This tracking receiver design uses the Pentek Model 6821 215 A/D converter VME board with 215 MHz max sampling. In particular, we use its 128 MB SDRAM to create a memory delay function. Samples from the A/D are sent into a circular buffer inside the SDRAM and also to an FFT IP core implemented in one of the two Virtex-II Pro FPGAs of the Model 6821. The spectral peaks of the FFT indicate the signals of interest present in the input signal that we want to track.
