how to improve the dynamic range of a low pass gmC filter

[richaphy]

I have designed a low pass filter with OTA for very low cutoff.
However the filter comes out to have a very low dynamic range.
How may I can improve the dyanmic range of this OTA filter
One option could be increasing the size of capacitor, but it will increase the area of the filter.
Please help

 

[Audioguru]

You forgot to post your schematic and parts list.

 

[BradtheRad]

Is it a simple RC filter? Try to minimize ohmic resistance (ESR) in the same leg as the capacitor. This ESR might be inside the capacitor or it might be in components inline with the cap.

One option could be increasing the size of capacitor

Consider reducing its value, and increase the input resistance. The input resistance should be many times the ESR. Say, more than 10x. This reduces the effect of ESR. Your filter's dynamic range should improve.