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How do I minmise the Vgs drop across the Mosfet?

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ug02048

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vgs drop

I wanted to build a unity gain buffer. Any help is appreciated.
 

sooch cascode

use a cascode structure,the different w/l& you can reduce the vgs.
 

sooch bias

what is a sooch cascode ? can you explain it in detail because i have never heard of it before
 

sooch mos cascode current mirror

gray's book

page 271
 

mosfet vgs drop

can you upload a picture?
 

drop across the mosfet when it is on

Here is a picture of it. There exists also a good IEEE-paper from sooch describing this circuit.
 

Can you explain how it works? many thanks in advance..
 

Look for the Gray's Book p. 271 (perfectly explained) or the paten of Sooch:

N.S. Sooch "MOS Cascode Current Mirror" U.S. Patent 4,550,284 October 1985.
(look for a patent server)
 

I was never in favor of using this current mirror.
Much of the accuracy stemmed from accurate modelling. The circuit tries to bias the lower n-channels just enough for them to breath. this posed a great danger, any mishap can tipped u over into the triode. ur accuracy could suffer...
ur design need to be as free of modelling as possible
 

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