| 摘要 |
A repeater system is provided to apply IF(Intermediate Frequency) SAW(Surface Acoustic Wave) filters whose central frequencies are different to a transmitter and a receiver, and to allow the transmitter and the receiver to share one PLL(Phase Locked Loop) supplying a single local frequency, thereby being miniaturized in size. Down mixers(320,420) and up mixers(340,440) comprised in a transmitter(300) and a receiver(400) are provided with a local frequency required for frequency conversion from one PLL(500). The transmitter(300) and the receiver(400) are individually equipped with IF SAW filters(330,430) whose central frequencies are separated from each other at predetermined levels. The PLL(500) supplies the single local frequency to each of the down mixers(320,420) and the up mixers(340,440).
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