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single supply opamp design

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hacksgen

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single supply op amp design

Hi,

Any notes or reference for designing single supply based two stage miller opamps.In all cmos books the design examples are based on dual supplies.how do i go about designing it for single supplies.

thanks.
 

single supply op amp

Hello,

single or dual supply isn't the question, common-mode range counts. A simple standard two stage amplifier can't be input rail-to rail, you need two complementary input differential stages. E. g. Rahzavi describes it as Extension of input CM range.

Regards,
Frank
 

thanks for reply.the thing is the opamp should operate at 1.2 v supply. now the complementary input stage u suggest, i read in papers and books can be used for only above 1.5v supplies. So i dont understand how it can be used here.
 

I see. I guess rail-to-rail operation isn't possible then and common mode range is probably small, could be from ground to a few 100 mV above. Designs for this constraints couldn't be found in analog design textbooks, I believe.
 

Check the chapter on compensation in Gray
 

I recommend the book of Behzad Razavi
 

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