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folded cascode op-amp design

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bharatsmile2007

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Hi everyone,
i am designing the Band gap reference in which it requres op-amp(i am using folded cascode op-amp). My VBG voltage is 1.25V.

My question is
1. How to decide/choose pmos tail current in opamp.
Folded cascode op-amp is given below.


2. And also how to size the folded current mirrors. means, is require any symmetry between upper pmos and lower nmos.

Thanks in advance.
bharat
 
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The design of my Masters project operational amplifier is uploaded here. I have a gain of 71 db, PM of 45, and bandwidth of 700Mhz.

**broken link removed**
 
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