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Sooch biasing circuit

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Junus2012

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Dear friends,

I am trying to use this circuit attached below for biasing the cascode transistors in of the Op-amp. This circuit was highlighted to me by Dominik but I still unable to understand the princible of operation regarding the voltages Vntail, Vncas1 and Vncas2.


sooch_biasing circuit.PNG


What I know is that:

Vtail = Vov+Vth
Vncas1= 2Vov+Vth
Vncas2 = 3Vov+Vth

But I dont know how it is coming or the setting to generate these voltages from this circuit.

Thank you in advance

Best Regards
 

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