INL of delta-sigma ADC

[xusoso]

i am studying a low frequency 14bit delta-sigma ADC, DNLis about 1lsb but INLis 10lsb. INL is too bad .
so my question is what factors will degrate the INL of delta-sigma ADC,and if there are some papers on this topic,please inform me ,thanks a lot.

 

[Vamsi Mocherla]

The INL might be coming from the mismatches in the integrators and in the comparators. Are you doing a resolution of more than 1 bit in the analog domain?

Added after 3 minutes:

Just check whether you are saturating the second integrator? If that is the case, tone down the signal amplitude to measure your INL

 

[akinkindi]

try using MATLAB to create a concept design and vary the factors to see how they affect the ADC performance..ann

 

[varvind]

yeah take the value of tau= [x2 +x1]