Transmission apparatus and method for a mobile communication terminal

A transmission method for a mobile terminal including an AGC amplifier for AGC-amplifying an input baseband signal, a frequency conversion part for converting an output signal of the AGC amplifier to an RF signal, an amplifying part for power-amplifying an output signal of the frequency conversion part, and an antenna, the method comprising the steps of:

• detecting field strength of a signal received from a base station;
• determining output power of the mobile terminal according to the detected field strength of the received signal;
• directly transmitting an output signal of the frequency conversion part through the antenna, when the determined output power of the mobile terminal is lower than predetermined maximum output power of the AGC amplifier, without transmitting through the amplifying part.

A transmission method for a mobile terminal including an AGC amplifier for AGC-amplifying an input baseband signal, an attenuator for attenuating an output signal of the AGC amplifier, a multiplier for multiplying an output signal of the attenuator by a carrier frequency signal to convert the signal into an RF signal, a first filter for filtering an output signal of the multiplier, a drive amplifier for amplifying an output signal of the first filter, a second filter for filtering an output signal of the drive amplifier, a power amplifier for amplifying an output signal of the second filter, and an antenna, the method comprising the steps of:

• determining output power of the mobile terminal;
• and
• transmitting the output signal of the AGC amplifier through the multiplier, the first filter and the antenna, when output power of the mobile terminal is lower than predetermined maximum output power of the AGC amplifier, without transmitting through the attenuator, the drive amplifier, the second filter and the power amplifier.

A transmitting method of a mobile terminal including an AGC amplifier, an attenuator, a drive amplifier, a power amplifier and an antenna, said method comprising the step of blocking power supply voltage which is provided to the drive amplifier and the power amplifier and transmitting output signal of the AGC amplifier through the antenna without transmitting through the attenuator, the drive amplifier and the power amplifier when output power of the mobile terminal is lower than the maximum output power of the AGC amplifier predetermined.