Biasing the transistors in the output stage of the op-amp

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Junus2012

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Hello all,

In the small signal condition, transistors M5-M10 of the folded cascoded amplifier shwon below have a current of Ib, but at the time of slewing they will handle a current of 2Ib

Questions:

1. Should I size these transistors according to Ib or 2Ib ?, do we still need these transistors to be in saturation in the time of slewing and why ?
2. Biasing voltage Vbp2 should be designed according to 2Ib or Ib

Thank you very much

Regards

folded.PNG
 

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