Hello,
I've been designing a single stage receiver and my IF frequency is 350 Mhz. The IF filter I am using has a group delay of 1 µsec and the group delay variation is 85 nsec. Can you tell me is it a good performance or not? What is the criteria for selecting an IF filter (for the group delay)
Thanks...
A group delay ripple below 100ns is good for most of the commercial communication systems including WCDMA.
Is good to know that the group delay of a filter is proportional to its order and is inversely proportional to filter bandwidth (small percentage bandwidth filters have large group delay).