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发表于 2012-6-3 13:08:00
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The AC performance, stability and output dynamic range of a folded cascode amplifier is built upon a stable DC bias, especially the ratiometic bias currents between the output stage and the input stage, which are hinged on the good matching of the current mirrors. Unfortunately, current mirrors doesn't work well at sub-threshold therefore you won't see a lot of folded cascode amplifiers work in this region. |
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