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本文对IRM红外线分析仪前置放大器的工作原理及设计原则作了较系统的分析。首先从转换灵敏度的概念和推导的计算公式出发,讨论了提高前置级灵敏度和稳定性的方法。对噪声的产生原因、抑制方法及对关键元件参数的要求也作了介绍。文章较多地介绍了调制法前置级的工作原理及设计原则,不仅对常见的调频型和调幅型电路作了介绍,而且还介绍了一种脉冲调宽型电路可供科研、生产部门的技术人员参考。
In this paper, IRM infrared analyzer preamplifier working principle and design principles made a more systematic analysis. First of all, based on the concept of conversion sensitivity and the derivation of the formula, the methods to improve the sensitivity and stability of the preamp are discussed. The causes of noise, suppression methods and the requirements of key components parameters are also introduced. The article introduces the working principles and design principles of the pre-modulation method, introduces not only the common FM and AM circuit, but also introduces a pulse width modulation circuit for scientific research and production department Technical staff reference.