标题： 信噪比优化共射放大器 显示英文标题

标题： SNR Optimization for Common Emitter Amplifier

摘要： 在本文中，我们研究了共发射极放大器（CEA）基极电阻的热噪声对输出信噪比（SNR）的影响，并表明在CEA输出处使用一阶巴特沃斯滤波器显著提高了输出SNR，并抑制了高阶巴特沃斯、切比雪夫I、II和椭圆滤波器的性能。 我们提出了一种公式，用于选择模拟滤波器的截止频率，以在CEA输出处实现显著的SNR改善。 考虑到滤波器的复杂性和输出SNR的改善，我们可以得出结论，一阶巴特沃斯滤波器优于切比雪夫I、II和椭圆滤波器。 显示英文摘要

摘要： In this paper we investigate the effects of the thermal noise of the base resistance of common emitter amplifier (CEA) on the output SNR, and we show that a first order Butterworth filter at the output of the CEA significantly improves output SNR significantly and supress the performances of higher order Butterworth, Chebyshev I, II and elliptic filters. We propose a formula for the selection of cut-off frequency of analog filters for given orders to achieve significant SNR improvement at CEA output. Considering the filter complexity and output SNR improvement, we can conclude that the first order Butterworth filter outperforms Chebyshev I, II and elliptic filters.