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发表于 2011-1-24 14:41:25
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I guess I get the answer: when the source of M19 rise, I find that the source of M16 also rise. As the gate of M16 is fixed, the sum of M19 and M20 decreases. As jlinky said, at this time M19 is shut off, therefore the current flowing through M20 maybe decrease. Because the gate of M20 is also fixed, the source of M20 rise. |
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