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Can you give me some advice to increase the full scale input range of sigma delta AD or DA? Do you know some material or books about the topics? Thanks!
For the A/D you can simply use a good resistive divider, using tracking resistors.
For the D/A you can use an opamp to amplify the signal by the required ratio.
when in sigma-delta A/D, i think the full scale is equal to the difference of two feedback reference voltages, so you can increase these references to increase the input range.
of course, the increase of input voltage range is also dependent of the output swing of integrator, i.e. opamp's output swing, meanwhile it depends on integrator's gain.
btw, linearity should be considerated carefully when swing is increase, this will give rise to harmonic distortion.
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