how can i decide the pnp's parameter in the ptat circuit?

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qqmz

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ptat circuit

the question is :

1. do the pmos worked in the saturate?
2. why did the Iptat not to change when i changed the M (the number of pnp)from 8 to 16 ?

thank you first!
 

ptat pnp

your feedback connection is wrong!
 

thank you arsenal, can you give me much more information?
 

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