| 摘要 |
An up/down conversion system is provided to replace an existing external SAW(Surface Acoustic Wave) filter and an amplifier added due to the SAW filter by using an embedded filter and a buffer. An up/down conversion system comprises an amplification part(110), an up-mixer(130), a filter part(140), a buffer(150), and a down-mixer(170). The amplification part such as an LNA(Low Noise Amplifier) amplifies an inputted signal. The up-mixer is connected to the output stage of the amplification part. The filter part, arranged at the same substrate as the up-mixer, is formed at the output stage of the up-mixer. The buffer is connected to the filter part in serial. The down-mixer is connected to the output stage of the buffer. It is desirable that the second filter part is arranged between the buffer and the down-mixer.
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