对下面文章重点段落进行翻译原文和翻译都要给出选取三段重点段落进行翻译满足信、达、雅的翻译要求Intermodulation Distortion of a BipolarCommon-Emitter Amplifier With Arbitrary EmitterImpedance and Input Matching NetworkG A M Hurkx and Edwin van der He

1.原文：

"The intermodulation distortion (IMD) of a bipolar common-emitter amplifier with arbitrary emitter impedance and input matching network is studied. A simple analytical expression for the IMD is derived. The effect of emitter resistance on the IMD is analyzed. The input matching network is optimized with respect to the IMD for the case of a constant emitter impedance. The results show that the IMD can be reduced significantly by proper selection of the input matching network."

2.翻译：

本文研究了具有任意发射极阻抗和输入匹配网络的双极共射放大器的交调失真（IMD）。导出了简单的分析表达式。分析了发射极电阻对IMD的影响。对于恒定发射极阻抗的情况，优化了输入匹配网络以使IMD最小化。结果表明，通过正确选择输入匹配网络可以显著降低IMD。

3.原文：

"The effect of emitter resistance on the IMD is analyzed. It is shown that the IMD decreases with increasing emitter resistance. However, if the emitter resistance is too high, the gain of the amplifier decreases and the noise performance deteriorates. Therefore, there is an optimum emitter resistance for minimum IMD. The optimum emitter resistance depends on the input power level and the value of the input matching network. For a given input power level, the optimum emitter resistance decreases with increasing input matching network quality."

4.翻译：

分析了发射极电阻对IMD的影响。结果表明，IMD随着发射极电阻的增加而减小。然而，如果发射极电阻过高，放大器增益会降低，噪声性能会恶化。因此，存在一个最佳的发射极电阻以达到最小IMD。最佳发射极电阻取决于输入功率水平和输入匹配网络的值。对于给定的输入功率水平，最佳发射极电阻随着输入匹配网络质量的提高而减小。

5.原文：

"The results show that the IMD can be reduced by proper selection of the input matching network. It is found that the optimum input matching network for minimum IMD is different from the optimum input matching network for maximum power transfer. Therefore, in order to minimize the IMD, the input matching network should be optimized specifically for that purpose. An example is given to illustrate the design procedure."

6.翻译：

结果表明，通过适当选择输入匹配网络可以降低IMD。发现最小IMD的最佳输入匹配网络与最大功率传输的最佳输入匹配网络不同。因此，为了最小化IMD，输入匹配网络应专门为此目的进行优化。给出了一个示例以说明设计过程