E*****a 发帖数: 757 | 1 现在有3个(或n个)电压值,
怎么样用简单的逻辑和模拟电路单元
搭个最简单的电路,从中选择电压最小的输出
比如A,B, C选最小的,比如B输出?
我想的办法比较笨:
先AB比较器,drive一个fet让小的通过,但是这一步就需要2个比较器,2个fet
如果是n个值,要(n-1)*2个比较器/fet
有什么简单思路么?谢谢 |
f*****0 发帖数: 489 | 2 somehow, I think you can do that with a few diodes. |
E*****a 发帖数: 757 | 3 好方法,但是找highest可以啊,用最高的overide其他的
lowest呢?
这个办法好不好:
用个voltage 接个电阻和cap,然后接diode到每个值上
总之你提醒的棒!谢谢
【在 f*****0 的大作中提到】![](/moin_static193/solenoid/img/up.png) : somehow, I think you can do that with a few diodes.
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E*****a 发帖数: 757 | 4 成了!
【在 E*****a 的大作中提到】![](/moin_static193/solenoid/img/up.png) : 好方法,但是找highest可以啊,用最高的overide其他的 : lowest呢? : 这个办法好不好: : 用个voltage 接个电阻和cap,然后接diode到每个值上 : 总之你提醒的棒!谢谢
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f*****0 发帖数: 489 | 5 see, if you think simple, you will always find a simple and elegant solution
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E*****a 发帖数: 757 | 6 哈哈哈哈
nodnod
solution
【在 f*****0 的大作中提到】![](/moin_static193/solenoid/img/up.png) : see, if you think simple, you will always find a simple and elegant solution : .
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M*******c 发帖数: 4371 | 7 theoretically yes。
in reality,you need transistors because you want to get the original
voltage not the one with 0.7V less.
【在 f*****0 的大作中提到】![](/moin_static193/solenoid/img/up.png) : somehow, I think you can do that with a few diodes.
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E*****a 发帖数: 757 | 8 老大,讲讲为什么theoretically yes?
这个theory怎么考虑?thanks
【在 M*******c 的大作中提到】![](/moin_static193/solenoid/img/up.png) : theoretically yes。 : in reality,you need transistors because you want to get the original : voltage not the one with 0.7V less.
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f*****0 发帖数: 489 | 9 if you want to offset the 0.7v drop you can reference the output to a
negative Vf - that can be done with a resistor, a diode and a negative rail. |
E*****a 发帖数: 757 | 10 yea!that'd what i did.
rail.
【在 f*****0 的大作中提到】![](/moin_static193/solenoid/img/up.png) : if you want to offset the 0.7v drop you can reference the output to a : negative Vf - that can be done with a resistor, a diode and a negative rail.
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