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Reducing the ICMR in opamp in a bandgap

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Chethan

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Hi all,
i am designing an BGR with an opamp.My opamp has an ICMR min of 1.2V.( 5V process with a Vth of 0.757V). I could reduce the ICMR to a minimum of only 1.02V. But the input voltage to both the inputs of the opamp is only 0.6V. Is there any means by which i can reduce the ICMR min to below 0.6 V in the same process?
I am using the following architecture........
 

Humungus

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Re: Opamp in a bandgap

I guess you are using a N-type input stage. If that's the case, use a P-type input stage. Another way could be to use p-type level shifters.
 

faninglee

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Re: Opamp in a bandgap

I think so, using p-type input stage can solve this question,and don`t add transistor.
 

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