| 摘要 |
A transceiver apparatus in a code division multiple access system is disclosed. The apparatus includes a low noise amplifier for amplifying a signal received via an antenna, a first filter for extracting components of a usable band from the amplified signal, and a voltage controlled amplifier for amplifying the filtered. A down mixer converts the amplified signal to an intermediate frequency, a second filter eliminates unnecessary waves generated during the conversion operation of the down mixer, and an automatic gain controlled amplifier amplifies the signal filtered by the second filter. A demodulator demodulates the signal amplified by the automatic gain controlled amplifier, and a control unit receives the demodulated signal, and determines the degree of amplification of each amplifier based on the power level of the received signal, and outputs control signals respectively adapted to determine the degree of amplification and whether or not an amplification should be conducted in a drive amplifier, based on the power level of the received signal.
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