特点：产品增益带宽高，输出电容小，噪声系数低。
Features: High gain bandwidth product, small output capacitance, low noise figure.
特点：高功率增益，低噪声输出，非常低的。
Features: High power gain, low noise figure, very low intermodulation distortion.
像这样，因为增益和输入是同样频率，低通放大器容易探测到的直流器件，呈现放大器输出。
In this case, because the gain and input are at the same frequency content, a dc component, which a lowpass filter can easily detect, is present at the amplifier's output.
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