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When you switch on the current, There can be a possibility that vbiasp reduced to zero and vcasp node(uncertain or may be at vdd), then no current will be mirrored. In that case i have to add a start up, to pull down the "vcasp" node and pullup "vcasn" node. if it is ok how can i add start up here
When you switch on the current, There can be a possibility that vbiasp reduced to zero and vcasp node(uncertain or may be at vdd), then no current will be mirrored. In that case i have to add a start up, to pull down the "vcasp" node and pullup "vcasn" node.
You are right: there exists another stable operating point, possibly depending on the topology of your original current source. So to be on the safe side, you better add a start-up circuit (which pulls up vbiasp until vdd is settled).
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