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FPGA filter - DHBF
The Distributed Half Band Filter is a 'down-convert and decimate' filter, primarily intended for use as the first stage in very high sample rate DSP systems. Data is presented at the DHBF input from a high speed sampling system (typically an A to D and anti-aliasing filter) and the input signal is down-converted to base-band with the frequency range +/- fs/4 (where fs is the input sample rate).Proprietary techniques implement this distributed architecture onto an FPGA device to optimise speed and silicon usage.
Half Band Filter characteristics can be specified over a wide range with regard to side-lobe (stop-band) level and filter order.
Higher order (sharper) filters will typically increase silicon usage, but the flexible architecture of the DHBF will minimise silicon usage for implementation.
With a complex output as standard, the core can be used to convert from real data to complex.