Designing of digital filter

[Pavan kumar CR]

Dear All,

I need to design a digital filter and i've only following specification

1) The signal bandwidth is 5 MHz
2) The input signal is sampled @ 7.86 MHz

Kindly suggest how to derive cutoff frequency to this filter.

Thanks and regards.
Pavan

 

[FvM]

Condition 1+2 contradict the Nyquist criterion.

 

[Pavan kumar CR]

Thanks for replying....
kindly explain in detail so that i can take necessary precaution before designing

 

[FvM]

According to Nyquist criterion, the maximum input signal frequency component and also characteristic filter frequency must be below fs/2, presuming a baseband design.