| 摘要 |
PURPOSE: A wireless signal transceiving device through a voltage control of a local oscillating amplifier in a wireless communication system is provided to change a bias voltage of the local oscillating amplifier, and to control gains of transceiving mixers according to a local oscillating power size. Therefore, it is possible to substitute a function of an automatic gain control amplifier, and to simply an RF(Radio Frequency) transceiving terminal structure. CONSTITUTION: A main processor(21) controls an RF(Radio Frequency) transceiving function, and controls to perform an automatic gain control by the first and the second local oscillating amplifier(24,25). A local oscillator(22) makes a frequency corresponding to a difference between an IF(Intermediate Frequency) and the RF, and outputs a local oscillating power. A power distributor(23) distributes signals outputted from the local oscillator(22). The first and the second local oscillating amplifier(24,25) respectively receive the distributed signals, and perform a local oscillating amplification and an automatic gain control amplification according to control of the main processor(21). The first mixer(26) receives the amplified signal from the first local oscillating amplifier(24), and receives an IF transmitting signal, then mixes the amplified signal with the IF transmitting signal to output an RF transmitting signal. The second mixer(27) receives the amplified signal from the second local oscillating amplifier(25), and receives an RF receiving signal to output an IF receiving signal.
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