Paul
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Hi,
1) I wouldn't say Q6 and Q7 form a push-pull stage. As both are PMOS devices, they form a source follower stage (Q7 is simply a current source). The goal basically is to replace the PMOS current source inthe output branch of a classical Miller-OTA by an active device, which improves the dynamic behavior.
2) For Q8 (NMOS), Vgs8=Va. For Q9 (PMOS), Vgs9=Va-Vgs6-Vdd (provided you consider PMOS Vgs values as negative). Can you provide us with the reference to this publication/book?
Paul
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