论文部分内容阅读
如果前置放大器的噪声性能不是用同一的表征单位来表征的话,选择低噪声前置放大器则会发生困难。本文介绍了通常最需要的几种换算方法。设计师探求提高信噪比(S/N)时,碰到的问题是对各种前置放大器进行比较。一些厂商使用作为频率函数的等效噪声电压密度(e_n)和等效噪声电流密度(i_n)曲线来
Choosing a low-noise preamplifier can be difficult if the noise performance of the preamplifier is not characterized by the same characterization unit. This article describes the most commonly needed conversion methods. When designers look for ways to increase S / N, the problem they encounter is comparing various preamplifiers. Some vendors use the equivalent noise voltage density (e_n) and equivalent noise current density (i_n) curves as a function of frequency