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THS1408的热阻Rjb是多大啊，怎么计算？
您好，可能THS1408这颗运放比较老了，只提供了theta Ja和Jc，没有给出theta Jb的热阻参数。我看了几款其他运放都提供了热阻参数，包括theta Jb。
Theta Jb的定义为Junction-To-Board。参考这篇应用手册Page10的section4 4 Rθ(JB) Junction-To-Board的详细介绍以及测试方法：
https://www.ti.com/lit/an/spra953c/spra953c.pdf
