Understanding the SM-series Hardware | Signal Processing in the FPGA
Always-On Preselector Filters (SM435)
Frequency Range used for Sweeps
24000 – 34500
post-amp filters 24-27, 27-29.25, 29.25-31.25, 31.25-34.5 GHz
34500 – 43500
post-amp filters 34.5-37.25, 37.25-39.85, 39.85-43.5 GHz
3.3 Signal Processing in the FPGA
The digitized data is processed with a special FIR filter to reject the image response and flatten
the frequency response. This data is then digitally tuned to select the lower sideband, decimated
down to 250 MSPS I/Q, and distributed to several signal processing blocks within the FPGA.
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