10MHz bandpass filter

hi sir ,
i have a problem abort a 10MHz bandpass filter.
the parameters ;
BW>=3.5MHz, ripple<= 0.1dBa
retrun loss：-18dB
band rejection 55dBc@19.55MHz
group delay fluctuation 200ns

I think there may be a problem with the required BW and change in Gd allowed.
Is 3.5 MHz your max BW allowed?

This may be a solution:

ths for your solution，i had designed a similar circuit but the parameter of insertion loss can't achieve the target by board,so i have to use anther topology.
here is a best picture of waveform i had debugged.but ripple fluctuation >0.3dB.

ths for your solution，i had designed a similar circuit but the parameter of insertion loss can't achieve the target by board,so i have to use anther topology.
here is a best picture of waveform i had debugged.but ripple fluctuation >0.3dB.

the band ripple is too strict.it could hardly achieve the target on board.

There is an excelent tool for filter design avaliable at : http://www.nuhertz.com/


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