Patent ID: 7133651

Claim:
A transmission apparatus of a mobile communication terminal comprises: a modem for outputting an intermediate frequency (IF) signal, and an auto gain control(AGC) signal; a gain controller for adjusting a gain of the IF signal; a power controlling circuit for adjusting the AGC signal according to temperature change of the terminal, and applying the adjusted AGC signal to the gain controller, the power controlling circuit including a first resistor coupled in parallel to a thermistor to form a voltage divider, the voltage divider dividing the AGC signal based on resistance values of the first resistor and the thermistor to generate the adjusted AGC signal; and a transmission signal processing block for converting the IF signal whose gain is adjusted, into a radio frequency (RF) signal, amplifying and bandwidth filtering the converted RF signal, then amplifying power of the RF signal as much as the RF signal can reach a receiving side, and emitting the amplified RF signal.