Active Bandpass Filter using op-amp
Kindly suggest your requirements. There are many opamps with bandwidth exceeding 2GHz
Yes. A LC filter is the cheaper and better performant solution nevertheless.
I require high selectivity filter. A bandwidth of 5MHz, passband insertion loss<= -10 dB, stopband attenuation at +-20MHz >=40dB. LC filter cannot provide these specifications. Another option is coaxial ceramic resonator filter. I am working on that topology but i need one prototype on urgent basis, if i can make one using op-amp or any kind of active topology. give me your suggestions..any active filter topology capable of meeting these requirements?
The specification involves a higher order filter, independent of the used technology.
In case of an active filter, filter Q is linked to required gain margin respectively excess GBW. I can't imagine that the filter can be easily implemented with available GHz OPs.
Equivalent circuit is the same LC only comparatively Q is better around 500-600. But with helix L it possible as well.