| 摘要 |
PROBLEM TO BE SOLVED: To provide a base station device capable of increasing the number of speech channels, without deteriorating the receiving characteristic. SOLUTION: An low-noise amplifier(LNA) 3 is placed at the preceding stage of an antenna shared unit 9, and the radio frequency signal received via the LNA 3 is branched into two signals by the unit 9. These branched frequency signals are led to receivers BA and BB, which contain the inter-receiving stage band-pass filters(BPF) 4, the 1st Mix(mixing) circuits 5 and the 1st intermediate frequency(IF) filters 6 respectively. Furthermore, the gain is given to the LNA 3 to satisfactorily compensate the branching loss of the unit 9. |
