{HEAD ~ The cascoding} of NFET Qf2 630 and NFET Qf1 632 extends the range of Vds because NFET Qf1 632 is in the triode region for a small range of {TAIL ~ voltage} 1, and NFET Qf2 630 is in the triode region for a small range of voltage 2 
{ HEAD ~ The cascoding } of NFET Qf2 630 and NFET Qf1 632 extends the range of Vds because NFET Qf1 632 is in the triode region for a small range of { TAIL ~ voltage } 1 , and NFET Qf2 630 is in the triode region for a small range of voltage 2
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