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.
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