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HELP:VCO start problem

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liushangpiao

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Hi,everyone,
my vco using 3-order CSL cell,single input, does not start, i knwo the A0 of a cell
must be larger than 2,but i can never get it.And the problem is what is the input of a cell biased to get the A0>=2? The input nmos is in saturated region,then gm is very small ,how to get A0>2? thx....

Added after 15 minutes:

excuse me ...i have made a wrrtten mistake... the input nmos should be in linear region...
 

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thank u all the same.
but .i can't open the webs...
 

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