放大器失真引起输入信号的频谱再生，这对相邻信道中的通信产生了干扰。

Amplifier distortion produces a dilation of the spectrum of the input signal (" spectral regrowth ") which causes interference to communications in adjacent channels.

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在远程光纤信道中，放大器自发辐射(ase)噪声是主要噪声源。

In the optical-fiber channel, amplified spontaneous emission (ASE) noise in the optical amplifier is the major source of noise.

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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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