老板要求做一个电流源，要求输出阻抗越大越好，输出电流在几十mA，正弦波，请问各位大神，我可以从哪些方面进行资料的寻找或者有哪些合适的芯片？
在论坛上看到的关于电流源的帖子，http://www.deyisupport.com/question_answer/analog/amplifiers/f/52/t/72044.aspx，好像都是用于直流的？还是可以用于交流，只是我不会？
还望各位帮帮忙，谢谢~~
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