搜索 - 科创

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具体来说，电路总噪声与JFET管的噪声、运算放大器的噪声满足下面的关系：也就是说，电路的总噪声是JFET管噪声和运放噪声的平方和，但运放噪声要除以JFET管放大级的开环增益。

但在特定的小众应用领域，JFET管具有不可替代的优势，比如我关注的低噪声、低失调放大电路。这是因为，分立JFET管可以设计更大的硅片面积，并配置更高的工作电流，不受封装方案的影响。

继续折腾老频谱仪，目前遇到的问题有jfet管子D和G击穿引起运放烧损，十字架射频管热失效，贴片电解漏液导致贴片电容腐蚀出现裂痕以及电阻阻值变大。

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