带隙基准问题 新手求助,求大神指导一下
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电路与拉扎维书上的经典带隙基准(11.15)相似,只是没有采用两个BJT串联。 调节电阻的大小,要么输出在1.25左右时,曲线不符合(负温度系数偏大),要么曲线吻合,输出电压高于1.3.。弄了好久了,一直不得其法,求大神指导,不胜感激
上图吧
The bandgap voltage is not always 1.25V.
The target of bandgap is to get a temp. independent voltage.
If your bandgap voltage is 1.3V, you can use a resistor divider to get 1.25V.
mpig

Correct…… silicon bandgap energy is 1.12eV,and a bandgap energy referenced BGR is 1.12V+a*Vpt (refer to razavi book), where a is process related. Just use the design when you get the best TC.
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