Other Parts Discussed in Thread: THS4551, , ADS9224R
We are looking for a design reference design or some concepts for a fully differential band pass filter using something like the THS4551 found on the ADS9224REVM-PDK board. The centre frequency needs to be moved in 500Khz blocks up and down from 0Hz to 10Mhz (or there about).
We have a simple application circuit that is a many turn antenna which we match via a transformer and feed into the THS4551 differential amplifiers on the ADS9224REVM-PDK board then take FFT results from the tools supplied which works great! What we want to do is make a band pass filter after the antenna and place it before the THS4551's and ADS9224 EVAL.
A simple band pass filter before we feed it into the eval board for testing / experimenting with some concepts we are working on to stop signals out of band having to much affect on our sampling. Something like 500Khz bandwidth with selections to cover 0-500Khz, 500Khz-1Mhz, 1Mhz to 1.5Mhz, 1.5Mhz to 2Mhz. The roll off does not have to be great, we just need a few dB attenuation outside our band that continues to roll off so things further out of band get more and more attenuation.
This is not the application, its just a simple way to test / describe the function we need. Any ideas / help / references?
