Min Cap value for SC filter

[rampat]

What is the min cap value that can be used in SC filter design,so that cap variation are negligible in 0.18u CMOS tech?

 

[naalald]

Hi,
It completely depends on the mismatch error that could be tolerated by the circuit and is defined by a graph which is related with the technology used. But remember that as the cap value decreases the mismatch error increases. So the minimum cap value is defined for a tolerable mismatch error. Here is the graph for the 0.18 process.

 

[lladnar23]

Also, your noise spec might determine this (kT/C)