Help me design an analog anti-aliasing LP filter

[anju420]

Hi, i want to design an analog anti aliasing LP filter (simple RC) to cut off freq beyond 20Hz...its to be implemented before i five an input signal to an ADC-AD7823..how do i design it?

 

[steve.hunch]

Re: analog filter design

I am not sure I understand the question correctly, but better way will be to put RC passive filter and a opamp - as buffer between RC and ADC(if needed also a buffer before RC).