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Bandgap reference with OTA

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jc2

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1) I want to get a relation between the Vref variation due to the temperature variation and the OTA gain of the bandgap reference source shown in the figure.
Could I make a small signal analysis???

something like that:
vref=Av*vbe1+vptat*r1....

2) I saw, in simulations, a voltage variation between the input terminals of the OTA due to the temperature variation. How could I get a relation between this variation and the OTA gain?

thanks in advance

 

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