基于直接下变频的系统架构，接收机集成了低噪声放大器、I/Q下变频器、去直流偏移滤波器、基带放大器和信道选择滤波器。

Based on a direct-conversion architecture, the receiver integrates LNA, I/Q mixer, DC-offset removal filter, baseband amplifier and channel-select filters on a single chip.

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高频带通滤波器（几百 MHz）用于电 话中心局的信道选择。

High-frequency band-pass filters(several hundred MHz) are used for Channel selection in telephone central offices.

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