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Filter for Sigma Delta ADC (Gm-c or Mosfet-c or Ladder)

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abhishek_angadi

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Hi all,
I am new to IC design. I am designing a sigma delta modulator for a very low frequency application of 20 Hz(its a bio sensor so it needs to be low power also). Which is the best continuous time filter to use. ( ladder type, Gm-C or Mosfet-C ) or just a general amplifier with C in feedback.

Thanks in advance..

Abhishek
 

Is your modulator continuous?
Sharper the filter, more the consuming power!! You should specify your filter order (sharpness) according to your system specifications.
Anyway see this filter design book:
1999 - Deliyannis - Continuous Time Active Filter Design
 

Hi,
It is continuous and second order. Prof has asked me to get the best SNR and accuracy of 12 bits to start with.
Thanks
 

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