low amplifying the radio signal to output; a receiving power supply on/off terminal, to which a controlling signal for saving power supply to turn on/off the low noise amplifying section is inputted through a digital signal line; a power supply terminal, to which operating power supply is applied; a bias terminal applying bias voltage to the low noise amplifying section; a radio frequency section controller having a radio frequency power supply terminal for applying the operating power supply to a low noise amplifier; an electromagnetic interface eliminating the predetermined noise inputted through the digital line and connected between the digital lines.