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I would like to design a digital LPF by using operational Amplifier at a span of 200MHz to 3000MHz. Is it possible? May I get application notes of such this circuit?
Operational amplifiers are linear amplifiers and are not digital devices. It would appear what you are looking for is a digital filter implemented using a DSP. However, I am not familiar with any that operate over the VHF to UHF ranges. It would seem that low-pass filter for 200 MHz to 3 GHz would use switched, conventional LC or SAW filters. But do note that is not our area of expertise here in Precision Amplifiers Applications.
Here is a TI Applications report on DSP filters. It would be best to contact the TI e2e forum that covers DSP products for additional assistance.
As Tom implies, active op amp filters in that range are not possible. We have seen folks driving banks of passive filters with different cutoffs into a part like the LMH6574 then pick of 1 of 4 possible channels to pass on their different input filters. There is a MPC or MPA version of this also I think.
