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Cascode current mirror with nMos

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gmeir11

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Hi all...

This is kinda theoretical question about how cascode current mirror works.
I've serached it all over the web and haven't found the answer.

cascode.jpg

The diode connection sets: Vgs1 = Vgs3 = Vds1 = Vds3
(given that all the transistors are the same).

After solving the nMos current equation, with taking in consideration the channel length modulation by (1+λVds)
I got Vgs1 = Vgs3 = Vds1 = Vds3 = Vgs2 = 2V

How can I now determine the current in the right branch (through N2, N4) ?
I've read that I can assume the voltage over N2 is constant. Why is that? and how does that assist me?

Thank !!! 8-O
 

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