前置放大器的设计不单是一个纯电子学的问题,而是光敏元件如何正确使用的问题,要求前置放大器对探测器提供的噪声降到最小。本文的目的在于介绍红外光生伏特探测器HgCdTe、InSb的噪声机理与工作点的偏置方法,并介绍了前置放大器的噪声机理以及测量参数,讨论了放大器对不同性能的探测器提供的噪声系数F_d,文章也给出了低噪声变压器的设计。 The design of the preamplifier is more than a pure electronics issue, but a matter of how the light-sensitive components are used correctly, requiring the preamplifier to minimize the noise the detector provides. The purpose of this paper is to introduce the noise mechanism of the HgCdTe and InSb detectors and the working point biasing method. The noise mechanism and measurement parameters of the preamplifier are introduced. The noise figure of the amplifier for the different performance detectors is discussed. F_d, the article also gives the design of low-noise transformer.