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能给三个电路图吗，谢谢了
建议楼主先复习下模拟电路知识，实在无法做这么低于基础的知识普及。这三种电路随便翻本模拟电路的书籍都会有，楼主即便是看了，看不懂，再来了提问都可以。。。
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建议楼主百度搜索“运放权威指南”看一下
http://www.amazon.cn/%E8%BF%90%E7%AE%97%E6%94%BE%E5%A4%A7%E5%99%A8%E6%9D%83%E5%A8%81%E6%8C%87%E5%8D%97/dp/B0042G7I26/ref=sr_1_1?ie=UTF8&qid=1394519189&sr=8-1&keywords=%E8%BF%90%E6%94%BE%E6%9D%83%E5%A8%81%E6%8C%87%E5%8D%97
