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The
Distributed Half Band Filter (DHBF) 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).
RFEL are also able to provide tailored Third Band filters, and Mth-band
filters for applications with specialised sample rate / IF requirements.
Basic
DHBF Structure
RF Engines proprietary techniques implement the DHBF architecture onto an FPGA device to optimise speed and silicon usage, depending on the customers design parameters.
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.
Features
:
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Proven
in Xilinx and Altera devices |
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Easy
migration to most FPGA Vendors devices and architectures. |
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Half
band filter can be specified for stop-band attenuation and filter
order. |
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Can
be used in critically-sampled or over-sampled systems |
| • |
Provides
a high performance front-end for the RF Engines PFT or FFT architectures. |
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Various
data input bit widths can be implemented |
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Fully
synchronous design. |
Applications
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Digital
Down Converter replacement |
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High
Speed front ends |
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